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

10.20944/preprints202112.0157.v1 ◽

2021 ◽

Author(s):

Swati Shrestha ◽

Gourav Sharma ◽

Shandrea Stallworth ◽

E. D. Redoña ◽

Te Ming Tseng

Keyword(s):

Genetic Diversity ◽

Herbicide Tolerance ◽

Weedy Rice ◽

Rice Accession ◽

Cultivated Rice ◽

Allelopathic Potential ◽

Improvement Programs ◽

Rice Improvement ◽

Genetic Diversity Study ◽

Diversity Study

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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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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Response of weedy rice (Oryzaspp.) germplasm from Arkansas to glyphosate, glufosinate, and flumioxazin

Weed Science ◽

10.1017/wsc.2018.92 ◽

2019 ◽

Vol 67 (3) ◽

pp. 303-310 ◽

Cited By ~ 2

Author(s):

Swati Shrestha ◽

Gourav Sharma ◽

Nilda Roma Burgos ◽

Te-Ming Tseng

Keyword(s):

Crop Improvement ◽

Herbicide Tolerance ◽

Weedy Rice ◽

Response Analysis ◽

Rice Cultivars ◽

Plant Mortality ◽

Cultivated Rice ◽

Seed Shattering ◽

Asynchronous Maturation ◽

High Tillering

AbstractWeedy rice (Oryzaspp.) is one of the most competitive weeds in rice (Oryza sativaL.) production. Rapid growth, high tillering, enhanced ability to uptake fertilizers, asynchronous maturation, seed shattering, and high seedbank longevity makeOryzaspp. more competitive than cultivated rice and highly persistent.Oryzaspp. may be a source of useful traits for crop improvement such as herbicide tolerance. Greenhouse studies were conducted to evaluate the response of 54Oryzaspp. accessions collected between 2008 and 2009 from Arkansas to glyphosate, glufosinate, and flumioxazin applied at field rates. Rice cultivars ‘CL163’ and ‘REX’ were included for comparison. Accessions B20, B2, and S11 and B49, B51, and S59 showed reduced sensitivity to glyphosate and flumioxazin, respectively. These accessions had less than 40% injury 5 wk after treatment (WAT). Rice cultivars (CL163 and REX) were sensitive to both glyphosate and flumioxazin, with more than 95% plant mortality at 5 WAT. On average, blackhull accessions were more tolerant to glyphosate and flumioxazin than strawhull accessions. Dose–response analysis of B20, B2, and S11 confirmed 3- to 8-fold higher tolerance of these accessions to glyphosate. AllOryzaspp. and cultivated rice were not affected by glufosinate applied at 874 g ai ha−1(1X) and were controlled 100% by 1,311 g ai ha−1(1.5X).Oryzaspp. lines with reduced sensitivity to glyphosate and flumioxazin will be studied further for use in rice crop improvement.

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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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Isolation and Characterization of Microsatellite Loci of Clarias macrocephalus and Their Application to Genetic Diversity Study

Fisheries Science ◽

10.2331/fishsci.65.520 ◽

1999 ◽

Vol 65 (4) ◽

pp. 520-526 ◽

Cited By ~ 18

Author(s):

Uthairat Na-Nakorn ◽

Nobuhiko Taniguchi ◽

Estu Nugroho ◽

Shingo Seki ◽

Wongpathom Kamonrat

Keyword(s):

Genetic Diversity ◽

Microsatellite Loci ◽

Isolation And Characterization ◽

Clarias Macrocephalus ◽

Genetic Diversity Study ◽

Diversity Study

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Genetic Diversity Study through K-means Clustering in Germplasm Accessions of Green gram [Vigna radiata (L.)] Under Drought Condition

International Journal of Bio-resource and Stress Management ◽

10.23910/ijbsm/2020.11.2.2078 ◽

2020 ◽

Vol 11 (2) ◽

pp. 138-147

Author(s):

Kanavi, M. S. P. ◽

◽

Prakash Koler ◽

Somu, G. ◽

N. Marappa ◽

...

Keyword(s):

Genetic Diversity ◽

Vigna Radiata ◽

Green Gram ◽

Drought Condition ◽

Genetic Diversity Study ◽

Diversity Study ◽

Germplasm Accessions

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Population structure and genetic diversity analysis in Sali (Oryza sativa) rice germplasm of Assam using microsatellite markers

ORYZA- An International Journal on Rice ◽

10.35709/ory.2021.58.2.4 ◽

2021 ◽

Vol 58 (2) ◽

pp. 279-286

Author(s):

Sandhani Saikia ◽

Pratap Jyoti Handique ◽

Mahendra K Modi

Keyword(s):

Genetic Diversity ◽

Ssr Markers ◽

Genetic Improvement ◽

Crop Improvement ◽

Mean Value ◽

Diversity Analysis ◽

Rice Cultivars ◽

Improvement Program ◽

Information Index ◽

Improvement Programs

Genetic diversity is the source of novel allelic combinations that can be efficiently utilized in any crop improvement program. To facilitate future crop improvement programs in rice, a study was designed to identify the underlying genetic variations in the Sali rice germplasms of Assam using SSR markers. The 129 SSR markers that were used in the study amplified a total of 765 fragments with an average of 5.93 alleles per locus. The Shannon's Information Index was found to be in the range from 0.533 to 1.786. The Polymorphism Information Content (PIC) fell into the range from 0.304 to 0.691 with a mean value of 0.55. The overall FST value was found to be 0.519 that indicated the presence of genetic differentiation amongst the genotypes used in the study. The Sali population was divided into two clusters. The information obtained from the present study will facilitate the genetic improvement of Sali rice cultivars.

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