棉纤维发育过程中内源激素含量和过氧化物酶活性的变化及其与纤维素累积和纤维比强度关系的研究

Study on the Correlation between Change of Hormone Content and Perocidase Activity and Cellulose Cumulation and Fiber Strengths during the Cotton Fiber Development

选用纤维比强度差异较大北疆推广品种新陆早10号和新陆早16号，研究纤维发育过程中生长素（IAA）、脱落酸（ABA）含量和过氧化物酶（POD）活性的变化及与纤维素累积和纤维比强度的关系。研究结果表明：纤维中I从含量从花后10d开始升高，花后25-35d达到高峰值，与纤维索累积快速增长期基本吻合。纤维中ABA含最在花后呈双峰曲线变化，2个峰值出现时间分别为花后15-20d和40-45d；第1个峰值过后，纤维素开始大量累积；第2个峰值过后纤维素累积速率显著下降。两峰值之间的ABA含量对纤维素的累积有一定的影响。POD活性变化呈单峰曲线，峰值出现在花后25d左右，其变化趋势与纤维素累积速率的变化趋势基本一致。纤维素累积随着IAA含量和POD活性高峰而进入快速累积期。不同品种间纤维比强度与纤维素最大累积速率、高峰期内的累积量呈显著的负相关（r=-0．829＊和r=-0．845-）。IAA、ABA含量和POD酶活性影响纤维素的累积速率和累积量，进而影响纤维比强度。

The effects of IAA,ABA content and POD activity on the accumulation of cellulose and the quality of fiber strength by Xinluzao 10 and Xinluzao 16 was studied.The results showed that IAA content in fiber rise from 10 day postanthesis（DPA） to 25 - 35 days, and get to a peak value at 25 - 35 DPA. It was approximatdy consistent with the period of fast cellulose accumulation.ABA content in fiber appeared a double curve.The first peak value appears at 15- 20 DPA,the cellulose begins to accumulate largely after the first peak value;the ,second peak value appears at 40-45 DPA,and the cellulose accumulation tends to stop. The activity of POD rises at 15 DPA and get a maximum at 25 DPA, then descends with fiber development, i shows relativity with the cellulose, accumulation rate.The cellulose accumulation gets to a period of peaking with IAA content and POD activity reaching maximum.There was a clear correlation at the fiber strength and the rate and the quality of cellulose accumulation at two different varieties（ r = - 0.829^＊ and r = - 0. 845^＊ ）. The content of IAA, ABA and the activity of POD affected the fiber strength by the rate of cellulose accumulation and the quantity cellulose accumulation.