Effect of Indole 3 acetic Acid and Gibberellic Acid as Foliar Spraying Agents on Physiological Characters of Wheat Seedlings Under Dry Soil Conditions

doi:10.3321/j.issn:1000-7091.1998.03.004

Abstract

Abstract: Spraying the leaves of wheat seedlings with 2×10 -5 mol/L of indole 3 acetic acid (IAA) and 5×10 -4 mol/L of gibberellic acid (GA 3) under dry soid conditions may inhibit the activities of phosphoenolpyruvate carboxylase (PEPCase),peroxidase (POD)and catalase(CAT).When the wheat leaves were treated with IAA,the superoxide dismutase (SOD) activity and the chlorophyll content were increased significantly, while the stomatal resistance and water potential were affected little under the same experimental conditions.GA 3 could decrease SOD activity,and no effect on the chlorophyll content ,stomatal resistance as well as water potential were slightly changed. These results showed that IAA and GA 3 could play a less favorable role in plant resistance to drought. It is evident indirectly that drought induced degradation of IAA and GA 3 in plants may be an adaptation to drought.

Key words: Indole 3 acetic acid, Gibberellic acid, Soil drought, Wheat, PEPCase, Protective enzyme

CLC Number:

S512.1

Dong Yonghua， Shi Jiping， Shang Zhenqing， Li Guangmin. Effect of Indole 3 acetic Acid and Gibberellic Acid as Foliar Spraying Agents on Physiological Characters of Wheat Seedlings Under Dry Soil Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1998, 13(3): 18-22. doi: 10.3321/j.issn:1000-7091.1998.03.004.

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