A model of the relationship between weedy rice seed‐bank dynamics and rice‐crop infestation and damage in Jiangsu Province, China

Zhang, Zheng; Dai, Weimin; Song, Xiaoling; Qiang, Sheng

doi:10.1002/ps.3649

Cited by 23 publications

(17 citation statements)

References 37 publications

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“…Therefore, rice yield was drastically reduced when weedy rice density increased in the rice field. A relationship of weedy rice density vs. rice yield modeled by Zhang et al (2014) is presented in Figure 2.…”

Section: Weedy Rice Biology and Competition With Cultivated Ricementioning

confidence: 99%

Competitive ability of cultivated rice against weedy rice biotypes: A review

Olajumoke

Juraimi

Uddin

et al. 2016

Chilean J. Agric. Res.

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Weedy rice has been identified as a threat to rice production worldwide. Its phenotypic and genotypic diversity and its potential to compete against rice in all development stages from germination to maturity have resulted in a loss of rice yield and grain quality, which is remarkably high in directseeded rice cultivation. Weedy rice dormancy varies, it has a higher germination rate, and tolerates deeper germination depth compared to rice cultivars. Interactions of weedy rice with cultivars often reflect early vigor, more tillering, nutrient utilization ability for shoot development with respect to rice cultivars even though the latter also show an improvement in shoot development under competition. An exponential relationship has been reported between cultivated rice loss and weedy rice density: this is true for all rice cultivars. The degree of loss is dependent on the competitive ability of the rice cultivar being studied, and each weedy rice biotype also interacts differently. Hence, the need for a comprehensive study of the biology of various weedy rice variants. Difficulties arise in the management of weedy rice due to its physiological, anatomical, and morphological similarities to cultivated rice. The manipulation of the environment to improve cultivated rice production and suppress the emergence of weedy rice variants is important in the management of weedy rice, as well as other cultural practices and use of pesticides. The development of herbicide-resistant rice cultivars is necessary to totally eliminate the weedy rice variants. This review provides information on the competitive ability of weedy rice against rice cultivars; this information is essential to create management options to control weedy rice.

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Section: Weedy Rice Biology and Competition With Cultivated Ricementioning

confidence: 99%

Competitive ability of cultivated rice against weedy rice biotypes: A review

Olajumoke

Juraimi

Uddin

et al. 2016

Chilean J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…As such, this study sets out to estimate both the yield losses attributed to an established red rice seed bank as well as estimate the percentage of red rice kernels in commercial rice. We follow the red rice seed bank and rice crop infestation dynamic model put forth by Zhang, Dai, Song, and Qiang [33] to estimate rice yield loss. Appendix B provides a brief description of the model.…”

Section: Methodsmentioning

confidence: 99%

“…where YL t represents the percentage rice yield loss and M t is the density of mature red rice per square meter (m −2 ) in year t. Following Zhang, Dai, Song, and Qiang [33], we dynamically model M t as a function of the initial red rice seed bank in year t that germinates and survives competition. The contribution of mature red rice plants in year t to the initial seed bank in year t + 1 is a function of the shattering rate, the number of seeds produced per red rice plant, and the dormancy rate.…”

Section: Methodsmentioning

confidence: 99%

“…Discount rates vary greatly by grade and can therefore significantly reduce revenue in the presence of a severe red rice infestation. Following [33], we simulate the red rice contamination in the paddy rice. Specifically, we modify Equation (A5) to account for the number of red rice kernels that remain in the panicles after shattering and are thus harvested together with commercial rice.…”

Section: Dockage Penaltymentioning

confidence: 99%

“…In other words, the lower the competition with other red rice plants, the higher the production of kernels per red rice plant. Using the shattering rate of 43% estimated by Zhang, Dai, Song, and Qiang [33], we estimate the number of red rice kernels that do not shatter at time t to be 605, 2324, and 5357 kernels m −2 for the light, moderate, and heavy infestation scenarios, respectively. Assuming that 1000 kernels of red rice weigh 25 grams, we then convert X tr to grams m −2 .…”

Section: Dockage Penaltymentioning

confidence: 99%

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Economic Benefits of Controlling Red Rice: A Case Study of the United States

Durand‐Morat

Nalley

2019

Agronomy

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Red rice (O. sativa) is one the most prevalent and damaging weed problems in direct seeding rice systems worldwide and can cause significant losses in rice productivity and quality. Red rice has been a problem in the United States for decades, and it is a growing problem in Asia, where 90 percent of the global rice production occurs. Unlike for other crops, where genetically engineered (GE) herbicide tolerant varieties are available, to date, Clearfield (CL) and Provisia rice are the only technologies available to selectively control red rice using chemical herbicides in commercial rice fields. We develop a counterfactual scenario without CL rice and ascertain the yield and quality losses due to red rice infestation in the Mid-South of the United States. Our findings suggest that even with the higher costs of CL rice, relative to non-CL rice, that the returns are $0.15, $0.36, and $0.54 more for every dollar invested than non-CL rice with a light, moderate, and heavy initial red rice infestation rate, respectively. These results imply that the higher upfront costs for CL rice are offset by more than proportional higher profits relative to their non-CL rice counterparts.

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Genome re-sequencing suggested a weedy rice origin from domesticated indica-japonica hybridization: a case study from southern China

Qiu

Zhu

et al. 2014

Planta

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Whole-genome re-sequencing of weedy rice from southern China reveals that weedy rice can originate from hybridization of domesticated indica and japonica rice. Weedy rice (Oryza sativa f. spontanea Rosh.), which harbors phenotypes of both wild and domesticated rice, has become one of the most notorious weeds in rice fields worldwide. While its formation is poorly understood, massive amounts of rice genomic data may provide new insights into this issue. In this study, we determined genomes of three weedy rice samples from the lower Yangtze region, China, and investigated their phylogenetics, population structure and chromosomal admixture patterns. The phylogenetic tree and principle component analysis based on 46,005 SNPs with 126 other Oryza accessions suggested that the three weedy rice accessions were intermediate between japonica and indica rice. An ancestry inference study further demonstrated that weedy rice had two dominant genomic components (temperate japonica and indica). This strongly suggests that weedy rice originated from indica-japonica hybridization. Furthermore, 22,443 novel fixed single nucleotide polymorphisms were detected in the weedy genomes and could have been generated after indica-japonica hybridization for environmental adaptation.

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A model of the relationship between weedy rice seed‐bank dynamics and rice‐crop infestation and damage in Jiangsu Province, China

Abstract: By integrating the semi-empirical model and the exponential curve, weedy rice infestation levels and crop losses can be predicted based on the seed-bank dynamics so that a practical control can be adopted before rice planting.

Cited by 23 publications

References 37 publications

Competitive ability of cultivated rice against weedy rice biotypes: A review

Competitive ability of cultivated rice against weedy rice biotypes: A review

Economic Benefits of Controlling Red Rice: A Case Study of the United States

Genome re-sequencing suggested a weedy rice origin from domesticated indica-japonica hybridization: a case study from southern China

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