Genotype by environment interactions across diverse rainfed lowland rice environments

Wade, Leonard; McLaren, C. G.; Quintana, Lidia; Harnpichitvitaya, Dome; Rajatasereekul, S.; Sarawgi, AK; Kumar, Arvind; Ahmed, Helaluddin; Sarwoto,; Singh, Ashok Kumar; Rodriguez, Reynaldo; Siopongco, Joel D. L. C.; Sarkarung, S.

doi:10.1016/s0378-4290(99)00049-0

Cited by 115 publications

(72 citation statements)

References 16 publications

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“…Genotype by environment (G 3 E) interaction was a major contributor to the phenotypic variation for most agronomically important traits in rainfed lowland rice (IRRI, 1993;Cooper and Somrith, 1997;Wade et al, 1999). Different combinations of soil type, temperature, amount of water availability, and other agrohydrology with plant phenology were reported to influence the G 3 E interaction (Cooper and Somrith, 1997;Fukai et al, 1999).…”

Section: Effects Of Irrigation Treatmentsmentioning

confidence: 99%

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: Effects Of Irrigation Treatmentsmentioning

confidence: 99%

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

et al. 2004

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“…The S treatment then tested whether severing the portion of roots subjected to drought in the outer container would result in any recovery in Ψ L , g s , and/or Tr, with the hypothesis that severing of roots in drying soil would remove the source of the positive signal from root tips. The lowland indica rice line, IR62266-42-6-2 (IR62266), was used in this experiment, as it performs well when subjected to drought in the fl uctuating water (fl ood-drought) environment of the rainfed lowlands (Wade et al, 1999b), and is noted for its more gradual water extraction from depth and its greater ability for osmotic adjustment (Kamoshita et al, , 2004. The seminal root of each pre-germinated seed was carefully inserted through the hole in the petri dish of each pot, allowing the root system to be split, with the seminal and some nodal roots growing through the hole and into the inner pot, and the remaining nodal roots being deflected by the petri dish to the outer container (Fig.…”

Section: Greenhouse Experiments I (1) Cultural Detailsmentioning

confidence: 99%

“…A split-split plot design with 4 replications was used, with two drought timings as main plots, (41 to 68 DAS and 69 to 97 DAS); two water regimes as subplots, (well-watered, with water maintained at 5 cm depth, and droughted with irrigation and rainfall excluded in the specifi ed periods); and two entries as sub-subplots, (the upland japonica line CT9993-5-10-1-M [CT9993] and IR62266). CT9993 is reported to have a deeper root system Wade et al, 2000), and is specifi cally adapted to particular drought situations in the rainfed lowlands (Wade et al, 1999b). Three-day-old pregerminated seeds of both entries were sown on 25 September 2002, at a 25 cm by 25 cm spacing.…”

Section: Field Experiments (1) Cultural Detailsmentioning

confidence: 99%

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying ; Evidence for Root Signals

Siopongco

Sekiya

Yamauchi

et al. 2008

Plant Production Science

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“…The entries included were the upland japonica line CT9993-5-10-1-M (CT9993) and the lowland indica line IR62266-42-6-2 (IR62266). CT9993 is reported to have a deeper root system 2004), and is specifically adapted to particular drought situations in the rainfed lowlands (Wade et al, 1999b). IR62266 performs well when subjected to drought in the fluctuating water (fl ood-drought) environments of the rainfed lowlands (Wade et al, 1999b;Siopongco et al, 2005Siopongco et al, , 2006, and is noted for its more gradual water extraction from depth and its greater ability for osmotic adjustment (Kamoshita et al, , 2004.…”

mentioning

confidence: 99%

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

Siopongco

Sekiya

Yamauchi

et al. 2009

Plant Production Science

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: Previously, we demonstrated that root tips in drying soil communicate with shoots for stomatal closure in rainfed lowland rice, despite further water being available at depth. This study examines variation between two lines in root signals. Rice lines CT9993 and IR62266 were grown in the fi eld, and in the greenhouse with the split-root root-sever wax-layer system, to investigate their responses to mild and severe water defi cit by monitoring stomatal conductance (g s ), leaf water potential and leaf ABA concentration. In the greenhouse, root systems were divided, withholding water from one portion, and in some cases, severing the droughted portion of roots to remove the signal. Wax layers differing in strength were placed at hardpan depth. Roots of CT9993 were better able to penetrate the wax layers. IR62266 exhibited stronger responses than CT9993, with IR62266's stomatal conductance dropping sharply under water defi cit, and recovering at slower rates but less completely, when roots subjected to drying soil were severed. The greater stomatal response in IR62266 was associated with a higher leaf ABA concentration during early water defi cit, which in turn was associated with its greater number of roots in drying soil. In the fi eld, a second reduction in g s was observed under severe water defi cit, with stronger signals in IR62266 associated with more conservative water use as soil drying intensifi ed. To better exploit subsoil water in mild or transient water defi cit, selection for reduced root signals might be warranted.

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Genotype by environment interactions across diverse rainfed lowland rice environments

Cited by 115 publications

References 16 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

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying ; Evidence for Root Signals

Stomatal Responses in Rainfed Lowland Rice to Partial Soil Drying; Comparison of Two Lines

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