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Photosynthetic Characteristics of Two New Chlorophyll b-Less Rice Mutants
Authors:Lin  Zhi-Fang  Peng  Chang-Lian  Lin  Gui-Zhu  Ou  Zhi-Ying  Yang  Cheng-Wei  Zhang  Jing-Liu
Institution:(1) South China Institute of Botany, Chinese Academy of Sciences, Guangzhou, 510650, P. R. China;(2) National Key Laboratory of Plant Molecular Genetics, Institute of Plant Physiology & Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, P.R. China
Abstract:Two yellow rice mutants VG28-1 and VG30-5 were obtained during the tissue culture process from a rice plant (cv. Zhonghua No.11 japonica) with inserted maize Ds transposon element. Absorption spectra and pigment composition showed that two mutants had no chlorophyll (Chl) b and lower Chl a content in comparison to the wild type (WT). Net photosynthetic rate (P N), total electron transport rate (JF), photochemical quenching (qp), quantum yield of PS2 dependent non-cyclic electron transport (PHgrPS2), fraction of Prate, and leaf area were lower but Fv/Fm and apparent quantum yield (AQY) remained at similar levels as in the WT plant. Xanthophyll cycle pool size (V+A+Z) on a Chl basis, and de-epoxidation state were enhanced in the mutants. The mutants had larger amounts of soluble protein and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO), especially the small subunit of RuBPCO, than WT. The characteristics of two rice mutants differed somewhat from the other common Chl b-less mutants originating from mutagenic agent treatments.
Keywords:chlorophyll absorption spectrum  chlorophyll accumulation and degradation  carotenoids  photosystem 2 activity  ribulose-1  5-bisphosphate carboxylase/oxygenase  thermal dissipation  total electron transport rate
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