不同分枝西瓜品种生长过程中内源激素含量的变化

以多分枝西瓜品种陇抗9 号与不分枝西瓜品种无杈早为试材，采用超高效液相色谱串联质谱的分析方法，研究分 析不同分枝西瓜品种生长过程中引哚甲酸（ICA）、引哚乙酸（IAA）、玉米素（Z）、二氢玉米素（DHZ）、脱落酸（ABA） 等内源激素含量的变化。结果显示，在伸蔓期与果实膨大初期，不分枝西瓜品种叶片中ICA、IAA+ICA 含量显著高于多分 枝西瓜品种；在整个生长期，不分枝西瓜品种叶片中Z、DHZ+Z 含量低于多分枝品种；且不分枝西瓜品种的（ICA+IAA）/ （Z+DHZ）、（ICA+IAA）/ABA、（ICA+IAA）/（GA1+GA3+GA4+GA7）在伸蔓期与果实膨大初期显著高于多分枝品种。由此 可见，较高含量的ICA 对西瓜侧枝的分生有抑制作用，较高含量的Z 与DHZ 对西瓜侧枝的形成有促进作用；（ICA+IAA）/ （Z+DHZ）、（ICA+IAA）/ABA、（ICA+IAA）/（GA1+GA3+GA4+GA7）的较高比值不利于西瓜侧枝的形成。

Changes of Endogenous Hormone Content in Watermelon Varieties with Different Branching Forms During Their Growth Process

Taking multi-branch watermelon variety ‘Longkang No.9’ and no branch watermelon variety ‘Wuchazao’ as experimental materials，this paper studied and analyzed the changes of endogenous hormone content，including Indole-2-carboxylic acid（ICA），indole-3-acetic acid（IAA），zeatin（Z），dihydrozeatin （DHZ），abscisic acid（ABA），gibberellin（GA1，GA3，GA4 and GA7） by HPLC-MS/MS during watermelon growth period．The results showed that the contents of ICA，ICA+IAA in watermelon leaves of no branch variety were significantly higher than that of multi-branch variety during vine spreading period and fruitexpanding early stage．During the whole growth period，the contents of Z，DHZ+Z in no branch variety were lower than that of multi-branch variety．Furthermore，the ratios of （ICA+IAA）/（Z+DHZ），（ICA+IAA）/ ABA，（ICA+IAA）/（GA1+GA3+GA4+GA7） in no branch variety were significantly higher than that of multibranch variety during vine spreading period and early stage of fruit expanding．Thus，it could be seen that higher contents of ICA could inhibit the branching of watermelon side shoots；while the higher content of DHZ and Z could promote the form of watermelon lateral branches．The higher ratios of（ ICA+IAA）/（Z+DHZ）， （ICA+IAA）/ABA，（ICA+IAA）/（GA1+GA3+GA4+GA7） were harmful to the formation of water melon branches．