遮光对彩色棉的色泽及纤维品质的影响

Influences of Boll Shading on Fiber Color and Fiber Quality of Colored Cotton

通过对棕色棉和绿色棉不同发育时期棉铃的遮光处理，研究了遮光对彩色棉的纤维色泽和纤维品质的影响。结果表明，棕色棉和绿色棉在-5～55DPA（开花后的天数）遮光后，其纤维还表现各自的纤维色泽，但其纤维色泽鲜艳度和稳定性在不同遮光时期有一定程度的差别。棕色棉在25DPA以前遮光的纤维颜色比对照变淡；绿色棉在不同生育期遮光后颜色比对照深。遮光对彩色棉和白色棉纤维品质的若干指标有一定的影响，在5～15DPA遮光的纤维都比不遮光的对照粗，在30DPA遮光的纤维长度和强度都较好，35DPA以后遮光的纤维长度和强度随遮光时间的延长越来越差，在45～50DPA套袋遮光后的纤维长度、强度和整齐度都比不遮光的要低得多。

Colored cotton is a kind of cotton with natural color in its fiber. But the poor fiber quality and lower lint percent of the colored cotton restrict its production and commercial utilizing. In recent years, some research has been done on the improvement of the cultivars of colored cotton, and some progresses have been acquired. But the limited color types and the instability of the fiber color of some varieties are the obstacle for development of colored cotton. The main factors which influence the color of the cotton fiber have not been illuminated. In this article, two brown lines （B263S08 and brown 1-61）, two green lines （CC28 and S9708）,and white fiber control TM-1 were grown and investigated in Anyang, Henan, China in 2004. The intraday flower of every line was tagged and covered with the black bag from-5 to 55 day post anthesis （DPA） respectively. After their bolls opened completely, the fiber was picked up and the fiber color observed. The MICROTEK Phantom 9800XL scanner was used to measure the value of redness ,greenness, blueness in the fiber of each treatment by the parameters of r/（g＋b）,b/（r＋g）, g/（r＋b）. The fiber samples was also sent to test the fiber quality on the HVI900. The data was analyzed by SPSS 11.0. The results showed that the brown and green colors of the fibers maintained their primary colors after their boll shading from-5 to 55 day post anthesis （DPA）. However the brightness, deepness and the stability of the color fibers in various shading periods were different. The color trol ,while the of the brown cotton being shaded before 25 DPA was slight lighter than that of the concolor of the green cotton after boll shading in different periods were darker than the control.Sading had.influenced the fiber quality of the white and colored cotton. The fiber being sha- ded from 5-15 DPA was thicker than that of the control. The fiber length and strength with boll shading at 30 DPA were better than those of the control. Shading after 30 DPA, the fiber length, strength and uniformity became worse and worse until they got the weakest quality at 45- 50 DPA. This research is significant to stabilize the fiber color and improve the fiber quality.