Changes of endogenous hormone contents in fruits of two Actinidia arguta varieties(lines)during fruit development
[Objective]This study aimed to clarify the changes of endogenous hormone and fruit growth dynamics of two Actinidia arguta varieties(lines)during fruit development,and preliminarily explore the effects of endogenous hormones on fruit growth and harvest time.[Method]Using the 5-year-old trees of'Longcheng 2'and'Haijia'as test materials,the morphological characteristics of the fruits were dynamically measured from 25 days after pollination.The changes in endogenous hormone contents in the fruits were also analyzed using liquid chromatography-triple quadrupole mass spectrum(LC-QQQ-MS)technology.[Result]During fruit development,the single fruit mass,longitudinal diameter,transverse diameter and side diameter of'Longcheng 2'exhibited a relatively obvious"fast-slow-fast"growth pattern.However,compared to'Longcheng 2','Haijia'had no obvious slow growth period.At 25 days after pollination,the fruit shape indexes of'Longcheng 2'and'Haijia'were 1.95 and 1.59 respectively.Afterwards,both of them showed a downward trend with basically the same degree of decrease,indicating that the difference in fruit shape between the two varieties(lines)had already existed before 25 days after pollination.In terms of endogenous hormones,the peaks of tZ and IAA in'Longcheng 2'appeared during the first rapid growth stage,while the peak of GA3 occurred during the second rapid growth period.The contents of tZ,IAA and GA3 in'Haijia'all reached their peak values at 65 days after pollination.Compared with'Longcheng 2'which was relatively late in harvest,the ABA content of'Haijia'was lower in the early stage of fruit development,but increased earlier and higher in the middle and late stages of fruit development.The correlation analysis showed that IAA,especially IAA/ABA,played an important role in the fruit growth of the two varieties(lines),which was also consistent with the higher single fruit quality and peak value of IAA in'Longcheng 2'.[Conclusion]In general,there are some differences in the peak values and occurrence time of the same endogenous hormone between the two varieties(lines).It may be one of the main reasons for the earlier fruit maturity that the ABA content of'Haijia'fruit rapidly increases in the middle and late stages of fruit development.Compared with the absolute contents of endogenous hormones,the correlation between the ratio of their contents and fruit growth is higher,indicating the importance of their balance relationship for fruit development.
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