缩合单宁与天然棕色棉纤维色素合成的关系

Relationship between the Pigment in Natural Brown Cotton Fiber and the Condensed Tannin

以白色棉为对照,采用香草醛法测定了4种天然棕色棉种皮细胞和棉纤维细胞发育过程中缩合单宁含量的变化规律。结果表明,各发育时期棕色棉纤维中缩合单宁的平均含量是白色棉的4.35倍,在4个棕色棉品种中,棕色棉成熟纤维色素与发育过程中棉纤维中缩合单宁的含量呈现正相关;各发育阶段棕色棉种皮中缩合单宁平均含量是白色棉的1.44倍,且在棕色棉品种中,颜色越深,种皮中缩合单宁的含量越高;不论是棕色棉还是白色棉,种皮中的缩合单宁含量都大于相应的棉纤维细胞中的缩合单宁的含量。成熟纤维中色素的含量与20-25DPA棉纤维中缩合单宁的含量、棉纤维中缩合单宁总平均含量极显著相关。

The dynamic contents of condensed tannin in four kinds of naturally colored cotton fiber by Vanillin-method and the contents of the pigment in matured cotton fiber were determined in contrast with one conventional white cotton, Simian 3. The results indicated the mean content of the condensed tannin in the fiber of the naturally colored cotton were 4.35 times than that of the conventional white cotton, and the contents of the pigment in mature cotton fiber had a positive correlation with the mean contents of the condensed tannin. The dynamic contents of condensed tannin in seed coats of the five cotton cultivars were analyzed. The analyzing results showed the mean content of the condensed tannin in the seed coats of the naturally colored cotton was 1.44 times than that of the conventional white cotton. The more the pigment contents in the mature cotton fiber, the more the content of condensed tannin in the cotton seed coats among the naturally colored cotton varieties. The pigment contents in the mature cotton fiber had significant correlation with the contents of condensed tannin in colored cotton fiber during 20-25 DPA and the mean contents of the condensed tannin（p〈0.01）.