Wheat [Triticum aestivum] cultivar differences in photosynthetic response to low soil water potentials, 2: Maintenance of leaf turgor and relative water content
1996
Xu, H.L. (Tokyo Univ. (Japan)) | Ishii, R.
The capacity for maintenance of turgor potential (Psi-P) and relative water content (Xi) were examined in 16 wheat cultivars from different habitats with different agronomic drought resistance and different photosynthetic responses to water stress. Substantial cultivar differences in Psi-P and Xi maintenance were observed at all of the seedling, booting and g rain filling stages. Maintenances of Psi-P and Xi positively correlated with photosynthetic maintenance under water deficit conditions, suggesting that capacity of Psi-P and Xi maintenance can be used as drought resistance criteria. In general, the cultivars can bring their abilities of Psi-P and Xi maintenances through the whole growth period,but the abilities were higher at the grain filling stage than the earlier growth stages. With comparison of water-stress resistant cultivars, it was found that some of them could maintain higher photosynthetic activity at lower Psi-P or xi than the others. Integrated results of the present research suggest that turgor regulation and Xi maintenance play important roles in photosynthetic maintenance under low soil water potentials
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