干旱对棉花叶片碳水化合物代谢的影响

以3个不同铃重的棉花基因型为材料,研究了土壤干旱对棉叶碳水化合物代谢的影响.结果表明,干旱胁迫使主茎叶片与不同部位内围果枝叶片可溶性糖含量均有不同程度的增加,而淀粉的积累受到明显抑制.虽然干旱条件下不同基因型棉叶的可溶性糖与淀粉含量的变化趋势一致, 但小铃基因型开花 (7月5日)后的主茎叶可溶性糖含量较中、大铃基因型变化小,淀粉含量则低于大铃基因型.上部内围果枝叶淀粉含量在棉铃发育过程中波动明显大于中、下部果枝,而小铃品种相对稳定.研究结果加深了对干旱胁迫下棉叶碳水化合物时空变化特征的认识.

Effect of Water Stress on Carbohydrate Metabolism in Cotton with Varying Boll Size

Three genotypes of cotton varieties with different boll weight,small-boll varieties Ceheng Damianhua(single boll-weight 3.98 g),middle-boll varieties NuCotn 33B(single boll-weight 4.91 g) and big-boll varieties Sumian 9108(single boll-weight 7.90 g),were studied under different water treatments.The water stress treatments were carried out in the waterproof installations and repeated 3 times.The irrigation time was determined by water percent measured in the field.After irrigation,the earth RWC in almost cotton growth time was controlled below 60% in the soil layer 20~80 cm;the CK was managed according to high yield management.The soil water percentage was examined by method of oven-dry weight loss,including different soil layer: 0~20 cm,20~40 cm, 40~60 cm and 60~80 cm.In order to prevent water from exchanging in landscape orientation,before seeding,the 60cm-long plastic was buried in the field between the drought management and the CK,and was buried around the drought treatment.The paper analyzed the effect of drought stress on carbohydrate metabolism of these materials.The results were that: under water stress,the soluble sugar content of main stem and different branch leaves increased to different levels,and the starch accumulation were restrained significantly.Although the changing trend of soluble sugar and starch of different boll weight genotypes materials are the same,after flowering stage(July 5th),the change of soluble sugar content of small-boll materials is more stable than middle-boll and large-boll materials,and the starch content is less than that ot large-boll materials.In the growing stage,the changing trend of starch content in top branch leaves is more obvious than that in middle and bottom branch leaves in big-boll and middle-boll materials,except the small-boll materials.The result indicated the spatial-temporal character changes with carbohydrate metabolism of cotton leave under water stress conditions.