The effect of fluctuating substrate salinity on the yield and flag leaf photosynthesis of wheat.

Beckett, R.P. and Drennan, P.M. and Botha, C.E.J. (1995) The effect of fluctuating substrate salinity on the yield and flag leaf photosynthesis of wheat. South African Journal of Botany, 61 (1). pp. 35-38. ISSN 0254-6299

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Abstract

The effects of constant and fluctuating substrate salinity on flag leaf photosynthesis and grain yield of wheat were investigated. Plants exposed to salinity fluctuating around a mean integrated value of 25 mol m-3 NaCl (0-50 mol m-3) and around 50 mol m-3 NaCl (25-75 mol m-3) had yields 36 and 38% higher, respectively, than those receiving the corresponding constant salinity. Plants treated with salinity fluctuating from 50-100 mol m-3 NaCl had a 14% lower yield than those receiving 75 mol m-3 NaCl. Flag leaf photosynthesis did not vary between treatments and during salinity fluctuations, suggesting that differences in flag leaf longevity caused the observed differences in yield. Results suggest plants grown under constant salinity are unlikely to behave as those in field situations, where fluctuating rather than constant salinity occurs.

Item Type:Article
Uncontrolled Keywords:Triticum aestivum, salinity stress, fluctuations
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Science > Botany
ID Code:317
Deposited By: Ms Vivien Botha
Deposited On:31 Oct 2006
Last Modified:06 Jan 2012 16:17
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