Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield

Boonjung, H.; Fukai, S.

doi:10.1016/0378-4290(96)00039-1

Cited by 211 publications

(130 citation statements)

References 13 publications

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“…GY in all irrigation treatments showed negative correlations with PSS indicating that drought stress occurring during the reproductive stage increased the PSS and consequently decreased the GY. This evidence was reported by Boonjung and Fukai (1996), in which the yield reduction of 40% was due to the increment of PSS when drought occurred during grain filling period (Jongdee et al, 2002). Under well watered conditions, the level of PSS of IR62266 and CT9993 was not significantly different.…”

Section: Total Spikelet Numbersupporting

confidence: 62%

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: Total Spikelet Numbersupporting

confidence: 62%

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

et al. 2004

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“…Dramatic reduction of grain yield occurs when stress coincides with the irreversible reproductive processes, making the genetic analysis of drought resistance at the reproductive stage crucially important (Cruz and O'Toole 1984;Price and Courtois 1999;Boonjung and Fukai 2000;Pantuwan et al 2002). However, variation of flowering time in segregating populations often made the phenotyping of drought resistance rather inaccurate.…”

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confidence: 99%

Genetic Basis of Drought Resistance at Reproductive Stage in Rice: Separation of Drought Tolerance From Drought Avoidance

et al. 2006

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Drought tolerance (DT) and drought avoidance (DA) are two major mechanisms in drought resistance of higher plants. In this study, the genetic bases of DTand DA at reproductive stage in rice were analyzed using a recombinant inbred line population from a cross between an indica lowland and a tropical japonica upland cultivar. The plants were grown individually in PVC pipes and two cycles of drought stress were applied to individual plants with unstressed plants as the control. A total of 21 traits measuring fitness, yield, and the root system were investigated. Little correlation of relative yield traits with potential yield, plant size, and root traits was detected, suggesting that DTand DA were well separated in the experiment. A genetic linkage map consisting of 245 SSR markers was constructed for mapping QTL for these traits. A total of 27 QTL were resolved for 7 traits of relative performance of fitness and yield, 36 QTL for 5 root traits under control, and 38 for 7 root traits under drought stress conditions, suggesting the complexity of the genetic bases of both DT and DA. Only a small portion of QTL for fitness-and yield-related traits overlapped with QTL for root traits, indicating that DT and DA had distinct genetic bases.

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“…The delay in flowering by weed competition could be due to the effect of the competition for light, water, and nutrients, although we can not identify which factors strongly affect the delay in this study. Water stress and low nutrient availability have been reported to cause delay in flowering in rice, and cultivars differed in the response of fl owering time to water or nutrient availability (Boonjung and Fukai, 1996;Wonparasaid et al, 1996;Fukai, 1999). For competition for light, Nakano (2000) reported that 95% shading for 16-34 d at the early vegetative stage delayed heading by 4-11 d and reduced the number of spikelets per panicle and grain filling percentage.…”

Section: Discussionmentioning

confidence: 99%

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

Saito

Phanthaboon²,

Shiraiwa

et al. 2010

Plant Production Science

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Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield

Cited by 211 publications

References 13 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

Genetic Basis of Drought Resistance at Reproductive Stage in Rice: Separation of Drought Tolerance From Drought Avoidance

Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

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