The Endogenous Hormone Differences of Different Fruiting Branch Internode Length Traits and the Influence of Spraying Exogenous Hormone in Upland Cotton

Objective] It is of great significance for shaping plant architecture, strengthening the research on cotton fruiting branch internode length. Method] In this research, two upland cotton materials Zhong2549(long branch internode) and Zhong5081(short branch internode) were used for the study of the endogenous hormone differences by measuring endogenous hormone of the fruiting branch internode of Zhong2549 and Zhong5081; and for the study of the influence to the internode length by spraying exogenous hormone to Zhong2549 and Zhong5081. The paraffin section technique was used to detect the cell morphology of the fruiting branch internode of Zhong2549 and Zhong5081. Result] that the content of endogenous hormone IAA, GA3 and ABA in Zhong2549 were apparently higher than its in Zhong5081. Spraying exogenous hormone IAA, GA3 and ABA promoted the fruiting branch internode elongation. The section result showed that the cell size of Zhong549 was bigger than Zhong5081, and the cell density of Zhong2548 was less than Zhong5081. These indicated that the endogenous hormones which affect the fruiting branch internode length and the differences of different length fruiting branch internode in cellular level. Conclusion] This study can provide some foundation and reference for the later research.