Isabella Cristina Santos Egito, Angelica Rodrigues Alves, Ian Carlos Bispo Carvalho, Luciellen Costa Ferreira, Maurício Rossato
{"title":"Specific colorimetric LAMP assay for the detection of maize bushy stunt phytoplasma in corn through comparative genomics","authors":"Isabella Cristina Santos Egito, Angelica Rodrigues Alves, Ian Carlos Bispo Carvalho, Luciellen Costa Ferreira, Maurício Rossato","doi":"10.1007/s40858-024-00638-4","DOIUrl":"https://doi.org/10.1007/s40858-024-00638-4","url":null,"abstract":"<p>Brazil stands out as the third largest corn producer in the world, showing self-sufficiency to supply its entire national demand. However, maize red stunt, caused by maize bushy stunt phytoplasma (MBSP), is one of the most harmful diseases to this crop, requiring fast and accurate detection methods to deal with this threat. One such method is loop-mediated isothermal amplification (LAMP), a fast, sensitive, and highly specificity tool that can be used in field analysis. From this perspective, this study aimed to develop a LAMP protocol through comparative genomics for MBSP in maize. To design the sets of primers, the MBSP genome sequence and sequences of other pathogens were used in the RUCS software (Rapid identification of PCR primers for Unique Core Sequences) to select only core unique sequences. Three sets of primers had the desired criteria and were synthetized. The most promising primer set, MBSP-LP, was used to test the LAMP assay together with the Warmstart colorimetric LAMP 2X master mix (NEB) Kit. The reaction optimization uses a 4:1 proportion of primers and a temperature of 65 °C for 60 minutes. The collection of 51 samples of corn with and without symptoms was tested with a typical nested-PCR and compared with the proposed LAMP assay. Considering the presence and absence of symptoms, there was confirmation that the symptomatic plants were positive for LAMP in a greater proportion than for nested-PCR. The proposed LAMP assay proved to be sensitive, detecting up to 0.1 fg µL<sup>-1</sup> of DNA. The use of plant material directly in the reaction was evaluated for the presence of any inhibitors of the reaction. It was identified that there are no inhibitors in the maize plant tissue, and this LAMP assay can be used without the DNA extraction step.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139987739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yefoungnigui Souleymane Yeo, Yassogui Kone, Dio Dramane Dembele, Elisee Ler-N’Ogn Dadee Georges Amari, Jean-Yves Rey, Emerson Medeiros Del Ponte, Diana Fernandez, Daouda Kone
{"title":"Prevalence of mango stem-end rot disease in Côte d'Ivoire and identification of associated fungal pathogens","authors":"Yefoungnigui Souleymane Yeo, Yassogui Kone, Dio Dramane Dembele, Elisee Ler-N’Ogn Dadee Georges Amari, Jean-Yves Rey, Emerson Medeiros Del Ponte, Diana Fernandez, Daouda Kone","doi":"10.1007/s40858-024-00636-6","DOIUrl":"https://doi.org/10.1007/s40858-024-00636-6","url":null,"abstract":"<p>The Stem-end rot (SER) postharvest disease of mango (<i>Mangifera indica</i> L.) fruits is a significant economic threat to mango production. Without proper management strategies, it can lead to up to 100 % postharvest losses. Despite its importance, very little information is known about this disease in Côte d'Ivoire. This research aimed to determine the incidence and severity of SER in mango orchards, assess how preharvest climate parameters affect the disease and determine the pathogenic fungi associated with SER. Mango SER was evaluated on 1500 mango fruits collected from 15 orchards in Boundiali, Ferkéssédougou, Korhogo, Odienné, and Sinématiali departments. Mango SER incidence ranged from 10 % to 30 %, while severity ranged from 5 % to 20 %. No significant differences in these parameters were observed between the different departments (<i>P</i>>0.05). The study also revealed a positive low correlation between SER disease incidence and mean air temperature (<i>r</i> = 0.36) and minimum air temperature (<i>r</i> = 0.26) data, indicating that preharvest weather conditions may have a marginal impact on mango SER disease intensity in the postharvest phase. Pathogenic fungi associated with SER were isolated and identified using morphological characteristics and multilocus sequence analysis of the rDNA internal transcribed spacer (ITS) region and the translation elongation factor 1-alpha (<i>tef1-α</i>). Various fungal species associated with mango SER disease were also identified, with <i>Lasiodiplodia</i> species (74%) being the most prevalent (including <i>Lasiodiplodia theobromae, L. euphorbicola</i>, and <i>L. caatinguensis</i>), followed by <i>Colletotrichum gloeosporioides</i>, <i>Curvularia pseudobrachyspora</i>, <i>Diaporthe endophytica</i> and <i>Fusarium mangiferae</i>. However, only <i>Lasiodiplodia</i> species and <i>Diaporthe endophytica</i> induced SER symptoms. This study was the first ever evaluation of mango SER disease and associated fungal pathogens identification in Côte d'Ivoire. This result will assist researchers in developing a control method for mango SER.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139981375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Characterization and evaluation of Bacillus altitudinis BS-4 as a novel potential biocontrol agent against Phytophthora sojae in soybean","authors":"Shun Cao, Fangxin Chen, Yuli Dai, Zhenyu Zhao, Bingxin Jiang, Yuemin Pan, Zhimou Gao","doi":"10.1007/s40858-024-00637-5","DOIUrl":"https://doi.org/10.1007/s40858-024-00637-5","url":null,"abstract":"<p>Soybean Phytophthora root rot (PRR) caused by <i>Phytophthora sojae</i> is one of the most devastating diseases of soybean worldwide. This study was conducted to develop new effective biocontrol agents for the control of the disease and explore the action mechanism<i>.</i> Eleven antagonistic bacterial strains against <i>P. sojae</i> were isolated from the soybean field soil samples, and among the strains, BS-4 not only had the strongest inhibitory activity against <i>P. sojae</i>, but also had good inhibition to other four species of oomycetes in <i>Phytophthora</i> and eight fungal pathogens. Based on 16S rDNA sequence analysis and the physiological and biochemical properties, the strain BS-4 was identified as <i>Bacillus altitudinis</i>. Strain BS-4 culture filtrate had significant inhibitory effects on the pathogens, and the inhibition rates were stronger than those in the dual culture. BS-4 filtrate kept a high bioactivity to <i>P. sojae</i> at a high temperature, even at 121℃, and in the pH range of 5 to 12. The germination of zoospores and the formation of sexual organs were seriously affected by BS-4 filtrate. Furthermore, detached leaf assays and greenhouse experiments showed that BS-4 suspension and culture filtrate all had good disease control efficacy, and in the field experiment, BS-4 suspension reduced the disease index and increased the biomass of soybean shoots and roots, significantly (<i>P</i> < 0.05), with control effect of 75.29% on PRR. It is suggested that <i>B. altitudinis</i> strain BS-4 is a novel potential biocontrol agent to control PRR, and will have a broad application prospect in PRR biocontrol.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139987565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zohreh Borjizad, Mehdi Mehrabi-Koushki, Reza Farokhinejad, Atena Safi, Man Mu, Marco Thines
{"title":"A new species of Bremia from the traditional crop Carthamus tinctorius from Iran","authors":"Zohreh Borjizad, Mehdi Mehrabi-Koushki, Reza Farokhinejad, Atena Safi, Man Mu, Marco Thines","doi":"10.1007/s40858-024-00640-w","DOIUrl":"https://doi.org/10.1007/s40858-024-00640-w","url":null,"abstract":"<p><i>Bremia</i> species cause downy mildew disease of Asteraceae, in particular in the subfamilies Cichorioideae and Carduoideae. The most notorious species is <i> B. lactucae</i>, which causes lettuce downy mildew. Previously, it was often assumed that this species causes disease on dozens of different host genera, but recent phylogenetic and morphological studies have shown that most species of <i>Bremia</i> are highly host specific and that <i> B. lactucae</i> might be mostly limited to <i>Lactuca sativa</i> and <i> L. serriola</i>. As a first step towards investigating the diversity of <i>Bremia</i> in Iran, ten fresh samples of downy mildew from <i>Carthamus tinctorius</i> and <i>Sonchus asper</i> were collected in 2017 to 2018 from various regions of Ahvaz in the southwest of Iran and subjected to morphological and molecular characterisation. Phylogenetic analyses based on <i>cox</i>2 sequences of mtDNA indicated that these samples represent two sister species of <i>Bremia</i>, <i>B. milovtzovae</i> sp. nov. and <i>B</i>. <i>sonchi</i>, causal agents of downy mildew on <i>C. tinctorius</i> and <i>S. asper</i>, respectively. Morphologically, <i>B. milovtzovae</i> sp. nov. can be readily distinguished from its sister species, <i>B. sonchi</i>, by more elongated conidia and shorter conidiophores.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139953783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Multilocus genotyping of sugarcane white leaf phytoplasma in Thailand","authors":"","doi":"10.1007/s40858-024-00635-7","DOIUrl":"https://doi.org/10.1007/s40858-024-00635-7","url":null,"abstract":"<h3>Abstract</h3> <p>One hundred and seventy-four symptomatic sugarcane samples infected with sugarcane white leaf (SCWL) phytoplasma were collected from sugarcane growing areas in ten provinces across the North, Northeastern and Central plain of Thailand. Genotyping was performed using 16S rRNA and ITS sequence and multilocus sequence typing (MLST) based on six genes including <em>tuf</em>, <em>secY</em>, <em>leuS</em>, <em>secA</em>, <em>AAA1</em> and <em>groES</em>. The 16S rRNA sequence analysis indicated that the SCWL phytoplasma population showed nucleotide sequence identity of 99.74% to 99.80% to ‘<em>Candidatus</em> Phytoplasma sacchari’. <em>In silico</em> RFLP analysis clustered the strains into 16SrXI-B and 16SrXI-D subgroups. Most strains (77%) were in the 16SrXI-D group, while 16SrXI-B strains were only found in the Northeastern regions. The 16SrXI-D group coexisted with the 16SrXI-B group in Roi Et, Kalasin, and Mookdahan provinces, but it was found alone in Surin province. Multilocal sequence typing showed genetic variations in six genes including <em>tuf</em>, <em>secY</em>, <em>leuS</em>, <em>secA</em>, <em>AAA1</em>, and <em>groES</em>. These variations resulted in the SCWL population being divided into two distinct groups, that are consistent with the 16SrXI subgroups. Additionally, five strains in this population exhibited recombinant DNA in the <em>tuf</em>, <em>secA</em>, <em>leuS</em>, <em>AAA1</em> and <em>groES</em> genes. This information about the genetic variability of SCWL phytoplasma in Thailand could be used to develop detection methods and monitoring strategies for the disease management.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139647727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Decoding peanut smut: A bibliometric analysis of two decades of research progress","authors":"","doi":"10.1007/s40858-023-00634-0","DOIUrl":"https://doi.org/10.1007/s40858-023-00634-0","url":null,"abstract":"<h3>Abstract</h3> <p>Since its first detection in commercial peanut fields in 1995, both the prevalence and impact on yield of peanut smut disease, caused by the fungus <em>Thecaphora frezzii</em>, have increased significantly. Concurrently, diverse research groups have investigated the disease through various methodologies, enhancing our scientific knowledge base. This study was designed to collate and analyze the literature on peanut smut comprehensively, presenting a detailed scientometric analysis that traces the trajectory of research from the beginning to the current state. To achieve this goal, bibliographic data about the disease was compiled, and metrics were calculated. The analysis revealed that a small proportion of the scientific output was published in peer-reviewed journals, with epidemiology and breeding being the predominant topics. Collaborative efforts played a pivotal role in advancing the study of this disease. The study also pinpointed the most prolific researchers, participating institutions, and the influence of the published work, alongside other trends. However, despite notable progress in peanut smut research, this progress is insufficiently reflected in peer-reviewed literature, posing a challenge for researchers within this domain. Continued studies are vital for the integrated management of peanut smut, to mitigate further yield losses and prevent the pathogen's spread into new production regions.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139518338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sabrina A. Cassol, Samuel A. Santos, Marston H. D. Franceschini, Flávia S. Alexandre, Davi M. Macedo, Chandan Pal, Emerson M. Del Ponte, Acelino C. Alfenas, Rafael F. Alfenas
{"title":"Are fungicides effective in protecting pruning wounds against Ceratocystis wilt on kiwifruit vines?","authors":"Sabrina A. Cassol, Samuel A. Santos, Marston H. D. Franceschini, Flávia S. Alexandre, Davi M. Macedo, Chandan Pal, Emerson M. Del Ponte, Acelino C. Alfenas, Rafael F. Alfenas","doi":"10.1007/s40858-023-00633-1","DOIUrl":"https://doi.org/10.1007/s40858-023-00633-1","url":null,"abstract":"<p>Ceratocystis wilt, caused by <i>Ceratocystis fimbriata</i>, is the primary disease affecting kiwifruit (<i>Actinidia spp.</i>) and a major constraint for its cultivation and expansion in Brazil. Additionally, the disease poses a threat to other major kiwifruit-producing countries, such as China, Chile, New Zealand, and Italy, where the disease has not been reported on kiwifruit vines yet. In kiwifruit vines, the infection generally initiates through the roots, but pruning wounds can also serve as an entry point for the pathogen. Currently, there is a dearth of proven effective strategies for controlling this disease, and there is no information on the effectiveness of fungicides for preventing <i>C. fimbriata</i> infection on kiwifruit. In the present study, we evaluated the efficacy of four fungicides: metalaxyl + mancozeb, boscalide + cresoxim-methyl, pyraclostrobin, and copper hydroxide, against <i>C. fimbriata</i> isolates. We found that metalaxyl + mancozeb and pyraclostrobin were the most effective in inhibiting mycelial growth <i>in vitro.</i> However, when evaluating these fungicides as pruning wound protectors in two kiwifruit cultivars, these fungicides were not effective, in the method tested. The results found in the <i>in vitro</i> assays can guide the development of chemical control of Ceratocystis wilt in kiwifruit. Furthermore, as none of the fungicides tested here were effective in protecting pruning wounds against <i>C. fimbriata</i> infection in kiwifruit vines, other active ingredients or application methods must be evaluated in upcoming studies.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139496080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Root and crown rot caused by oomycetes: an emerging threat to olive trees","authors":"Rachid Azenzem, Tayeb Koussa, Mohamed Najib Alfeddy","doi":"10.1007/s40858-023-00630-4","DOIUrl":"https://doi.org/10.1007/s40858-023-00630-4","url":null,"abstract":"<p>Soilborne diseases are an increasing threat to agriculture and natural ecosystems. Olive root and crown rot (ORCR) caused by pathogenic oomycete species has recently been reported in several olive-growing countries as an emerging phytopathological problem causing leaf yellowing, defoliation, twig dieback, and the development of wilting followed by decline of olive trees. Within the oomycetes, several <i>Phytophthora</i> and <i>Pythium</i> species have been reported to cause root and crown rot of cultivated and wild olive trees. Studies have shown that the disease is particularly severe in young olive groves located on poorly drained, occasionally waterlogged clay soils. Modernization of olive orchards induced by the introduction of irrigation, planting on more favourable and heavier soils, and intensification may increase the risk to cultivated olive trees. In addition, the potential for the spread of these oomycetes, as well as changes in precipitation patterns with more frequent heavy rains, would facilitate the development of infections in wild olive forests and olive groves. Therefore, this review summarizes the latest findings and advances regarding the causative agents of ORCR, detection and diagnosis tools, symptoms, disease cycle, epidemiology, and potential management strategies.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139495998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nima Khaledi, Leila Zare, Farshid Hassani, Saeed Osroosh
{"title":"Comparison of diagnostic methods, virulence and aggressiveness analysis of Pyrenophora spp. in pre-basic seeds in the barley fields","authors":"Nima Khaledi, Leila Zare, Farshid Hassani, Saeed Osroosh","doi":"10.1007/s40858-023-00631-3","DOIUrl":"https://doi.org/10.1007/s40858-023-00631-3","url":null,"abstract":"<p>Plant diseases caused by seed-borne pathogens cause yield and quality losses and threaten seed production of barley (<i>Hordeum vulgare</i> L.) and food security. The aim of this study was to compare common seed health methods for the diagnosis and detection of <i>Pyrenophora</i> species, and to investigate cell wall degrading enzymes (CWDEs), virulence and aggressiveness of the isolates obtained from pre-basic barley seed fields in Iran. Comparing common seed health methods showed that more fungal isolates were recovered from seeds using the agar plate method compared to freezing blotter, osmotic, embryo count, and seed washing tests. A total of 7 fungal species from 5 genera were identified from 30 different samples of various Iranian barley cultivars. Based on morphological and molecular characteristics, the fungi were identified as <i>Pyrenophora graminea</i>, <i>P. teres</i> f. <i>teres</i>, <i>P. teres</i> f. <i>maculata</i>, <i>Alternaria alternata</i>, <i>Fusarium culmorum</i>, <i>F. graminearum</i>, <i>Rhynchosporium commune</i> and <i>Ustilago nuda</i> f. sp. <i>hordei</i>. This study has shown that barley seed samples carry a wide diversity of fungi. The results showed that the 57 % of the total samples were found to be infected by seed-borne fungi. Among the genera, <i>Pyrenophora</i> was the most abundant fungus. Diverse levels of virulence and aggressiveness were observed for various isolates of <i>Pyrenophora</i> species. Analyzing the activity of CWDEs produced by isolates revealed that xylanase activity was more important than cellulase activity for the virulence of <i>Pyrenophora</i> isolates and enzyme activities affect levels of virulence and aggressiveness of isolates. Therefore, these findings suggest that activity levels of xylanase are correlated with variation in virulence and aggressiveness of <i>Pyrenophora</i> isolates on seedings. This is the first report identifying the seed-borne fungi of Iranian barley cultivars in pre-basic barley seed fields of Iran.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139460759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Race specific and non-specific resistance to Magnaporthe oryzae and QTL mapping in wild introgression lines using the standard differential system","authors":"Divya Balakrishnan, Yoshimichi Fukuta, Sarla Neelamraju","doi":"10.1007/s40858-023-00614-4","DOIUrl":"https://doi.org/10.1007/s40858-023-00614-4","url":null,"abstract":"<p>Blast disease caused by <i>Magnaporthe oryzae</i> is one of the major challenges to rice crop production worldwide. Wild and related species are potential source of novel alleles or genes for crop improvement especially for biotic stress resistance. This study was designed to characterize blast resistance in a set of wild introgression lines developed in the background of Indian mega rice variety Swarna. The introgression lines (INLs) under this study showed spectra of resistance across the different blast isolates inoculated. Monogenic differential varieties with known specific <i>Pi</i> genes and the susceptible checks were used in phenotyping. This study confirmed the usefulness of the differential system consisting of monogenic varieties and differential blast isolates for the systematic characterization of resistance in novel germplasm and to understand the genetic architecture of blast resistance. Twelve race specific quantitative trait loci (QTL) for partial resistance to disease were detected in these wild introgression lines from <i>O.nivara</i> using composite interval mapping. Of these, 10 were showing resistance to only one isolate each, while QTL detected in chromosome 3 showed resistance against isolates JPF514 and PHL16. While most of the QTLs mapped to previously reported defense related genes whereas two QTLs <i>qBL2.2</i> and <i>qBL5.1</i> between RM106—RM5460 and RM5140—RM289 with PVE% of 12.28 and 12.48 respectively are novel with no known blast resistance related genes reported within the locus. This study helps to provide developing the basis for future investigations on race specific or broad-spectrum resistance in rice and related crop species.</p>","PeriodicalId":23354,"journal":{"name":"Tropical Plant Pathology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139103091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}