
TY  - JOUR
A1  - Wright, GC 
A1  - Smith, RCG 
A1  - Morgan, JM 
T1  - Differences between two grain sorghum genotypes in adaptation to drought stress. III. Physiological responses
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 1983
VL  - 34
IS  - 6
SP  - 637
EP  - 651
KW  - 
UR  - https://doi.org/10.1071/AR9830637 
N2  - A sorghum hybrid (E-57) giving a higher yield under rain-fed systems of production was studied to examine the physiological basis of this effect. A comparison was made with another hybrid (TX-671) with similar maturity. E-57 was able to maintain stomatal opening to a lower leaf water potential than TX-671 because of its greater capacity to osmoregulate. In E-57 osmotic potential declined due to active solute accumulation, thus maintaining turgor as leaf water potential declined to - 2.0 MPa. In contrast, TX- 671 could only maintain this adjustment to - 1.4 MPa. The differences in osmoregulation were associated with maintenance of leaf area, water extraction and possibly root growth by E-57. This indicated that osmoregulation enabled photosynthesis to continue and that a significant amount of the resultant assimilate may have been diverted to root growth. 
ER  -

