Salt and drought stress in wheat and the role of abscisic acid
2003
Bano, A. | Aziz, N.,Quaid-e-Azam Univ., Islamabad (Pakistan). Dept. ofBiological Sciences
The effects of different concentrations (150 mM and 300 mM) of NaCl aloneor in combination with drought stress were determined on six wheat varieties.Among them, four varieties viz. E-38, E-37, E-2 and E-30 were newly released,whereas Lu-26 and Pasban-90 were commercial varieties. The plants weregrown in pots under natural conditions with protective measures against rain.Drought was induced for 7d to salt stressed plants at three-leaf stage bywithholding the supply of salt/water (in case of control). The response of saltand drought were studied on growth parameters and yield of wheat. Theproline contents of leaves and the concentration of abscisic acid andgibberellic acid were also measured at three leaf stage. The increasingconcentration of NaCl had a significant inhibitory effect on the growthparameters. Relatively sensitive varieties i.e. Pasban-90 and E-38 weremarkedly affected, whereas, the relatively tolerant varieties Lu-26 and E- 30were the least affected by either concentration of NaCl and performed betterwith respect to both yield parameters and biochemical characteristics, Thecombined effect of salt and drought was more inhibitory than salt alone. Boththe proline and ABA contents were greater in Lu-26 and in E-30 treated with300 mM NaCl. The role of ABA and proline in salt and drought stress has beendiscussed.
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