天然棕色棉色素分布规律及色素合成与纤维发育的关系

The Pigment Distribution Regulation of the Natural Brown Cotton and Relations between Pigment Synthesis and Cotton Fiber Development

通过对三个颜色深浅不同的棕色棉品系纤维的观察,发现中棕色棉色素分布较为典型,按照颜色的深浅不同,可以分为4条带纹;在此基础上,对各发育时期棉铃中纤维颜色的观察、蒸馏水洗脱棉纤维试验、棉子壳和棉纤维中棕色素含量的测定,分析色素在纤维上的分布规律与色素合成、纤维发育的关系,由此推断种皮合成无色的色素前体运输到纤维中,无色的前体在纤维中生成棕色素,按照色素与纤维结合的牢固性,色素与纤维素的结合方式可以分为两种,本试验结果支持纤维扩散生长理论,同时推断纤维的扩散生长不是均匀的;最后通过相关性分析,纤维中的色素含量与单铃重和纤维长度负相关性达到显著水平。

The pigment distribution regulation of the natural brown cotton was analyzed by observing the fiber of three cultivars, whose color had a different hue and saturation. It was found that the pigment distribution of middle-brown cotton was a basic type, which has four bands of color. The relationship of pigment distribution to pigment synthesis or cotton fiber development were studied by observing the fiber color dynamic development, the test of washing fiber by distilled water, determining of pigment content in the fiber and seeds coat. It is concluded colorless precursor of the pigment was synthesized in the seeds coat, and then the precursor was conveyed into fiber cell, where the precursor would be turned into brown pigment. And the link mode of the pigment to the fiber could be divided into two types according to the color fastness. The results supported the diffuse growth theory of cotton fiber elongation, and that diffuse growth was not a uniform continuance. The results also showed that the pigment content in fiber had obvious negative correlations to boll weight and fiber length.