Plant ReproductionPub Date : 2024-09-01Epub Date: 2024-01-31DOI: 10.1007/s00497-024-00495-w
Raquel Figueiredo, Mónica Costa, Diana Moreira, Miguel Moreira, Jennifer Noble, Luís Gustavo Pereira, Paula Melo, Ravishankar Palanivelu, Sílvia Coimbra, Ana Marta Pereira
{"title":"JAGGER localization and function are dependent on GPI anchor addition.","authors":"Raquel Figueiredo, Mónica Costa, Diana Moreira, Miguel Moreira, Jennifer Noble, Luís Gustavo Pereira, Paula Melo, Ravishankar Palanivelu, Sílvia Coimbra, Ana Marta Pereira","doi":"10.1007/s00497-024-00495-w","DOIUrl":"10.1007/s00497-024-00495-w","url":null,"abstract":"<p><strong>Key message: </strong>GPI anchor addition is important for JAGGER localization and in vivo function. Loss of correct GPI anchor addition in JAGGER, negatively affects its localization and function. In flowering plants, successful double fertilization requires the correct delivery of two sperm cells to the female gametophyte inside the ovule. The delivery of a single pair of sperm cells is achieved by the entrance of a single pollen tube into one female gametophyte. To prevent polyspermy, Arabidopsis ovules avoid the attraction of multiple pollen tubes to one ovule-polytubey block. In Arabidopsis jagger mutants, a significant number of ovules attract more than one pollen tube to an ovule due to an impairment in synergid degeneration. JAGGER encodes a putative arabinogalactan protein which is predicted to be anchored to the plasma membrane by a glycosylphosphatidylinositol (GPI) anchor. Here, we show that JAGGER fused to citrine yellow fluorescent protein (JAGGER-cYFP) is functional and localizes mostly to the periphery of ovule integuments and transmitting tract cells. We further investigated the importance of GPI-anchor addition domains for JAGGER localization and function. Different JAGGER proteins with deletions in predicted ω-site regions and GPI attachment signal domain, expected to compromise the addition of the GPI anchor, led to disruption of JAGGER localization in the cell periphery. All JAGGER proteins with disrupted localization were also not able to rescue the polytubey phenotype, pointing to the importance of GPI-anchor addition to in vivo function of the JAGGER protein.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"341-353"},"PeriodicalIF":2.9,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11377618/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139643318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-09-01Epub Date: 2023-11-15DOI: 10.1007/s00497-023-00486-3
Yuan Yao, Wenhui Fu, Yue Yu, Suyan Wan, Wenping Zhang, Ray Ming
{"title":"The synthesis of papaya fruit flavor-related linalool was regulated by CpTPS18 and CpNAC56.","authors":"Yuan Yao, Wenhui Fu, Yue Yu, Suyan Wan, Wenping Zhang, Ray Ming","doi":"10.1007/s00497-023-00486-3","DOIUrl":"10.1007/s00497-023-00486-3","url":null,"abstract":"<p><p>Papaya is a tropical fruit crop renowned for its rich nutrition, particularly pro-vitamin A. Aroma substances are a major component of fruit quality. While extensive research has been conducted on papaya aroma, there has been a notable lack of in-depth research into a specific class of substances. To bridge this gap, our study focused on analyzing the aroma components of various papaya varieties and their biosynthesis pathways. We compared the volatile components of three papaya varieties with distinct flavors at various ripeness stages. A continuous accumulation of linalool, a volatile compound, in the 'AU9' fruit was detected as it matured. The linalool content reached 56% of the total volatile components upon full ripening. Notably, this percentage was significantly higher than that observed in the other two varieties, 'ZhongBai' and 'Malaysian 7', indicating that linalool serves as the primary component influencing the papaya's odor. Subsequently, we identified CpTPS18, a gene associated with linalool biosynthesis, and demonstrated its ability to catalyze linalool production from GPP and enhance its accumulation through overexpression in papaya fruits, both in vivo and in vitro. Based on transcriptomic analysis, it was predicted that CpMYB56 and CpNAC56 may transcriptionally activate the expression of CpTPS18. Subsequent yeast one-hybrid assay and dual luciferase analysis revealed that CpNAC56 activates the transcription of CpTPS18. Transient overexpression in vivo demonstrated that this gene could upregulate the expression of CpTPS18 and promote linalool accumulation. These results uncovered the primary volatile molecule responsible for papaya fruit odor and identified two major genes influencing its biosynthesis. The genomic resources and information obtained from this study will expedite papaya improvement for fruit quality.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"295-308"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"107592771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-09-01Epub Date: 2023-12-01DOI: 10.1007/s00497-023-00488-1
Stuart R Macgregor, Paula K S Beronilla, Daphne R Goring
{"title":"The Arabidopsis SNARE complex genes regulate the early stages of pollen-stigma interactions.","authors":"Stuart R Macgregor, Paula K S Beronilla, Daphne R Goring","doi":"10.1007/s00497-023-00488-1","DOIUrl":"10.1007/s00497-023-00488-1","url":null,"abstract":"<p><strong>Key message: </strong>The VAMP721, VAMP722, SYP121, SYP122 and SNAP33 SNAREs are required in the Arabidopsis stigma for pollen hydration, further supporting a role for vesicle trafficking in the stigma's pollen responses. In the Brassicaceae, the process of accepting compatible pollen is a key step in successful reproduction and highly regulated following interactions between the pollen and the stigma. Central to this is the initiation of secretion in the stigma, which is proposed to provide resources to the pollen for hydration and germination and pollen tube growth. Previously, the eight exocyst subunit genes were shown to be required in the Arabidopsis stigma to support these pollen responses. One of the roles of the exocyst is to tether secretory vesicles at the plasma membrane for membrane fusion by the SNARE complex to enable vesicle cargo release. Here, we investigate the role of Arabidopsis SNARE genes in the stigma for pollen responses. Using a combination of different knockout and knockdown SNARE mutant lines, we show that VAMP721, VAMP722, SYP121, SYP122 and SNAP33 are involved in this process. Significant disruptions in pollen hydration were observed following pollination of wildtype pollen on the mutant SNARE stigmas. Overall, these results place the Arabidopsis SNARE complex as a contributor in the stigma for pollen responses and reaffirm the significance of secretion in the stigma to support the pollen-stigma interactions.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"309-320"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138464266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-09-01Epub Date: 2024-02-13DOI: 10.1007/s00497-024-00498-7
Sung-Aeong Oh, Soon Ki Park
{"title":"Ectopic expression of a thaumatin-like protein impairs the timely deposition and dissolution of callose during microsporogenesis, leading to microspore death and male sterility in Arabidopsis.","authors":"Sung-Aeong Oh, Soon Ki Park","doi":"10.1007/s00497-024-00498-7","DOIUrl":"10.1007/s00497-024-00498-7","url":null,"abstract":"<p><strong>Key message: </strong>Two pollen-preferential thaumatin-like proteins show both common and distinctive expression profiles. Precocious expression of one of them drastically disturbs timely deposition and dissolution of callose during microsporogenesis, leading to microspore death. Thaumatin-like proteins (TLPs), members of the pathogenesis-related protein family 5 (PR-5), are involved in plant defenses against biotic and abiotic stresses through antifungal activity and enhanced tolerance. Accordingly, studies on TLPs have focused on their responses to various pathogens and stresses and on engineering agronomically valuable crops that can be cultivated in suboptimal environments. On the other hand, the role of TLP members in plant development and their genetic regulation remains largely unexplored. Recently, we reported that the generative cell internalization after pollen mitosis I, an essential pollen patterning step for the nonmotile sperm cell delivery through a pollen tube, depends on STICKY GENERATIVE CELL which suppresses callose deposition in the nascent generative cell and interacts with a germline cell preferential GCTLP1 in Arabidopsis. Here, we additionally identified GCTLP2 which is similarly expressed in the germline cells. We generated various transgenic lines and examined their expressions and phenotypes to elucidate GCTLP functions during pollen development. Expression profiles suggest two GCTLP proteins may have common but also distinctive roles during pollen development. Importantly, ectopic expression analyses show that precocious expression of GCTLP2 severely disturbs the timely deposition and degradation of callose during microsporogenesis which is essential to produce viable microspores. Therefore, our study broadens the knowledge of TLP function and callose regulation for successful pollen development in Arabidopsis.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"365-378"},"PeriodicalIF":2.6,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139730991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2023-05-09DOI: 10.1007/s00497-023-00464-9
Bruno Rafael Alves Rodrigues, Charles S Gasser, Samy Pimenta, Marlon Cristian Toledo Pereira, Silvia Nietsche
{"title":"Seedless fruit in Annona squamosa L. is monogenic and conferred by INO locus deletion in multiple accessions.","authors":"Bruno Rafael Alves Rodrigues, Charles S Gasser, Samy Pimenta, Marlon Cristian Toledo Pereira, Silvia Nietsche","doi":"10.1007/s00497-023-00464-9","DOIUrl":"10.1007/s00497-023-00464-9","url":null,"abstract":"<p><strong>Key message: </strong>Inheritance of the presence/absence of seeds in Annona squamosa is mediated by a single fully recessive gene and is caused by a deletion of the INNER NO OUTER (INO) locus. For some fruits, seedless varieties are desirable for consumption and processing. In the sugar apple tree (Annona squamosa L.), the seedless trait in the Thai seedless (Ts) and Brazilian seedless (Bs) accessions was associated with defective ovules and an apparent deletion of the INNER NO OUTER (INO) ovule development gene locus. Segregation analysis of F<sub>2</sub> and backcross descendants of crosses of Bs to fertile wild-type varieties in this species with a multi-year generation time showed that seedlessness was recessive and controlled by a single locus. Comparison of whole genome sequence of a wild-type plant and a third accession, Hawaiian seedless (Hs), identified a 16 kilobase deletion including INO in this line. Ts and Bs lines were shown to have an identical deletion, indicating a common origin from a single deletion event. Analysis of microsatellite markers could not preclude the possibility that all three seedless accessions are vegetatively propagated clones. The sequence of the deletion site enabled a codominant assay for the wild-type and mutant genes allowing observation of complete cosegregation of the seedless/defective ovule phenotype with the INO deletion, showing maximal separation of less than 3.5 cM. The observed deletion is the only significant difference between the wild-type and Hs line over 587 kilobases, likely encompassing much more than 3.5 cM, showing that the deletion is the cause of seedless trait. The codominant markers and obtained progenies will be useful for introgression of the seedless trait into elite sugar apple lines and into other Annonas through interspecific crossings.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"71-84"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11180160/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9432324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2023-03-20DOI: 10.1007/s00497-023-00461-y
Natalia E Delbón, Nayla L Aliscioni, Marina Lorenzati, Sergio García, Rodrigo B Singer, Diego E Gurvich
{"title":"Looking for non-hermaphrodite cacti: multidisciplinary studies in Gymnocalycium bruchii endemic to central Argentina.","authors":"Natalia E Delbón, Nayla L Aliscioni, Marina Lorenzati, Sergio García, Rodrigo B Singer, Diego E Gurvich","doi":"10.1007/s00497-023-00461-y","DOIUrl":"10.1007/s00497-023-00461-y","url":null,"abstract":"<p><strong>Key message: </strong>Through a multidisciplinary study we found that Gymnocalycium bruchii, an endemic cactus from central Argentina, acts as a dioecious species, which is the first record in this genus. Cactaceae species are typically hermaphroditic; however, about 2% have other different reproductive systems. These non-hermaphroditic species may develop sexual dimorphism in flowers or other reproductive, vegetative or ecological traits, besides a specific breeding system and floral ontogeny. Therefore, multidisciplinary research is necessary to fully understand reproduction in those species. For this purpose, we studied Gymnocalicium bruchii, a globose cactus endemic to central Argentina that is presumably dioecious or gynodioecious. We made observations in two natural and two cultivated populations. We made morphological observations of plants and flowers, and performed quantitative analyses to determine the sex ratio, size of plants and flowers, flower production, fruiting, among other variables. We performed hand-pollination, self-fertilization and free-pollination tests to determine the breeding system. Finally, we studied the anatomy and ontogeny of the reproductive organs using permanent histological slides of flower morphs at different stages. Our results confirm that Gymnocalicium bruchii is a dioecious species. Female flowers have atrophied anthers and a functional gynoecium that produces fruits and seeds. Male flowers are bigger and have a functional androecium but a sterile gynoecium. In the cultivated population, the sex ratio was 1/1, whereas the number of male individuals was higher in both natural populations. Pollination tests corroborated dioecy. Ontogenetic studies revealed that in female flowers the anthers collapse before microspore maturation, while in male flowers the gynoecium shows normal development of the ovary, style, stigma, and ovules; however, the latter are never fertilized.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"201-214"},"PeriodicalIF":2.6,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9513143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2023-11-15DOI: 10.1007/s00497-023-00485-4
Cristina Guerrero-Méndez, María Jazmín Abraham-Juárez
{"title":"Factors specifying sex determination in maize.","authors":"Cristina Guerrero-Méndez, María Jazmín Abraham-Juárez","doi":"10.1007/s00497-023-00485-4","DOIUrl":"10.1007/s00497-023-00485-4","url":null,"abstract":"<p><p>Plant architecture is an important feature for agronomic performance in crops. In maize, which is a monoecious plant, separation of floral organs to produce specific gametes has been studied from different perspectives including genetic, biochemical and physiological. Maize mutants affected in floral organ development have been key to identifying genes, hormones and other factors like miRNAs important for sex determination. In this review, we describe floral organ formation in maize, representative mutants and genes identified with a function in establishing sexual identity either classified as feminizing or masculinizing, and its relationship with hormones associated with sexual organ identity as jasmonic acid, brassinosteroid and gibberellin. Finally, we discuss the challenges and scopes of future research in maize sex determination.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"171-178"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11180155/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"107592770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2024-01-09DOI: 10.1007/s00497-023-00494-3
Cristian Genaro Ramírez-Castro, Alma Piñeyro-Nelson, Estela Sandoval-Zapotitla, Salvador Arias, Isaura Rosas-Reinhold
{"title":"Comparative analysis of floral transition and floral organ formation in two contrasting species: Disocactus speciosus and D. eichlamii (Cactaceae).","authors":"Cristian Genaro Ramírez-Castro, Alma Piñeyro-Nelson, Estela Sandoval-Zapotitla, Salvador Arias, Isaura Rosas-Reinhold","doi":"10.1007/s00497-023-00494-3","DOIUrl":"10.1007/s00497-023-00494-3","url":null,"abstract":"<p><strong>Key message: </strong>Contrasting morphologies in Disocactus are the result of differential development of the vegetative and floral tissue where intercalary growth is involved, resulting in a complex structure, the floral axis. Species from the Cactaceae bear adaptations related with their growth in environments under hydric stress. These adaptations have translated into the reduction and modification of various structures such as leaves, stems, lateral branches, roots and the structuring of flowers in a so-called flower-shoot. While cacti flowers and fruits have a consistent structure with showy hermaphrodite or unisexual flowers that produce a fruit called cactidium, the developmental dynamics of vegetative and reproductive tissues comprising the reproductive unit have only been inferred through the analysis of pre-anthetic buds. Here we present a comparative analysis of two developmental series covering the early stages of flower formation and organ differentiation in Disocactus speciosus and Disocactus eichlamii, which have contrasting floral morphologies. We observe that within the areole, a shoot apical meristem commences to grow upward, producing lateral leaves with a spiral arrangement, rapidly transitioning to a floral meristem. The floral meristem produces tepal primordia and a staminal ring meristem from which numerous or few stamens develop in a centrifugal manner in D. speciosus and D. eichlamii, respectively. Also, the inferior ovary derives from the floral meristem flattening and an upward growth of the surrounding tissue of the underlying stem, producing the pericarpel. This structure is novel to cacti and lacks a clear anatomical delimitation with the carpel wall. Here, we present a first study that documents the early processes taking place during initial meristem determination related to pericarpel development and early floral organ formation in cacti until the establishment of mature floral organs.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"179-200"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11180016/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139405168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2024-01-29DOI: 10.1007/s00497-023-00493-4
Judith Jazmin Bernal-Gallardo, Karla L González-Aguilera, Stefan de Folter
{"title":"EXPANSIN15 is involved in flower and fruit development in Arabidopsis.","authors":"Judith Jazmin Bernal-Gallardo, Karla L González-Aguilera, Stefan de Folter","doi":"10.1007/s00497-023-00493-4","DOIUrl":"10.1007/s00497-023-00493-4","url":null,"abstract":"<p><strong>Key message: </strong>EXPANSIN15 is involved in petal cell morphology and size, the fusion of the medial tissues in the gynoecium and expansion of fruit valve cells. It genetically interacts with SPATULA and FRUITFULL. Cell expansion is fundamental for the formation of plant tissues and organs, contributing to their final shape and size during development. To better understand this process in flower and fruit development, we have studied the EXPANSIN15 (EXPA15) gene, which showed expression in petals and in the gynoecium. By analyzing expa15 mutant alleles, we found that EXPA15 is involved in petal shape and size determination, by affecting cell morphology and number. EXPA15 also has a function in fruit size, by affecting cell size and number. Furthermore, EXPA15 promotes fusion of the medial tissues in the gynoecium. In addition, we observed genetic interactions with the transcription factors SPATULA (SPT) and FRUITFULL (FUL) in gynoecium medial tissue fusion, style and stigma development and fruit development in Arabidopsis. These findings contribute to the importance of EXPANSINS in floral and fruit development in Arabidopsis.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"259-270"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11180156/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139571757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Plant ReproductionPub Date : 2024-06-01Epub Date: 2023-10-12DOI: 10.1007/s00497-023-00482-7
Yesenia Madrigal, Juan F Alzate, Natalia Pabón-Mora
{"title":"Evolution of major flowering pathway integrators in Orchidaceae.","authors":"Yesenia Madrigal, Juan F Alzate, Natalia Pabón-Mora","doi":"10.1007/s00497-023-00482-7","DOIUrl":"10.1007/s00497-023-00482-7","url":null,"abstract":"<p><p>The Orchidaceae is a mega-diverse plant family with ca. 29,000 species with a large variety of life forms that can colonize transitory habitats. Despite this diversity, little is known about their flowering integrators in response to specific environmental factors. During the reproductive transition in flowering plants a vegetative apical meristem (SAM) transforms into an inflorescence meristem (IM) that forms bracts and flowers. In model grasses, like rice, a flowering genetic regulatory network (FGRN) controlling reproductive transitions has been identified, but little is known in the Orchidaceae. In order to analyze the players of the FRGN in orchids, we performed comprehensive phylogenetic analyses of CONSTANS-like/CONSTANS-like 4 (COL/COL4), FLOWERING LOCUS D (FD), FLOWERING LOCUS C/FRUITFULL (FLC/FUL) and SUPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1) gene lineages. In addition to PEBP and AGL24/SVP genes previously analyzed, here we identify an increase of orchid homologs belonging to COL4, and FUL gene lineages in comparison with other monocots, including grasses, due to orchid-specific gene lineage duplications. Contrariwise, local duplications in Orchidaceae are less frequent in the COL, FD and SOC1 gene lineages, which points to a retention of key functions under strong purifying selection in essential signaling factors. We also identified changes in the protein sequences after such duplications, variation in the evolutionary rates of resulting paralogous clades and targeted expression of isolated homologs in different orchids. Interestingly, vernalization-response genes like VERNALIZATION1 (VRN1) and FLOWERING LOCUS C (FLC) are completely lacking in orchids, or alternatively are reduced in number, as is the case of VERNALIZATION2/GHD7 (VRN2). Our findings point to non-canonical factors sensing temperature changes in orchids during reproductive transition. Expression data of key factors gathered from Elleanthus auratiacus, a terrestrial orchid in high Andean mountains allow us to characterize which copies are actually active during flowering. Altogether, our data lays down a comprehensive framework to assess gene function of a restricted number of homologs identified more likely playing key roles during the flowering transition, and the changes of the FGRN in neotropical orchids in comparison with temperate grasses.</p>","PeriodicalId":51297,"journal":{"name":"Plant Reproduction","volume":" ","pages":"85-109"},"PeriodicalIF":2.9,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11180029/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41219715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}