棉花纤维发育后期纤维素形成过程的研究

Study on the Formation of Cellulose in the Late Stage of Cotton Fiber Development

1989年～1990年选用陆地棉(G.hirstum L.)北农1号品种(BAU No.1)和海岛棉(G.barbadense L.)海7124品种(Hai—7124)为材料,对棉花纤维发育后期的纤维素形成过程进行了研究。结果表明:随着纤维的发育还原性糖含量逐渐下降,纤维素含量逐渐上升。其含量变化高峰期出现的顺序为:还原性糖——纤维素。开花后45天左右(40 DPA～50 DPA)是棉纤维发育后期的一个重要的生化代谢转折期。温度与还原性糖含量的变化率、纤维素含量的变化率呈极显著正相关(分别为 r=0.837^(**)和 r=0.972^(**))。低温对纤维素合成的抑制作用是通过抑制还原性糖的提供而限制纤维素沉积量的累积的。

The formation of cellulose in the late stage of cotton füber develop- ment on G.hirstum L.(BAU No.1) and G.barbadense L.(Hai-7124)was studied in 1989～1990.The results are summaried as follows:the Reducing Sugar Cont- ent was gradally decreasing while Cellulose Content increasing.The sequence of the peak of these change rates was:Reducing Sugar Content--Cellulose.the 45 days postanthcsis (40 DPA～50 DPA) was a critical stage of biochemical ch anges.The correlation beLwccn temperature & change rate of Reducing Sugar ContenL,and temperature & change rate of Cellulose Content were all signifi- cant at 1 prcent level with coeffcients being 0.837,0.972 respectively.The inhibiLion of low Lemperature on cellulose synthesis is duc to the inhibition on transrer of reducing sugar to fübers.Low temperature,as a result,finally in- hihited the cellulese formation.