PSⅡ Function and Intrinsic Characteristics of Light-harvesting Pigment Molecules for Sun- and Shading-leaf in Magnolia grandiflora During Overwintering

doi:10.7525/j.issn.1673-5102.2017.02.017

Abstract

Abstract: Light absorption and energy transfer are determined by intrinsic characteristics of light-harvesting pigment molecules, which also have impacts on distribution of excited energy for photochemical reaction, heat dissipation and chlorophyll fluorescence. We compared the differences of the PSⅡ function and intrinsic characteristics of light-harvesting pigment molecules of sun- and shading-leaves to study the photoprotective strategies in overwintering Magnolia grandiflora. The slight photoinhibition was caused in leaves of M.grandiflora by low temperature during overwintering. Natural sunlight enhanced photoinhibition in sunleaf, however, low light condition was propitious to the recovery of photoinhibition in shading-leaf. Sun-leaf had lower chlorophyll content and the numbers of light-harvesting pigment molecules(N₀) to reduce light energy absorption. Sun-leaf also possessed higher photochemical function and thermal energy dissipation in PSⅡ, which would protect photosynthetic apparatus against damage by low temperature and high light. Shading-leaf exhibited lower capability of photochemical reaction, however, possessed greater thermal energy dissipation, which would alleviate photoinhibition of shadingleaf under temporal high light condition during overwintering.

Key words: Magnolia grandiflora L., overwintering, PSⅡ function, intrinsic characteristics of light-harvesting pigment molecules, photoprotective strategies

CLC Number:

Q945.79

HU Wen-Hai, YE Zi-Piao, YAN Xiao-Hong, YANG Xu-Sheng. PSⅡ Function and Intrinsic Characteristics of Light-harvesting Pigment Molecules for Sun- and Shading-leaf in Magnolia grandiflora During Overwintering[J]. Bulletin of Botanical Research, 2017, 37(2): 281-287.

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