Effects of continuous high-temperature on flowering and fruit-setting habits and photosynthesis of four passion fruit varieties
[Objective]The study aimed to provide theoretical reference for the rapid screening of breeding materials of passion fruit for high-temperature tolerance and summer planting layout in Guangxi.[Methods]The passion fruit varieties Qinmi No.9,Xiaohuangjin,Tainong No.1 and Man-tianxing were chosen as research material.When the maximum daily temperature exceeded 32 ℃ for 5 consecutive days,the flowering,fruit setting rate and photosynthesis of the 4 passion fruit varieties were investigated in the orchards of Nanning and Guigang.The four-point sampling method was used to randomly select 5 healthy passion fruit plants with the same growth trend in 4 growth directions from 4 regional centers divided by diagonal lines to observe flowering and fruit setting.Simultaneously,the photosynthetic data of passion fruit were obtained by LI-6400XT portable photosynthesis measurement system.Subsequently,the statistical software was used to compare the differences in flowering,fruit set-ting,and photosynthesis of 4 passion fruit varieties under continuous high-temperature conditions,and then the heat resistance of the 4 passion fruit varieties was evaluated.Meanwhile,the Pearson correla-tion coefficient was used to explore the potential relationship between flowering,fruit setting,and pho-tosynthesis of the 4 passion fruit varieties.[Results]Qinmi No.9 had the strongest flowering,fruit set-ting,and photosynthesis,followed by Xiaohuangjin and Tainong No.1,and Mantianxing had the weak-est performance in both orchards.All parameters showed significant differences among varieties except for a few parameters that showed significant differences between the different orchards(p＜0.05).Qinmi 9 had more nodes,flowers,buds,and fruits than Xiaohuangjin,Tainong No.1 and Mantianxing.Qinmi No.9 had higher net photosynthetic rate(Pn)Xiaohuangjin,Tainong No.1 and Mantianxing.Qinmi 9 had higher stomatal conductance(G,)than Xiaohuangjin,Tainong No.1 and Mantianxing.Qinmi 9 had higher intercellular CO2 concentration(Ci)than Xiaohuangjin,Tainong No.1 and Mantianxing,and had higher transpiration rate(T)Xiaohuangjin,Tainong No.1 and Mantianxing.[Conclusion]Compared with the other three varieties,Qinmi No.9 has stronger heat resistance,and could be used as main vari-ety to grow in Guangxi,or planted with other varieties.It also could be used as a fine parent material for future heat-resistance breeding.
Passion fruitHigh temperatureFlowering and fruiting habitsPhotosynthetic
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