Locating genomic regions associated with components of drought resistance in rice: comparative mapping within and across species

Zhang, J.; Zheng, Hongliang; Aarti, A.; Pantuwan, G.; Nguyen, Thom Thi; Tripathy, Jogeswar; Sarial, A. K.; Robin, S.; Babu, R. Chandra; Nguyen, Bay; Sarkarung, S.; Blum, A.; Nguyen, Henry T.

doi:10.1007/s001220000534

Cited by 231 publications

(168 citation statements)

References 37 publications

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“…The QTL for DFAIG detected in this experiment were located in the same position as the QTL for days to heading mapped by Zhang et al (2001), Babu et al (2003), and Price et al (1997). Under water deficit, the ability to maintain GY is mainly due to ability to maintain flowering time and ability to maintain high HI.…”

Section: Days To 50% Flowering After Initiation Of the Irrigation Grasupporting

confidence: 72%

“…As it was mentioned, the favorable QTL for GY were located in this region was contributed by CT9993. The same region was reported to harbor QTL for days to 50% flowering under control and stress conditions by Zhang et al (2001) and Babu et al (2003).…”

Section: Harvest Indexsupporting

confidence: 56%

“…Interestingly, the qpss9.1 was in the same position as the QTL for osmotic adjustment (OA), designated as oa9.1, reported by Zhang et al (2001). The qpss8.1 and qpss8.2, only expressed in response to mild or severe drought stress, was also mapped to the same position as the QTL for OA designated oa8.1 by Zhang et al (2001) and QTL for OA located at RG1 to RM80 by Robin et al (2003). IR62266 alleles at both QTL increase OA and also spikelet fertility under drought stress.…”

Section: Total Spikelet Numbermentioning

confidence: 67%

“…CT9993 alleles contributed to higher PSS in all detected QTL. Zhang et al (2001) reported QTL for spikelet sterility on chromosome 9 in the same mapping population. However, this QTL was at different position as compared with qpss9.1.…”

Section: Total Spikelet Numbermentioning

confidence: 87%

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Quantitative Trait Loci Associated with Drought Tolerance at Reproductive Stage in Rice

et al. 2004

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Drought is a major constraint to rice (Oryza sativa) yield and its stability in rainfed and poorly irrigated environments. Identifying genomic regions influencing the response of yield and its components to water deficits will aid in our understanding of the genetics of drought tolerance and development of more drought tolerant cultivars. Quantitative trait loci (QTL) for grain yield and its components and other agronomic traits were identified using a subset of 154 doubled haploid lines derived from a cross between two rice cultivars, CT9993-510 to 1-M and IR62266-42 to 6-2. Drought stress treatments were managed by use of a line source sprinkler irrigation system, which provided a linearly decreasing level of irrigation coinciding with the sensitive reproductive growth stages. The research was conducted at the Ubon Rice Research Center, Ubon, Thailand. A total of 77 QTL were identified for grain yield and its components under varying levels of water stress. Out of the total of 77 QTL, the number of QTL per trait were: 7-grain yield (GY); 8-biological yield (BY); 6-harvest index (HI); 5-d to flowering after initiation of irrigation gradient (DFAIG); 10-total spikelet number (TSN); 7-percent spikelet sterility (PSS); 23-panicle number (PN); and 11-plant height (PH). The phenotypic variation explained by individual QTL ranged from 7.5% to 55.7%. Under wellwatered conditions, we observed a high genetic association for BY, HI, DFAIG, PSS, TSN, PH, and GY. However, only BY and HI were found to be significantly associated with GY under drought treatments. QTL flanked by markers RG104 to RM231, EMP2_2 to RM127, and G2132 to RZ598 on chromosomes 3, 4, and 8 were associated with GY, HI, DFAIG, BY, PSS, and PN under drought treatments. The aggregate effects of these QTL on chromosomes 3, 4, and 8 resulted in higher grain yield. These QTL will be useful for rainfed rice improvement, and will also contribute to our understanding of the genetic control of GY under drought conditions at the sensitive reproductive stage. Close linkage or pleiotropy may be responsible for the coincidence of QTL detected in this experiment. Digenic interactions between QTL main effects for GY, BY, HI, and PSS were observed under irrigation treatments. Most (but not all) DH lines have the same response in measure of productivity when the intensity of water deficit was increased, but no QTL by irrigation treatment interaction was detected. The identification of genomic regions associated with GY and its components under drought stress will be useful for marker-based approaches to improve GY and its stability for farmers in drought-prone rice environments.In rainfed lowland areas, one of the major abiotic constraints depressing rice (Oryza sativa) production is water stress, including deficit (drought) or excess water (flood; O' Toole and Chang, 1979;Herdt, 1991;Lin and Shen, 1993). Drought stress is a serious limiting factor to rice production and yield stability in rainfed rice areas (Dey and Upadhyaya, 1996). The occurrence of drought can be as...

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Section: Days To 50% Flowering After Initiation Of the Irrigation Grasupporting

confidence: 72%

Section: Harvest Indexsupporting

confidence: 56%

Section: Total Spikelet Numbermentioning

confidence: 67%

Section: Total Spikelet Numbermentioning

confidence: 87%

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Quantitative Trait Loci Associated with Drought Tolerance at Reproductive Stage in Rice

et al. 2004

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“…Various root architecture traits among them, rooting depth, root density, root thickness and root distribution pattern (Pantuwan et al, 1996;Wade et al, 1996;Lilley and Fukai, 1994;Fukai and Cooper, 1995) enhance plant water uptake, thereby avoiding dehydration. QTLs for morphology and the index of root penetration have been identified in several rice populations (Champoux et al, 1995;Ray et al, 1996;Zhang et al, 2001;Kijoji et al, 2014;Henry et al, 2014). Liu et al (2009) identified and cloned a gene named OsDHODH1 which encodes a putative cytosolic dihydroorotate dehydrogenase (DHODH) in rice.…”

Section: Genes/qtl Underlying Drought Secondary Traitsmentioning

confidence: 99%

The effects of drought on rice cultivation in sub-Saharan Africa and its mitigation: A review

Noelle¹,

Rodrigue²,

Gnikoua³

2018

Afr. J. Agric. Res.

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Drought is the primary cause of yield loss in agriculture throughout the world, and is currently the most common reason for global food shortages. Three-quarter of the most severe droughts in the last ten years have been in Africa, the continent which already has the lowest level of crop production and drought adaptive capacity. The increased incidences of drought and erratic rainfall have thrown small holder farmers in Africa into deep poverty, hunger and malnutrition. In this paper, the drought situation in sub-Saharan Africa and its impact on rice production was reviewed. Rice is particularly vulnerable to droughts as it has higher water requirement as compared to other crops. The review has also highlighted physiological and molecular plant responses to drought, with special focus on effects of drought stress on rice grain yield and other related-traits. With climate change predicted to exacerbate the problem of water security in Africa, it is imperative that we develop robust, well-planned and informed strategies to mitigate against drought. Various drought mitigation strategies including breeding for drought tolerance and water harvesting and conservation techniques are also outlined. In order to adapt to drought, there is need for a broad based approach that includes development of appropriate policies, putting in place necessary water related investments and institutions as well as capacity building at various levels.

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Molecular Bases of Plant Adaptation to Abiotic Stress and Approaches to Enhance Tolerance to Hostile Environments

Coraggio

Tuberosa

2004

Handbook of Plant Biotechnology

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Abiotic stress has become the greatest threat to global food production and security, particularly in developing countries. Progress in increasing yield and its stability under adverse conditions through a direct selection has been hampered by the low heritability of yield, especially under drought. A better knowledge of the molecular and genetic basis of the mechanisms promoting tolerance to abiotic stress will enhance our capacity to more appropriately manipulate the genes limiting crop yield under hostile environments. This review describes and critically analyses the major advances in our understanding of the complex mechanisms underlying the adaptive response of the plant to abiotic stress, starting with the perception of the stress at the cellular level, its transduction through a cascade of signalling molecules and ending with the induction of genes whose products mitigate the harmful effects of the stress. Molecular markers and the ‘omics’ platforms (e.g., transcriptomics, proteomics, metabolomics etc.) offer unprecedented opportunities to identify and clone the genes governing plant adaptation to environmental stress and limiting yield under such conditions. The dissection of the genetic basis of quantitative traits into their single components, the so‐called QTLs (quantitative trait loci), allows us to deploy marker‐assisted selection (MAS) for enhancing crop performance under adverse conditions. Additional opportunities are also offered by genetic engineering, particularly through the expression of transcription factors regulating a suite of genes whose product is crucial to mitigate the effects of stress. Although the applicative results so far achieved with non‐conventional approaches have been limited, their integration with conventional breeding methodologies and other interdisciplinary approaches will greatly enhance our capacity to more effectively tailor crop genome to withstand harsh environmental conditions and to improve their sustainability under marginal conditions.

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Locating genomic regions associated with components of drought resistance in rice: comparative mapping within and across species

Cited by 231 publications

References 37 publications

Quantitative Trait Loci Associated with Drought Tolerance at Reproductive Stage in Rice

Quantitative Trait Loci Associated with Drought Tolerance at Reproductive Stage in Rice

The effects of drought on rice cultivation in sub-Saharan Africa and its mitigation: A review

Molecular Bases of Plant Adaptation to Abiotic Stress and Approaches to Enhance Tolerance to Hostile Environments

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