Bragantia最新文献_第3页

Analytical approach to relate evapotranspiration, canopyatmosphere coupling level, and water deficit sensitivity 蒸散发、冠层-大气耦合水平和水分亏缺敏感性的分析方法

IF 1.2 4区农林科学

Bragantia Pub Date : 2023-03-20 DOI: 10.1590/1678-4499.20220198

Fabio Ernesto Martinez Maldonado, F. Marin

{"title":"Analytical approach to relate evapotranspiration, canopyatmosphere coupling level, and water deficit sensitivity","authors":"Fabio Ernesto Martinez Maldonado, F. Marin","doi":"10.1590/1678-4499.20220198","DOIUrl":"https://doi.org/10.1590/1678-4499.20220198","url":null,"abstract":"The decoupling factor (Ω) reflects the leading mechanisms responsible for canopy transpiration and allows to know the relevance of the control of stomatal or canopy conductance on transpiration (T). The Ω is strongly dependent on water availability and can be a good approach to describe how plants minimize excessive water loss by increasing the dominance of biotic factors that controls evapotranspiration under water deficit conditions. We provided an overview of how the Ω concept can be broadly used and applied for studying the sensitivity of evapotranspiration and water conservation potential of canopies under water deficit conditions. A decoupling condition indicates that, under water deficit, the increase of canopy resistance will not have control over the transpiration. Therefore, a structural context of the canopy in which predominantly uncoupled regions will have a lower capacity to reduce evapotranspiration and avoid water losses. Furthermore, because of the water deficit, stomatal closure restricts photosynthesis more than transpiration, and water use efficiency can be lower in decoupled canopies compared to more coupled ones. Yet, we summarized the characteristics that depict structural context predisposing coupled or decoupled conditions that can indicate the capacity of canopy/crop to reduce excessive water losses and maintain a high assimilation/transpiration relation under water deficit.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67479141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Sesuvium verrucosum Raf. Compost and vermicompost on the growth and production parameters of the Solanum lycopersicum L. crop 疣茸的作用。堆肥和蚯蚓堆肥对茄类作物生长和生产参数的影响

IF 1.2 4区农林科学

Bragantia Pub Date : 2023-03-20 DOI: 10.1590/1678-4499.20220162

M. A. Lastiri-Hernández, D. Álvarez-Bernal, Eloy Conde Barajas, R. Magallón, J. García, G. Cárdenas

{"title":"Effects of Sesuvium verrucosum Raf. Compost and vermicompost on the growth and production parameters of the Solanum lycopersicum L. crop","authors":"M. A. Lastiri-Hernández, D. Álvarez-Bernal, Eloy Conde Barajas, R. Magallón, J. García, G. Cárdenas","doi":"10.1590/1678-4499.20220162","DOIUrl":"https://doi.org/10.1590/1678-4499.20220162","url":null,"abstract":"The objectives of this work were to use Sesuvium verrucosum to produce stable and mature compost and vermicompost and to evaluate their influence on the growth and production parameters of the Solanum lycopersicum L. crop. For the preparation of vermicompost, the earthworm Eisenia fetida (Savigny) was used. The proposed treatments were: T1 (negative control) [no organic fertilizer + urea], T2 (positive control) [bovine manure (100%) + urea], T3 (compost) [bovine manure (100%) + urea], T4 (compost) [S. verrucosum (25%) + bovine manure (75%) + urea], T5 (compost) [S. verrucosum (50%) + bovine manure (50%) + urea], T6 (compost) [S. verrucosum (75%) + bovine manure (25%) + urea], T7 (vermicompost) [bovine manure (100%) + urea], and T8 (vermicompost) [S. verrucosum (25%) + bovine manure (75%) + urea]. The results showed that all the treatments were stable, mature and rich in nutrients after 140 days. In general, treatments made from S. verrucosum showed a high pH (7.97–8.45) and electrical conductivity (3.83–8.85 dS m-1). Nonetheless, excluding T7, the treatments made from a proportion of 25% halophyte and 75% bovine manure (T8 and T4) achieved the highest morphological parameters in the different variables that were evaluated, as well as the highest yields compared to controls T1 and T2, followed by T3, T5 and T6, respectively. Therefore, it was concluded that S. verrucosum can serve as a stable and mature organic amendment, rich in nutrients, and that can be used to improve the growth and development of the S. lycopersicum crop.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67479154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Distributional spectrum of bacterial wilt of chili incited by Ralstonia solanacearum in Pakistan 辣椒青枯病在巴基斯坦的分布谱

IF 1.2 4区农林科学

Bragantia Pub Date : 2023-03-20 DOI: 10.1590/1678-4499-2022-0196

Muhammad Naveed Aslam, T. Mukhtar

{"title":"Distributional spectrum of bacterial wilt of chili incited by Ralstonia solanacearum in Pakistan","authors":"Muhammad Naveed Aslam, T. Mukhtar","doi":"10.1590/1678-4499-2022-0196","DOIUrl":"https://doi.org/10.1590/1678-4499-2022-0196","url":null,"abstract":": The production of chili is seriously threatened by bacterial wilt incited by Ralstonia solanacearum in Pakistan. As the information about the distribution and prevalence of the disease and the pathogen is scarce, the present study was performed to ascertain the prevalence, occurrence and distribution of R. solanacearum in different regions of chili cultivation. The results showed differences in the incidence and prevalence of bacterial wilt all over the country. Overall, an incidence of 10% and prevalence of 76% of the disease was observed in the country. The highest incidence of bacterial wilt was observed in the province of Sindh whereas it was the lowest in Baluchistan. The prevalence of the disease followed the similar trend in the provinces. As regards agroecological zones, the highest incidence was recorded in Indus delta followed by sandy deserts whereas it was the lowest in western dry mountains. Almost the same tendency was observed regarding prevalence in the eight agroecological zones. In case of districts, the disease incidence was the maximum in Badin while it was the minimum in the district of Loralai. On the other hand, the disease prevalence was the maximum (100%) in the districts of Badin, Mirpurkhas, and Thatta and the minimum (60%) in the districts of Barkhan, Karak, and Loralai. Of the total 114 isolates of R. solanacearum , 81% were confirmed as Biovar 3 whereas the rest 19% isolates were identified as Biovar 4. The findings will help the farmers to design disease management programs accordingly to avert yield losses.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67483951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

TiO2 nanoparticles alleviates the effects of drought stress in tomato seedlings TiO2纳米颗粒减轻了番茄幼苗干旱胁迫的影响

IF 1.2 4区农林科学

Bragantia Pub Date : 2023-03-03 DOI: 10.1590/1678-4499.20220203

Sertan Çevik

{"title":"TiO2 nanoparticles alleviates the effects of drought stress in tomato seedlings","authors":"Sertan Çevik","doi":"10.1590/1678-4499.20220203","DOIUrl":"https://doi.org/10.1590/1678-4499.20220203","url":null,"abstract":": Nanoparticles have been widely used in recent years, to increase plant tolerance under stress conditions. In this study, TiO 2 nanoparticles (NPs) (100 ppm) were applied to tomato plants exposed to drought, and the changes were investigated by physiological, biochemical and proteomic methods. It was determined that TiO 2 NPs treatment increased the relative water content and decreased the proline and malondialdehyde content under drought conditions. As a result of proteomic analysis, it was revealed that the expression of a total of 132 proteins changed as a result of the comparison of the treatment groups (drought vs . control, control-100 vs . control, and drought-100 vs . drought). One of the most striking results of the study was the increase of the amounts of photosynthesis-related proteins and plasmamembrane intrinsic protein in both drought and control groups with TiO 2 NP-treatmtent. The up-regulation of plasmamembrane intrinsic protein is very important for preserving the water potential under drought conditions. Taken together, it was observed that the water potential of the plant was preserved, lipid peroxidation decreased under drought conditions with the application of TiO 2 nanoparticles, and the expression of proteins related to photosynthesis, energy and antioxidant system increased. This study provided clues to the molecular mechanism of the results of many studies available in the literature about nanoparticle treatment under stress condition and showed that TiO 2 nanoparticles have a great potential to be used to increase the stress tolerance of tomato plants under drought conditions.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67479455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Sample size for canonical correlation analysis in corn 玉米典型相关分析的样本量

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210335

A. Cargnelutti Filho, M. Toebe

{"title":"Sample size for canonical correlation analysis in corn","authors":"A. Cargnelutti Filho, M. Toebe","doi":"10.1590/1678-4499.20210335","DOIUrl":"https://doi.org/10.1590/1678-4499.20210335","url":null,"abstract":": The canonical correlation analysis has been successfully used in many areas aiming to extract important information from a pair of data sets. Thus, the objective of this work was to determine the sample size (number of plants) required to estimate the canonical correlations in corn characteristics. Six characteristics were measured in 361, 373, and 416 plants, respectively, of the single, three-way and double cross hybrids of the 2008/2009 crop year and in 1,777, 1,693, and 1,720 plants, respectively, of the single, three-way, and double cross hybrids (2009/2010 crop) (six cases). The canonical correlation analyses were carried out between characteristics group of the plant architecture (plant height at harvest and ear insertion height) versus grain production (hundred grains mass and grains mass per plant) (scenario 1), and dimensions of ear (ear length and ear diameter) versus grain production (hundred grains mass and grains mass per plant) (scenario 2). The sample size (number of plants) for the estimation of canonical correlations was determined by resampling with replacement and application of the model linear response with plateau. Measuring 270 plants is sufficient to estimate the canonical correlation between groups with two characteristics in each group for corn. This sample size can be used as reference for reliable canonical correlation analysis.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67478076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soil organic matter fractions in an Oxisol under tillage systems and winter cover crops for 26 years in the Brazilian subtropics 巴西亚热带地区26年耕作制度和冬季覆盖作物下Oxisol土壤有机质组分

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210352

Caroline Amadori, P. C. Conceição, C. A. Casali, L.B.S. Canalli, A. Calegari, J. Dieckow

{"title":"Soil organic matter fractions in an Oxisol under tillage systems and winter cover crops for 26 years in the Brazilian subtropics","authors":"Caroline Amadori, P. C. Conceição, C. A. Casali, L.B.S. Canalli, A. Calegari, J. Dieckow","doi":"10.1590/1678-4499.20210352","DOIUrl":"https://doi.org/10.1590/1678-4499.20210352","url":null,"abstract":": The improvement of carbon (C) accumulation in soils has been one of the main purposes of the conservation systems in agricultural production. This study aimed to assess the long-term effect of conventional tillage (CT) and no-tillage (NT) combined with winter cover crops, black oat and oilseed radish, and fallow on C accumulation and stabilization in a very clayey Oxisol in Southern Brazil. Soil samples were collected in the 0-0.05, 0.05-0.10 and 0.10-0.20 m layers of a 26-year-old experiment. Distribution of size-class aggregates, C stock in aggregates, total C stock, and C stocks in the physical fractions, free particulate organic matter (free-POM), occluded particulate organic matter (occluded-POM) and mineral-associated organic matter (min-OM) were assessed. NT had a higher percentage of macroaggregates and C stock in this size-class, and also higher C stock in bulk soil, free-POM and occluded-POM fractions than CT in 0-0.05 m (Tukey’s test p < 0.05), due to higher input of biomass and minimum soil mobilization in NT. Oat and radish had higher C stock in macroaggregates than fallow in 0.05-0.10 m (Tukey’s test p < 0.05). Radish had the highest C stock in the free-POM (0-0.05 m). Fallow decreased the stabilization of macroaggregates and C accumulation in free-POM, due to the lower C input from aboveground biomass over the years. In conclusion, NT after 26 years improved C accumulation and stabilization, mainly in the superficial layer and in POM fractions, and winter cover crops favored the formation and stability of macroaggregates.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67478220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Genetic diversity and selection of heirloom tomato accessions based on the physical and biochemical fruit-related traits 基于果实相关物理生化性状的番茄传家宝遗传多样性与选择

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210193

L. Constantino, G. D. Shimizu, Rafael Macera, Aida Satie Suzuki Fukuji, D. Zeffa, A. Koltun, L. Gonçalves

{"title":"Genetic diversity and selection of heirloom tomato accessions based on the physical and biochemical fruit-related traits","authors":"L. Constantino, G. D. Shimizu, Rafael Macera, Aida Satie Suzuki Fukuji, D. Zeffa, A. Koltun, L. Gonçalves","doi":"10.1590/1678-4499.20210193","DOIUrl":"https://doi.org/10.1590/1678-4499.20210193","url":null,"abstract":": Heirloom tomatoes are open-pollinated varieties bearing a wide diversity of colors and shapes that may be used by breeders aiming to improve physical and biochemical fruit traits. Hence, in this work heirloom tomato accessions were characterized, gathering information to genetic breeding programs focusing on human food. For that, 67 heirloom tomato accessions were evaluated for fruit size, fruit mass, fruit volume, color, vitamin C, titratable acidity, soluble solids content, phenolic compounds content, total flavonoid content, and antioxidant activity. The experiment was conducted in a randomized complete block design with three repetitions. Linear mixed model, Pearson’s correlation and hierarchical clustering were applied to data. Five groups were formed by Ward’s clustering method. The accession UEL 300 constituted group A, which had the greatest mass and volume fruit. Eight accessions formed group B and showed mostly yellow fruits. Group C was comprised of 13 accessions, which had the highest levels of carotenoids, vitamin C, and antioxidant activity. Thirty-three accessions that constituted group D did not stand out for any of the attributes, while 12 accessions into group E had the highest content of phenolic compounds and flavonoids, along with the highest ratio of soluble solids and acidity. Five accessions in this collection (UEL 296, UEL 146, UEL 238, UEL 231, and UEL 217) stood out for their biochemical traits. The wide diversity for physical and biochemical fruit traits can be explored in tomato breeding programs, seeking to develop new cultivars, and strengthening family farming.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67475298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enlist volunteer corn affects the crop development and seed quality of Enlist soybean 志愿玉米影响志愿大豆的作物发育和种子品质

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210207

A. Mazon, J. Cechin, C. Piasecki, Juliano Gazola, J. R. Henckes, G. Meneghello, D. Agostinetto

{"title":"Enlist volunteer corn affects the crop development and seed quality of Enlist soybean","authors":"A. Mazon, J. Cechin, C. Piasecki, Juliano Gazola, J. R. Henckes, G. Meneghello, D. Agostinetto","doi":"10.1590/1678-4499.20210207","DOIUrl":"https://doi.org/10.1590/1678-4499.20210207","url":null,"abstract":": Enlist TM technology is a new trait on soybean and corn conferring tolerance to auxinic-type (2,4-D choline) and graminicides (aryloxyphenoxypropionates – FOPs) herbicides. However, the occurrence of volunteer corn tolerant to 2,4-D and FOPs can become a significant weed on soybean cropping systems, affecting the crop yield and reducing seed quality. This research aimed to evaluate herbicides to Enlist TM volunteer corn control and their effects on plant development, crop yield, and physiological seed quality of Enlist TM soybean. Field experiment was performed in a complete randomized block experimental design with four replicates, using a density of 10 plants · m -2 of Enlist TM volunteer corn. Treatments consisted of herbicides applied at 3-4-leaves stage of volunteer corn with haloxyfop-P-methyl, clethodim, pinoxaden, cloransulam-methyl and imazethapyr regarding to a control with and without volunteer corn. The development and yield components of Enlist TM soybean were evaluated and physiological seed testing performed on soybean’s seeds. Clethodim controlled Enlist TM volunteer corn, whereas haloxyfop-P-methyl, pinoxaden, and cloransulam-methyl showed insufficient control levels (30-35%) at 30 days after spray. Imazethapyr exhibited 84% of control of Enlist TM volunteer corn and injured the Enlist TM soybean, affecting its seed viability. Enlist TM volunteer corn interferences negatively the soybean crop yield, yield components, and affects the plant development pattern.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67475434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Genetic-molecular characterization in guava full-sib progeny 番石榴全同胞后代的遗传分子特征

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210267

J. A. Oliveira, E. Santos, A. Viana, F. Walter, Rodrigo Moreira Ribeiro

{"title":"Genetic-molecular characterization in guava full-sib progeny","authors":"J. A. Oliveira, E. Santos, A. Viana, F. Walter, Rodrigo Moreira Ribeiro","doi":"10.1590/1678-4499.20210267","DOIUrl":"https://doi.org/10.1590/1678-4499.20210267","url":null,"abstract":": Brazil is one of the world’s largest producers of guava ( Psidium guajava L.), a very promising fruit in the northern region of the state of Rio de Janeiro. Despite this, no guava cultivar has been developed for the region. Thus, this study proposed to examine a population of guava full sibs using microsatellite markers and to identify which genotypes are the most divergent for future crosses, to select cultivars better adapted to the soil and climatic conditions of northern Rio Janeiro. Ninety-six superior genotypes were selected according to their agronomic traits, which were characterized using 45 microsatellite markers. The genetic distance between the analyzed genotypes, their clustering pattern and the genetic structure of the population were estimated. Hierarchical cluster analysis by the neighbor joining method indicated the formation of three distinct groups. The use of molecular information revealed the existence of moderate genetic variability between the genotypes of the full-sib families. Bayesian analysis separated the genotypes into only two groups, as the individuals shared most of the analyzed genomic regions. The most genetically divergent guava genotypes, that is, those allocated to different groups, such as genotypes 5 and 85, should be recommended for future crosses to obtain segregating populations, thus giving continuity to the guava breeding program.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67476511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Rhizobial diversity in shrub-tree legume-based silvopastoral systems 以豆科植物为基础的灌树林系统的根瘤菌多样性

IF 1.2 4区农林科学

Bragantia Pub Date : 2022-01-01 DOI: 10.1590/1678-4499.20210336

Adriana Bezerra dos Santos, G. Fracetto, F. Fracetto, M. A. Lira Junior

{"title":"Rhizobial diversity in shrub-tree legume-based silvopastoral systems","authors":"Adriana Bezerra dos Santos, G. Fracetto, F. Fracetto, M. A. Lira Junior","doi":"10.1590/1678-4499.20210336","DOIUrl":"https://doi.org/10.1590/1678-4499.20210336","url":null,"abstract":": Silvopastoral systems based on tree legumes intercropped with forage grasses can harbor a high diversity of rhizobia, and these bacteria are good indicators of soil quality in several management systems. The objective of this work was to evaluate the morphophysiological, genetic and symbiotic diversity of cowpea [ Vigna unguiculata (L.) Walp] rhizobia from soils under silvopastoral systems based on shrub-tree legumes. The experiment was performed in a randomized block design with three treatments and three replications, consisting of signalgrass ( Urochloa decumbens Stapf.) intercropped with sabia ( Mimosa caesalpiniaefolia ); signalgrass intercropped with gliricidia ( Gliricidia sepium ) and single signalgrass. The samples were collected in the legume row (0 meter) and 4 and 8 meters away. Later, cowpea was used as a trap plant to capture the rhizobia. All strains were phenotypically characterized, authenticated, and genetically identified. Phenotypical characterization of the 431 isolates showed high diversity forming 69 groups at 100% similarity, of which 60 were able to nodulate cowpea during the authentication, and 36 presented relative efficiency superior or equal to the recommended bacteria for the crop. Most of the sequenced strains belonged to Bradyrhizobium (67%) and Methylobacterium (9%). Leifsonia (9%), Cohnella (6%), Rhizobium (3%), Burkholderia (3%), and Paenibacillus (3%) were also represented. Soils under silvopastoral systems harbor efficient rhizobia populations in cowpea with a high genetic diversity, which can be recommended for agronomic efficiency assays.","PeriodicalId":9260,"journal":{"name":"Bragantia","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67477633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0