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Published in Crop Sci 22:459-463 (1982)
© 1982 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Variation and Correlations of Proline Accumulation in Spring Wheat Cultivars1

B. H. Tan and G. M. Halloran2

Water-stressed plants accumulate considerable amounts of free proline in their leaf tissues. The physiological significance of this metabolic response to water deficit is, however, contentious.

Proline accumulation in in vitro-stressed seedling leaf segments and its associations with a number of physiological responses induced by water deficit was studied in 14 wheat (Triticum aestivum L.) cultivars with known drought resistance rankings. The cultivars differed (at P <0.05) in their capacity to accumulate proline, which was also intercorrelated with increases in total catabolic amino acids and sugars during stress.

The study did not corroborate the purported association of high proline concentration in stressed leaf tissues with drought resistance, severity of leaf firing, or post-stress recovery. High relative growth rate of seedlings subjected to moderate water stress was found to be strongly correlated with drought susceptibility.

Key Words: Triticum aestivum L. • Drought resistance • Chlorophyll • Leaf firing • Relative growth rate • Water stress

1 Contribution from the School of Agriculture and Forestry, Plant Sciences Section, Univ. of Melbourne, Parkville, Victoria, 3052, Australia.

2 Former research fellow, Univ. of Melbourne (now research fellow, National Subterranean Clover Breeding Program, Dep. of Agronomy, Univ. of Western Australia, Nedlands, W.A. 6009, Australia) and senior lecturer, School of Agriculture and Forestry, Univ. of Melbourne, Parkville, Victoria 3052, Australia.

Received for publication January 2, 1981.




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