Stout, D.G. and Simpson, G.M. (1978) Drought resistance of sorghum bicolor. 1. Drought avoidance mechanisms related to leaf water status. Canadian Journal of Plant Science, 58 (1). pp. 213-224.
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Abstract
Leaf ψs (osmotic potential) of two Sorghum bicolor (L.) Moench cultivars M35 and NK300 given an irrigation treatment decreased with increasing plant age. Following 3 wk without irrigation, leaf ψs of plants of both cultivars was lower than that in irrigated controls. Following 9 wk without irrigation, leaf ψs of M35 plants was still significantly lower than that in irrigated controls; but in NK300 the difference in leaf ψs between irrigated and non-irrigated plants was no longer significant due to an ageing effect changing leaf ψs less in non-irrigated than in irrigated plants. Evidence indicated that leaf ψs decreased due to osmoregulation, a drought avoidance mechanism, resulting in formation of more osmotically active cellular solutes. Greater leaf senescence of non-irrigated plants is a second drought avoidance mechanism used by sorghum to decrease transpiration requirements. Leaf diffusive resistance measurements indicated open stomata in both irrigated and non-irrigated plants so that under the imposed water stress conditions stomatal closure was not affecting the transpiration requirement
| Item Type: | Article |
|---|---|
| Author Affiliation: | Crop Science Department, University Sask., Saskatoon, Canada |
| Subjects: | Crop Improvement > Genetics/Genomics Crop Improvement > Plant Breeding |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 15 May 2012 10:47 |
| Last Modified: | 15 May 2012 10:47 |
| Official URL: | http://pubs.aic.ca/doi/abs/10.4141/cjps78-031 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5355 |
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