Seed morphological traits and genotypic diversity of weedy rice (<i>Oryza sativa</i> f. <i>spontanea</i>) populations found in the Thai Hom Mali rice fields of north‐eastern Thailand

Prathepha, Preecha

doi:10.1111/j.1445-6664.2008.00312.x

Cited by 28 publications

(20 citation statements)

References 33 publications

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“…Phylogenetic and demographic analysis based on whole-genome sequencing revealed that Chinese weedy rice was de-domesticated independently from the cultivated rice, standing variations and new mutations contributed differently to the rapid adaptation of japonica and indica type of weedy rice from four representative regions of China (Qiu et al 2017). Similar results were found for the origins of weedy rice in Thailand and Bhutan (Prathepha 2009;Ishikawa et al 2005). Notably, crossing experiments involving intersub-specific and inter-varietal hybridization have generated progenies that exhibit weedy rice traits.…”

Section: Origin and Evolutionsupporting

confidence: 58%

“…Environmental and other factors, such as the distance between two populations, temperature, relative humidity, flower morphology, and flowering time, also affect the rate of outcrossing (Chen et al 2004;Shivrain et al 2007Shivrain et al , 2009. Introgression of foreign genes into the gene pool of weedy rice can enhance its genetic diversity and could confer some trait modifications that may or may not be of adaptive significance (Cao et al 2006;Gealy et al 2003;Prathepha 2009;Reagon et al 2011;He et al 2014;Goulart et al 2012). Crop-to-weed gene flow is of special concern when transgenes are involved as it leads to the movement of genetically modified (GM) genes to weeds that might confer survival advantages that enable them to outcompete local strains (Oard et al 2000;Lu and Snow 2005;Cao et al 2006;Zhang et al 2006;Yang et al 2012).…”

Section: Outcrossing and Its Associated Concerns In Weedy Ricementioning

confidence: 99%

“…Weedy rice is also referred to as "red rice" because of its red pericarp. However, weedy rice biotypes with white, light red, and light green pericarps are also found (Prathepha 2009). In addition, there are many grain cultivars with the red grain phenotype.…”

Section: Introductionmentioning

confidence: 99%

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Weedy rice in sustainable rice production. A review

Nadir

Xiong

Zhu

et al. 2017

Agron. Sustain. Dev.

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Weedy rice refers to the unwanted plants of the genus Oryza that have some undesirable agronomic traits and pose a major threat to sustainable rice production worldwide. Widespread adoption of direct seeded rice and hybridization or gene flow between cultivated rice and their wild relatives has resulted in the creation and dissemination of weedy rice. Currently, weedy rice (Oryza sativa f. spontanea) has become one of the most common weeds infesting rice fields worldwide. In this paper, we review the biology, physiology, evolution, and genetic features of weedy rice. We also discuss the major obstacles in weedy rice management, including high diversity of weedy rice, ecological impacts of gene flow on weedy rice, changing climate, and weedy rice management. We then present a framework for the sustainable management and utilization of weedy rice. Our main emphasis is to explore the reservoir of natural variations in weedy germplasm and to utilize them for crop improvement. This review outlines some of the latest biotechnological tools to dissect the genetic backgrounds of several favorable traits of weedy rice that may prove beneficial for breeding and evolutionary studies on cultivated rice. We suggest that by merging the disciplines of genomics, breeding, and weed management, we can achieve the goal of sustainable rice production.

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Section: Origin and Evolutionsupporting

confidence: 58%

Section: Outcrossing and Its Associated Concerns In Weedy Ricementioning

confidence: 99%

See 1 more Smart Citation

Weedy rice in sustainable rice production. A review

Nadir

Xiong

Zhu

et al. 2017

Agron. Sustain. Dev.

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“…Some weedy rice accessions are morphologically similar to wild rice (Oryza rufipogon) in characteristics such as black hull, red pericarp, low 1000 seed weight, good phenotypic plasticity, high seed shattering and dormancy, and inconsistent maturation time (Oka, 1988;Suh, 2008;Chung, 2010). These characters facilitate the distribution of weedy rice seriously impairing the yield of rice grain (Gressel and Valverde, 2009;Prathepha, 2009;Shivrain et al, 2009;Chung and Park, 2010). Direct-seeded rice systems contribute to the spread of weedy rice, which poses a threat to the rice growers in Asian countries including China, Malaysia, Thailand, India, Korea, the Philippines, Vietnam, and Sri Lanka (Delouche et al, 2007;Varshney and Tiwari, 2008;Prathepha, 2011;Chauhan, 2012;Mansor et al, 2012;Zhang et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

Morphological Characterization of Weedy Rice Populations from Different Regions of Asia

Shu-lin¹,

Tian²,

Li³

et al. 2017

mpb

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Weedy rice produces a low number of grains per plant and is considered undesirable in cultivated rice fields. It spreads rapidly because of its high phenotypic plasticity and seed shattering. We used the RID14 marker to identify the genotypes governing red and white pericarp color in weedy rice. We then evaluated 18 characters of 199 weedy rice accessions (5 rice-growing regions in Asia) and 24 of cultivated rice as control, and analyzed them using coefficients of variation, principal component analysis, and cluster analysis. Our results showed that weedy rice accessions and cultivated rice populations from different regions of Asia were significantly different in one or more of their morphological characteristics. Weedy rice significantly differed from cultivated rice in plant height at vegetative growth phase, and in pericarp color and seed shattering during the reproductive growth phase. According to principal component analysis, weedy rice populations were significantly separated from cultivated rice in North China, Korea, Southeast Asia, Korea, and South China. We used principal component analysis and cluster analysis to categorize weedy rice populations into 3 main groups: Group 1 from Korea and Northern China; group 2 from Southern China and Southeast Asia; and group 3 from Eastern China. This study established an index for morphological characteristics of weedy rice to facilitate its identification the fields, which are expected to provide a theoretical basis for weedy rice infestation control in Asia.

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“…However, those variations showed no association with agro-ecological conditions. Morphological and topographical characteristics of plant organs such as the shape and size of seeds and the structure of incidental features have been useful weapons in identifying and classifying the plant and weed species (Noda et al, 1985;Prathepha, 2009). …”

Section: Seed Morphological Diversitymentioning

confidence: 99%

Morpho-Physiological Dynamics of Weedy Rice Seeds Collected from Two Contrasting Agro-Ecological Zones in Sri Lanka

Ratnasekera¹,

Rupasingha²

2015

JTFE

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Weedy rice (Oryza sativa L. f. spontanea), seeds remain a longer period in soils at different depths enriching soil seed bank and that contribute to the success of weedy rice as a "weed." Hence basic information on the level of longevity, dormancy and germination behaviour of weedy rice seeds with relation to its morphology is very important to implement efficient control measures. In this study, weedy rice seeds were collected from six infested locations in Ampara and Matara districts representing two different agro-ecological zones in Sri Lanka. Two widely grown improved varieties (At 362 and Bg 379-2) were assembled as check lines. Thirty panicles per population were randomly collected from each location to determine their morphological characteristics including awn lengths, seed shape, hull colour, pericarp colour along with physiological phenologies such as degree of dormancy, viability, longevity and rate of survival.Significant variability of seed shape, awn length, hull colour and pericarp colour was observed. Germination rate and survival rates were highly variable and closely associated with awn characteristics. Our study clearly indicated that prolong longevity (more than 24 weeks) and viability of weedy rice seeds in field conditions implying their key role as a weed by enriching soil seed bank. Awned populations are dormant and influence weedy rice population dynamics leading to the competitiveness of this weed. Therefore, management practices have essentially to take them into account and be adapted accordingly. Further, this study inferred that the morpho-physiological variation of the weedy rice seed populations was not associated with the agro-ecological conditions; for example, the dry and the wet zone suggesting rapid seed mediated gene flow throughout the country.

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Seed morphological traits and genotypic diversity of weedy rice (Oryza sativa f. spontanea) populations found in the Thai Hom Mali rice fields of north‐eastern Thailand

Cited by 28 publications

References 33 publications

Weedy rice in sustainable rice production. A review

Weedy rice in sustainable rice production. A review

Morphological Characterization of Weedy Rice Populations from Different Regions of Asia

Morpho-Physiological Dynamics of Weedy Rice Seeds Collected from Two Contrasting Agro-Ecological Zones in Sri Lanka

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