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• W167406983 abstract "Rice (Oryza sativa) evolved as a sen1i-aquatic plant and therefore is very sensitive to water stress. Grain yield of rice is reduced when the physiological processes, morphological and phenological events are impaired by water stress. Screening large numbers of rice genotypes is confronted with high cost involved in the techniques and the procedures to quantify the important physiological responses. The use of visual drought scoring has been the common technique widely used in rice and development centers like International Rice Research Institute, Philipines. This experiment was aimed to evaluate drought score as affected by associated physiological responses during water stress, and investigate its effects on dry matter and grain yield. Three trials which included water stress at vegetative growth stage, water stress at grain filling stage and irrigated control were conducted during the 1992 - 1993 summer season at Red/and Bay farm (27° 37' S, 153° 19'E) in south - east Queensland to determine the effect of physiological traits on drought score, hence its affect on the dry matter and Grain yield of eight rice genotypes. Genotypic variation in physiological and morphological responses to water stress was observed. Stress at vegetative growth stage delayed all phenological events (panicle initiation, anthesis, maturity) and consequently extended duration of dry matter accumulation. The development of drought scores was slow during stress at vegetative stage. Genotypes with small plant size and incomplete ground cover had low drought scores, which was associated with slow water extraction hence high leaf water potential. High drought scores contained in genotypes with large leaf area index was due to high radiation load. Dry matter and grain yield however were not determined by the effect of drought score during stress at vegetative stage. Rapid recovery ability and increase leaf area index and radiation interception after relieving stress contributed to high dry matter production and increased grain yield. Stress at grain filling stage resulted in rapid development of drought score which was due to rapid water extraction at 0-20 cm soil depth. Late maturing genotypes were most affected in terms of dry matter production and grain yield by stress during the grain filling stage due to late phenological development. Early maturing genotypes escaped stress due to early phenological development. Large genotypic differences in drought score effected by differences in phenological development, leaf area index, radiation interception and leaf water potential resulted in large differences in grain yield. Drought score had little affect on grain yield and dry matter production. It appears that drought score is not an appropriate criteria to employ in screening rice genotypes jor stress resistance at vegetative stage but could be useful in grain filling or panicle development stage. The differences in drought score during stress at grain filling stage is however more related to rapid retranslocation of assimilates and differences in phenology." @default.
• W167406983 created "2016-06-24" @default.
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• W167406983 date "1993-01-01" @default.
• W167406983 modified "2023-09-26" @default.
• W167406983 title "Evaluation of drought scores on field performance of eight rice (Oryza sativa L.) genotypes for drought resistance using field rain-out shelter" @default.
• W167406983 hasPublicationYear "1993" @default.
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