Genotypic Variation in Response of Rainfed Lowland Rice to Prolonged Drought and Rewatering

By A. Kamoshita, Reynaldo Rodríguez, A. Yamauchi, L. Wade. 2004

138 citations recorded by the source corpus.

Abstract Duration of the drought period is important for plant response during drought and after rewatering. We hypothesized that, if drought duration is extended, (1) high seedling vigor and rapid development of a deep root system will not be advantageous, and (2) osmotic adjustment will be more important. Six diverse rice (Oryza sativa L.) genotypes were selected from rainfed lowland germplasms to examine the development of a deep root system and osmotic adjustment, and their relationship with biomass production during drought and after rewatering, under two different drought durations (shorter and prolonged) in the greenhouse. NSG19 and KDML105 had greater seedling vigor (larger seedling biomass), developed a deep root system earlier in response to drought, extracted soil water more quickly, and their pre-dawn leaf water potential declined more rapidly during the prolonged drought period. These two genotypes showed superior drought recovery even after a prolonged drought period in which they suffered a greater reduction in transpiration, water use efficiency, and biomass production. The superior recovery ability was associated with larger plant size by the end of the drought period rather than with plant water status during drought, such as osmotic adjustment or leaf water potential. Osmotic adjustment was greater during prolonged drought periods (ca. 0.7 MPa) than during shorter drought periods (ca. 0.5 MPa), and lower osmotic adjustment was mostly associated with a higher leaf water potential. Genotypic variation in osmotic adjustment was observed, but there was no clear relationship between osmotic adjustment and biomass production during drought periods. These patterns of response of rice seedlings to drought and rewatering in the greenhouse should help to explain the patterns of adaptation of rainfed lowland rice in the field. Selection for drought recovery ability should be an advantageous strategy for early season drought.

Subfields: Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/fd7a719515a5f3b4f97974a75e2d65f99825be8d

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Citations in the corpus

Phenotypic and genotypic analysis of drought-resistance traits for development of rice cultivars adapted to rainfed environments (2008, background): “Genotypes with greater plant height are often larger in overall plant size, intercept more light and use water faster by transpiration, leading to lower plant water status (Kamoshita et al., 2004), higher leaf death scores, and more spikelet sterility (Pantuwan et al., 2002c; Kato et al., 2007b).”
Genotype x environment interactions for grain yield of upland rice backcross lines in diverse hydrological environments (2008, background): “…during vegetative growth, can interrupt floret initiation, while drought during flowering causes spikelet sterility, and terminal drought effects grain filling (Ekanayake et al., 1989; Lilley and Fukai, 1994c; Kamoshita et al., 2001; Lafitte, 2002; Pantuwan et al., 2002; Kamoshita et al., 2004).”
Fractal analysis on root systems of rice plants in response to drought stress (2009, background): “In contrast, IR62266 followed a tolerance strategy favoring osmotic adjustment and had a shallow root system with slower access of available water at depth (Wade et al, 2000; Azhiri-Sigari et al., 2000; Kamoshita et al., 2000; 2004).”
Advances in Drought Resistance of Rice (2009, background): “Genotypes with greater plant height are often larger in overall plant size, intercept more light and use water faster by transpiration, leading to lower plant water status (Kamoshita et al., 2004), higher leaf death scores and more spikelet sterility (Pantuwan et al.”