Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (1): 37-48.doi: 10.16420/j.issn.0513-353x.2020-0251

• Research Papers • Previous Articles     Next Articles

Comparative Analysis of the Photosystem Activity of Triploid Loquats and Their Tetraploid,Diploid Parents

LIU Mingxiu1,2, WANG Hongding1, ZHANG Yuna1, ZHANG Bangyan1, LIU Song1, LI Yunjia1, DANG Jiangbo1, HE Qiao1, LIANG Guolu1, GUO Qigao1,**()   

  1. 1College of Horticulture and Landscape Architecture,Southwest University,Chongqing 400715,China
    2College of Animal Science and Technology,Southwest University,Chongqing 400715,China
  • Received:2020-09-23 Revised:2020-12-23 Online:2021-01-25 Published:2021-01-29
  • Contact: GUO Qigao


In order to explore the characteristics of photosynthetic efficiency and photosystem activity of triploid loquat,the triploidy progeny F1(2n = 3x = 51)of B431 × GZ1 and B431 × GZ23,and their corresponding parents B431(2n = 4x = 68),GZ1 & GZ23(2n = 2x = 34)were used to determine net photosynthetic rate(Pn),the OJIP curve,then OJIP curve was analyzed by JIP-test in March,July,December of two consecutive years(2018-2019). The results showed that the Pn of two triploid loquats was significantly higher than that of their diploid paternal parents,respectively;there was no significant difference with that of tetraploid maternal parent in July,and the difference with tetraploid maternal parent varied with different hybridized combination in March,December. And the difference of Pn may be mainly related to non-stomatal restriction factors. The JIP-test analysis showed that triploid loquat F1 had higher ABS/CSm,TRo/CSm,ETo/CSm and REo/CSm,PIabs,Fv/Fm and lower DIo/CSm ratio than their diploid paternal parents,respectively;while there was no significant difference with that of tetraploid maternal parent. Therefore,the higher activity of the triploid photosystem is a basic reason for its higher light utilization efficiency and regulation ability.

Key words: loquat, triploid, net photosynthetic rate, photosystem, the fast chlorophyll fluorescence induction kinetics

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