Effects of drought on soluble protein content and protective enzyme system in cotton leaves |
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| Authors: | Dongxiao Li Cundong Li Hongchun Sun Wenxin Wang Liantao Liu Yongjiang Zhang |
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| Institution: | (1) School of Plant Biology M084, The University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia;(2) The International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines;(3) Present address: School of Agricultural Science, The University of Tasmania, Private Bag 54, Hobart, TAS 7001, Australia;(4) Present address: E.H. Graham Centre for Agricultural Innovation, Charles Sturt University, NSW, 2678, Wagga Wagga, Australia; |
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| Abstract: | The effects of soil drought on soluble protein content and protective enzyme system of cotton leaves at different positions
were studied in the transgenic cotton cultivar, Lumianyan28. The results indicated that the soluble protein content in main
stem leaves and in middle-fruit branch leaves under drought treatment were higher than that of CK, the normal soil water management
treatment. Lower fruit branch leaves under drought treatment had higher protein and enzyme levels than CK treatments. From
June 25 to July 22, the activity of superoxide dismutase (SOD) in main stem leaves under drought treatment was lower than
that of CK. Other time periods had varying results. The peroxidase (POD) activity in main stem leaves and in fruit branch
leaves was lower at early stage and then higher at late stage, showing a trend of descending first, and then ascending obviously
under the drought condition. The catalase (CAT) activity showed an increase-decrease trend, higher in main stem leaves under
drought treatment than that of CK. However, it was opposite in the lower fruit branch leaves, and there were no significant
differences between the two CAT treatments in the middle branch leaves. It is suggested that the soluble protein and cellular
protection enzymes, such as superoxide dismutase, peroxidase activity, and catalase in main stem leaves and fruit branching
leaves play important physiological functions in the early growth stage under drought stress. |
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