Genotypic variation in osmotic adjustment in grain sorghum, 2. Relation with some growth attributes
1991
Tangpremsri, T. | Fukai, S. | Fischer, K.S. (Queensland Univ., St Lucia (Australia). Dept. of Agriculture) | Henzell, R.G. (Queensland Dept. of Primary Industries, Warwick (Australia). Hermitage Research Station)
Two sets containing large numbers of sorghum genotypes were grown in the glasshouse to examine the effect of osmotic adjustment on water extraction, dry matter growth and grain yield. Water stress was developed in 2 periods, 1 before and 1 after anthesis. Osmotic adjustment was positively associated with green leaf area retention during grain filling and to root length density at 70 cm depth. Genotypes with high osmotic adjustment used more water during the second drying period. As a result, total dry matter was well related to osmotic adjustment during grain filling, but grain yield was negatively associated with osmotic adjustment in 1 experiment, and not related in the other. There was still a positive effect of osmotic adjustment on total dry matter when comparison was made between lines that had similar leaf water potential during early growth but which differed in osmotic adjustment during grain filling, suggesting that the positive effect was not caused by large plants extracting more water in early growth, but was due to ability to extract water during grain filling.
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