›› 2017, Vol. 29 ›› Issue (9): 1506-1514.DOI: 10.3969/j.issn.1004-1524.2017.09.12

• Horticultural Science • Previous Articles     Next Articles

Effect of different degrees of etiolation on growth and photosynthesis of hybrid citrus

XIONG Bo1, YAN Qiaoqiao2, SUN Guochao1, QIU Xia1, YE Shuang1, LIAO Ling1, LUO Jinyu1, DAI Lin1, WANG Zhihui1, *   

  1. 1. College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China;
    2. Sichuan Engineering Technical College, Deyang 618000, China
  • Received:2017-03-20 Online:2017-09-20 Published:2017-09-27

Abstract: In order to study the effect of different etiolation degrees on Citrus seedling growth and photosynthesis, Citrus cultivars Huangguogan and Shiranuhi seedlings were used as the materials, to analyze the changes of seedling biomass, chlorophyll content, photosynthetic parameters and chlorophyll fluorescence characteristics of etiolated, multicoloured and green seedlings. The results showed that the normal growth of Citrus cultivars Huangguogan and Shiranuhi seedlings was inhibited by etiolation, and the growth of etiolated seedlings was significantly lower than that of green seedlings. The contents of free proline (Pro), malondialdehyde (MDA), soluble sugar (SS) and soluble protein (SP) were significantly increased in the leaves of etiolated seedlings. Seedling etiolation could significantly reduce the content of chlorophyll a, chlorophyll b, carotenoid and photosynthetic gas exchange parameters (stomatal conductance, intercellular CO2 concentration, transpiration rate), and change the composition ratio of the chlorophyll. Maximal photochemical efficiency (Fv/Fm), photochemical quenching (qP), and non-photochemical quenching (NPQ) of etiolated seedlings were significantly lower than those of green seedlings, but the Fv/Fm of multicoloured seedlings was decreased slightly. This study indicated that seedling etiolation inhibited the normal growth and photosynthetic capacity of Citrus seedlings.

Key words: Huangguogan, Shiranuhi, etiolation, seedlings, photosynthesis

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