Exploring the Genetic Diversity Among Weedy Rice Accessions Differing in Herbicide Tolerance and Allelopathic Potential

Increasing agricultural productivity is indispensable to meet future food demand. Crop im-provement programs rely heavily on genetic diversity. The success of weeds in the ecosystem can be attributed to genetic diversity and plasticity. Weedy rice, a major weed of rice, has diverse morphology and phenology, implying wide genetic diversity. Study was conducted to genotype weedy rice accessions (n =54) previously phenotyped for herbicide tolerance and allelopathic potential using 30 SSR markers. Cultivated rice (CL163, REX) and allelopathic rice (RONDO, PI312777, PI338047) were also included in the study. Nei’s genetic diversity among weedy rice (0.45) was found to be higher than cultivated rice (0.24) but less than allelopathic rice (0.56). The genetic relationship and population structure based on herbicide tolerance and allelopathic po-tential were evaluated. Herbicide-tolerant and susceptible accessions formed distinct clusters in the dendrogram, indicating their genetic variation, whereas no distinction was observed between allelopathic and non-allelopathic weedy rice accessions. Weedy rice accession B2, which was previously reported to have high allelopathy and herbicide tolerance, was genetically distinct from other weedy rice. Results from the study will help leverage weedy rice for rice improvement programs as both rice and weedy rice are closely related, thus having a low breeding barrier.

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Exploring the Genetic Diversity among Weedy Rice Accessions Differing in Herbicide Tolerance and Allelopathic Potential

Diversity ◽

10.3390/d14010044 ◽

2022 ◽

Vol 14 (1) ◽

pp. 44

Author(s):

Swati Shrestha ◽

Gourav Sharma ◽

Shandrea Stallworth ◽

Edilberto D. Redona ◽

Te Ming Tseng

Keyword(s):

Genetic Diversity ◽

Crop Improvement ◽

Herbicide Tolerance ◽

Weedy Rice ◽

Cultivated Rice ◽

Allelopathic Potential ◽

Improvement Programs ◽

Rice Improvement ◽

Genetic Diversity Study ◽

Diversity Study

Increasing agricultural productivity is indispensable to meet future food demand. Crop improvement programs rely heavily on genetic diversity. The success of weeds in the ecosystem can be attributed to genetic diversity and plasticity. Weedy rice, a major weed of rice, has diverse morphology and phenology, implying wide genetic diversity. Study was conducted to genotype weedy rice accessions (n = 54) previously phenotyped for herbicide tolerance and allelopathic potential using 30 SSR markers. Cultivated rice (CL163, REX) and allelopathic rice (RONDO, PI312777, PI338047) were also included in the study. Nei’s genetic diversity among weedy rice (0.45) was found to be higher than cultivated rice (0.24) but less than allelopathic rice (0.56). The genetic relationship and population structure based on herbicide tolerance and allelopathic potential were evaluated. Herbicide-tolerant and susceptible accessions formed distinct clusters in the dendrogram, indicating their genetic variation, whereas no distinction was observed between allelopathic and non-allelopathic weedy rice accessions. Weedy rice accession B2, which was previously reported to have high allelopathy and herbicide tolerance, was genetically distinct from other weedy rice. Results from the study will help leverage weedy rice for rice improvement programs as both rice and weedy rice are closely related, thus having a low breeding barrier.

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Estimation of the genetic diversity of jabuticaba trees and association among fruit characters

Comunicata Scientiae ◽

10.14295/cs.v11i0.3337 ◽

2020 ◽

Vol 11 ◽

pp. e3337

Author(s):

José Carlos Moraes Rufini ◽

Miriã Cristina Pereira Fagundes ◽

Deniete Soares Magalhães ◽

Alejandra Semiramis Albuquerque ◽

Martha Cristina Pereira Ramos ◽

...

Keyword(s):

Genetic Diversity ◽

Nearest Neighbor ◽

Pearson Correlation ◽

Soluble Solids ◽

Clustering Methods ◽

Minas Gerais State ◽

Improvement Programs ◽

Genetic Diversity Study ◽

Fruit Characters ◽

Diversity Study

The aim of this study was to evaluate the genetic dissimilarity of different jabuticaba tree accessions from Prudente de Moraes, Minas Gerais State, Brazil, based on fruit characters. The genetic diversity study was carried out based on characters evaluated in fruits, and with the elimination of redundant descriptors, nine characters were selected to estimate genetic divergence and perform clustering. The Standardized Mean Euclidian Distance was used as dissimilarity measure. The clustering methods used were Tocher and the nearest neighbor. Correlation analysis among characters was performed by Pearson correlation (p> 0.05). Accessions 4, 5, 7 and 12 have potential for in improvement programs aiming for productivity. The character that contributed most to the genetic diversity of the accessions were the soluble solids important for the processing industry and for fresh consumption. Genotypes showed variability for most characters analyzed showing the possibility of selection and identification of parents that will be used in future crossings.

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Assessment of Genetic Diversity in Wild Rice of Eastern India Using SSR Markers

Journal of Agricultural Science ◽

10.5539/jas.v9n6p239 ◽

2017 ◽

Vol 9 (6) ◽

pp. 239

Author(s):

Rosalin Swain ◽

Shibani Mohapatra ◽

Pritesh Roy ◽

D. Swain ◽

O. N. Singh ◽

...

Keyword(s):

Genetic Diversity ◽

Ssr Markers ◽

Wild Rice ◽

West Bengal ◽

Cultivated Rice ◽

Morphological Variations ◽

Aa Genome ◽

Clustering Pattern ◽

Genetic Diversity Study ◽

Diversity Study

Wild rice is an important reservoir of valuable and useful genes. O. rufipogon and O. nivara contain AA genome andare the progenitor of cultivated rice which makes them compatible with the cultivated rice for cross breeding to incorporate the genes for stress tolerance. SSR markers were used to assess the extent of diversity of 26 accessions of O. rufipogon and O. nivara collected from different districts of Orissa, West Bengal and Tripura. The Principal Co-ordinate Analysis (PCA) clearly indicates the clustering pattern and inter-relationships among different accessions. Mantel Z-testexhibitedacorrelation between cophenetic matrix and Jaccards’ similarity coefficient in 26 accessions and 4 CRRI released varieties using 54 STMS (SSR) markers which showed significant correlation (r = 0.8249) between them. O. nivara accessions and O. rufipogon accessions were grouped different clusters. O. nivara collected from Midnapore is placed in different cluster. It is concluded that the SSR markers used were found to be equally informative for the genetic diversity study between and among the accessions of two wild species such as O. rufipogon and O. nivara collected from different locations of Orissa, West Bengal & Tripura. Highlysignificant morphological variations were also observed among O. nivara and O. rufipogon accessions.

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