Diversity of weedy red rice (Oryza sativa L.) in Arkansas, U.S.A. in relation to weed management

Shivrain, Vinod K.; Burgos, Nilda R.; Scott, Robert C.; Gbur, Edward E.; Estorninos, Leopoldo E.; McClelland, Marilyn

doi:10.1016/j.cropro.2010.02.010

Cited by 67 publications

(105 citation statements)

References 27 publications

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“…Our results suggest, moreover, that with selection of HR weedy rice, phenotypic and genetic diversity may increase in weedy populations. For example, in the past, weedy rice in the United States has comprised primarily awnless straw-hull types (70%), with black-hull types comprising only 22% and brown-hull types comprising only 7% of historical weedy populations (Shivrain et al, 2010b). We observed more seed types from HR weedy rice populations (Fig.…”

Section: Discussionmentioning

confidence: 68%

“…4B). A few were shorter than cultivated rice, as was observed with pre-Clearfield rice accessions Shivrain et al, 2010b). Panicles were mostly 20 to 25 cm long (Fig.…”

Section: Phenotypic Characterization Of Herbicide-resistant Weedy Ricementioning

confidence: 74%

“…3) than among the historical populations (Shivrain et al, 2010b). Likewise, heights of HR weedy rice were widely diverse, from 0.6 to 2 m tall, while historically weedy rice plants have been generally tall (mean = 125 cm, 200+ accessions), with the tallest plants being 190 cm (Shivrain et al, 2010b). This height diversity is important for management because short plants escape notice by field scouts.…”

Section: Discussionmentioning

confidence: 96%

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The Impact of Herbicide-Resistant Rice Technology on Phenotypic Diversity and Population Structure of United States Weedy Rice

et al. 2014

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The use of herbicide-resistant (HR) Clearfield rice (Oryza sativa) to control weedy rice has increased in the past 12 years to constitute about 60% of rice acreage in Arkansas, where most U.S. rice is grown. To assess the impact of HR cultivated rice on the herbicide resistance and population structure of weedy rice, weedy samples were collected from commercial fields with a history of Clearfield rice. Panicles from each weedy type were harvested and tested for resistance to imazethapyr. The majority of plants sampled had at least 20% resistant offspring. These resistant weeds were 97 to 199 cm tall and initiated flowering from 78 to 128 d, generally later than recorded for accessions collected prior to the widespread use of Clearfield rice (i.e. historical accessions). Whereas the majority (70%) of historical accessions had straw-colored hulls, only 30% of contemporary HR weedy rice had straw-colored hulls. Analysis of genotyping-by-sequencing data showed that HR weeds were not genetically structured according to hull color, whereas historical weedy rice was separated into straw-hull and black-hull populations. A significant portion of the local rice crop genome was introgressed into HR weedy rice, which was rare in historical weedy accessions. Admixture analyses showed that HR weeds tend to possess crop haplotypes in the portion of chromosome 2 containing the ACETOLACTATE SYNTHASE gene, which confers herbicide resistance to Clearfield rice. Thus, U.S. HR weedy rice is a distinct population relative to historical weedy rice and shows modifications in morphology and phenology that are relevant to weed management.

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Section: Discussionmentioning

confidence: 68%

“…4B). A few were shorter than cultivated rice, as was observed with pre-Clearfield rice accessions Shivrain et al, 2010b). Panicles were mostly 20 to 25 cm long (Fig.…”

Section: Phenotypic Characterization Of Herbicide-resistant Weedy Ricementioning

confidence: 74%

Section: Discussionmentioning

confidence: 96%

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The Impact of Herbicide-Resistant Rice Technology on Phenotypic Diversity and Population Structure of United States Weedy Rice

et al. 2014

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“…Based on the combined analysis of the three competitiveness indices, blackhull was more competitive than strawhull for SDW and LA variables, while there was no difference among biotypes for H (Table 3). These results are possibly related to greater tiller emission capacity of blackhull as described by Shivrain et al (2010). Study showed that tillering ability is the best predictor of plant competitiveness, including being used for selection of rice cultivars with greater competitive ability (Ni et al, 2000), which helps explain the results.…”

Section: Resultsmentioning

confidence: 56%

“…The exception was the plant height, which was reduced in the red blackhull red rice compared to monoculture when there was the presence of strawhull red rice. Study aimed at characterizing phenotypically the different types of red rice in the State of Arkansas found that the blackhull showed higher H compared to strawhull (Shivrain et al, 2010). However, it is noteworthy that the blackhull has higher genetic diversity compared to strawhull due to the greater proximity with wild rice, which has less selection pressure imposed by man and therefore less reduction in genetic diversity (Londo & Schaal, 2007), which could partly explain the lowest H observed for blackhull plants in the experiment.…”

Section: Resultsmentioning

confidence: 75%

Relative competitive ability of rice with strawhull and blackhull red rice biotypes

Nohatto¹,

Agostinetto²,

Gealy³

et al. 2016

Científica

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The weed interference varies on several factors, especially the composition of the weed community and the ability to compete with the culture. Thus, this study aimed at evaluating the competitive ability of rice and different populations of red rice (strawhull or blackhull). The experiments were conducted in greenhouse from January to August 2013, at United States Department of Agriculture, Dale Bumpers National Rice Research Center (USDA/DBNRRC) in the city of Stuttgart, Arkansas. The experimental design was completely randomized with four replications. Treatments consisted of rice or red rice plant ratios (100:0, 75:25, 50:50, 25:75 and 0:100%). Variables evaluated included: shoot dry weight, leaf area and plant height. Results show that strawhull or blackhull red rice biotypes have superior competitive ability than rice, CL 142 AR. Overall, the blackhull red rice biotype has superior competitive ability compared to strawhull one. For rice, the interspecific competition dominates, while for red rice biotypes the intraspecific competition was more harmful.Additional keywords: interference; Oryza sativa; replacement series. ResumoA interferência de plantas daninhas varia em função de vários fatores, destacando-se a composição da comunidade infestante e a capacidade dessa de competir com a cultura. Diante disso, o objetivo do trabalho foi avaliar a habilidade competitiva entre arroz e diferentes populações de arroz-vermelho (strawhull ou blackhull). Os experimentos foram conduzidos em casa de vegetação, no período de janeiro a agosto de 2013, no Departamento de Agricultura dos Estados Unidos, Dale Bumpers National Rice Research Center (USDA/DBNRRC), na cidade de Stuttgart, Arkansas. O delineamento experimental utilizado foi o completamente casualizado, com quatro repetições. Os tratamentos consistiram nas proporções de plantas de arroz ou arrozvermelho (100:0; 75:25; 50:50; 25:75 e 0:100%). As variáveis avaliadas foram: massa da matéria seca da parte aérea, área foliar e estatura de planta. Os resultados obtidos evidenciam que os biótipos de arroz-vermelho strawhull ou blackhull apresentam habilidade competitiva superior ao arroz, cultivar CL 142 AR, enquanto, o biótipo de arroz-vermelho blackhull, em geral, apresenta superioridade competitiva comparada ao strawhull. Para o arroz, a competição interespecífica predomina, enquanto para os biótipos de arroz-vermelho a competição intraespecífica foi mais prejudicial.Palavras-chave adicionais: interferência; Oryza sativa; série de substituição.

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Registration of two rice mapping populations using weedy rice ecotypes as a novel germplasm resource

Jia

Singh

Gealy

et al. 2021

J of Plant Registrations

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Two mapping populations were developed from crosses of the Asian indica rice (Oryza sativa L.) cultivar 'Dee Geo Woo Gen' (DGWG; PI 699210 Parent, PI 699212 Parent) and two weedy rice ecotypes, an early-flowering straw hull (SH) biotype AR-2000-1135-01 (PI 699209 Parent) collected in Arkansas and a late-flowering black hull (BHA) biotype MS-1996-9 (PI 699211 Parent) collected in Mississippi. The weed and crop-based rice recombinant inbred line (RIL) mapping populations have been used to identify genomic regions associated with weedy traits as well as resistance to sheath blight and rice blast diseases. The mapping population consists of 185 (DGWG/SH; Reg. no. MP-9, NSL 541035 MAP) and 234 (BHA/DGWG;Reg. no. MP-10, NSL 541036 MAP) F 8 RILs, of which 175 (DGWG/SH) and 224 (BHA/DGWG) were used to construct two linkage maps using single nucleotide polymorphic markers to identify weedy traits, sheath blight, and blast resistance loci. These mapping populations and related datasets represent a valuable resource for basic rice evolutionary genomic research and applied marker-assisted breeding efforts in disease resistance. INTRODUCTIONWeedy rice, composed of plants in the genus Oryza, is a major agricultural pest worldwide. Weedy rice is a highly troublesome, widespread, and persistent weed of rice; it is often the same species as the crop (Oryza sativa L.) but can also have origins in wild Oryza species. Weedy rice is often taller than cultivated rice, resulting in crop lodging; has strong seed dor-

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Diversity of weedy red rice (Oryza sativa L.) in Arkansas, U.S.A. in relation to weed management

Cited by 67 publications

References 27 publications

The Impact of Herbicide-Resistant Rice Technology on Phenotypic Diversity and Population Structure of United States Weedy Rice

The Impact of Herbicide-Resistant Rice Technology on Phenotypic Diversity and Population Structure of United States Weedy Rice

Relative competitive ability of rice with strawhull and blackhull red rice biotypes

Registration of two rice mapping populations using weedy rice ecotypes as a novel germplasm resource

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