Os11g0102200

The rice gene Os11g0102200 was reported as phot1a in 2009^[1] by researchers from Korea.

Annotated Information

The defect of Os Phot1a affects degradation of chlorophylls and carotenoids, and under photosynthetically active photon fluxes, mutation of phot1a results in loss of photosynthetic capacity owing to the damage of photosystems caused by elevated H2O2 accumulation, leading to a reduction in plant growth.

When phot1a mutants were grown under WL (100) and BL (40 lmol m-2 s-1), they demonstrated a considerable reduction in photosynthetic capacity, which included decreased leaf CO2 uptake and plant growth.
Pigment analysis showed no significant difference between wild-type and mutants in the Chl a:b ratios, whereas in the latter, total concentration was reduced (a 2-fold decrease). Carotenoid contents of the mutants were also decreased considerably, implying the involvement of phot1a in pigment degradation.
Deletion of phot1a showed higher contents of H2O2 in leaves. Chloroplastic APX and SOD activities were lower in the mutants whereas the activities of cytosolic enzymes were increased.
Immunoblotting indicated reduced accumulation of photosystem proteins (D1, D2, CP43, Lhca2, and PsaC) relative to the other light-harvesting complexes in the mutant.

Fig. 2 Growth phenotype of wild-type and phot1a mutant plants. ^[1].

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Environmental Biotechnology and Research Center, Gyeongsang National University, Jinju 660-701, South Korea
Research Institute for Basic Sciences, Cheju National University, Jeju 690-756, South Korea
Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, South Korea
Department of Wood Science and Technology, BK21 Program, Chonnam National University, Gwangju 500-757, South Korea
Department of Molecular Biology, Pusan National University, Busan 609-735, South Korea
Department of Biology, Kyungpook National University, Daegu 702-701, South Korea
Department of Biology, Chungnam National University, Taejon 305-764, South Korea

↑ ^1.0 ^1.1 Goh CH, Jang S, Jung S, Kim HS, Kang HG, Park YI, Bae HJ, Lee CH, An G. Rice phot1a mutation reduces plant growth by affecting photosynthetic responses to light during early seedling growth. Plant Mol Biol. 2009 Mar;69(5):605-19. doi: 10.1007/s11103-008-9442-1. PubMed PMID: 19089317.