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- Title
Physiological and transcriptomic analyses of a yellow-green mutant with high photosynthetic efficiency in wheat (<italic>Triticum aestivum</italic> L.).
- Authors
Wang, Yu; Zheng, Wei; Zheng, Weijun; Zhu, Jianchu; Liu, Zhenshan; Qin, Jinxia; Li, Hongxia
- Abstract
Optimizing the antenna size by reducing the chlorophyll (Chl) content is an effective strategy to improve solar energy conversion efficiencies in dense crop monocultures. To elucidate the physiological and molecular mechanisms that regulate Chl biosynthesis and understand the effects of lower Chl content on the photosynthetic process, a light-intensity-dependent yellow-green wheat mutant (<italic>Jimai5265yg</italic>) was characterized to determine its morphological, histological, physiological, and transcriptional differences with wild type. In addition to lower Chl content with a higher Chl a/b ratio, <italic>Jimai5265yg</italic> has spherical chloroplasts with few plastoglobule. It is counterintuitive that the photochemical quantum yield of both photosystem I and photosystem II and the following CO2 assimilation rate significantly increased, but the value of nonphotochemical quenching decreased, indicating a reduction of the photoprotective capacity of this yellow-green mutant. Analysis of intermediate pools and the expression of genes in the Chl synthesis pathway indicated that Mg-protoporphyrin IX (Mg-Proto IX) synthesis was partially blocked due to the imbalanced expression of Mg-chelatase subunits. Interestingly, the expression of photosynthesis-associated nuclear genes (PhANGs) was upregulated, resembling <italic>gun</italic> mutants which have defects in the Mg-Proto IX-mediated plastid-to-nucleus signaling pathway. A genetic analysis indicated that the yellow-green phenotype was controlled by two nuclear recessive genes located on chromosomes 4AL and 4BL. <italic>Jimai5265yg</italic> is a novel chlorina mutant which could be used for understanding photosynthesis improvement mechanisms.
- Subjects
WHEAT; CHLOROPHYLL synthesis; PHOTOSYNTHESIS; CHROMOSOMES; CHLOROPLASTS; PHOTOSYSTEMS
- Publication
Functional & Integrative Genomics, 2018, Vol 18, Issue 2, p175
- ISSN
1438-793X
- Publication type
Article
- DOI
10.1007/s10142-017-0583-7