棉 花 学 报    Cotton Science   2008 ， 20(5) ： 342-347

Relationship between Fiber Strength and Activity of Fiber Development Related Enzyme in Cotton Seasonal Boll
ZHANG Wen-jing^1，2，ZHOU Zhi-guo^2*，HU Hong-biao²，WANG You-hua²
(1. College of Agronomy , Anhui Agricultural University , Hefei 230036, China ; 2. Nanjing Agricultural University / Key Laboratory of Crop Growth Regulation , Ministry of Agriculture , Nanjing 210095, China)

Abstract：By choosing four cultivars with significant difference in fiber strength as materials, we studied the relationship between fiber strength and activity of enzymes associated with cotton fiber development in cotton seasonal boll (pre-summer boll, summer boll, early autumn boll and later autumn boll). The results showed that the activities of POD and IAA oxidase promoted with anthesis date postponing, while the activities of sucrose synthetase and β-1,3-glucanase declined. In PSB (pre-summer boll) and SB (summer boll) fiber, the higher activities of related enzyme they had, the better characteristic cellulose deposition and the higher strength fiber they got. The EAB (early autumn boll) had higher activities of key enzymes and better cellulose deposition characteristic than PSB, and EAB had higher fiber strength than PSB in the end. In LAB (later autumn boll) fiber, the activity peaks of related enzymes delayed with the temperature got lower than 20 ℃ and cotton plant was senescing, and these resulted in lower strength fiber formation. Cotton seasonal bolls had differences in enzyme activities and cellulose deposition. And these physiological differences might be one important reason for different fiber strength formation in cotton seasonal bolls.
Key words：cotton seasonal boll; fiber development; related enzyme; fiber strength
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