Abstract 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．
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Received: 01 February 2020
Published: 10 June 2020
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