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A mutation of OSOTP 51 leads to impairment of photosystem I complex assembly and serious photo-damage in rice.

Abstract：

:Gene expression in chloroplasts is regulated by many nuclear-encoded proteins. In this study, we isolated a rice (Oryza sativa subsp. japonica) mutant osotp51 with significant reduction in photosystem I (PSI). The osotp51 is extremely sensitive to light and accumulates a higher level of reactive oxygen species. Its leaves are almost albino when grown at 40 μmol photons/m(2) per s. However, grown at 4 μmol photons/m(2) per s, osotp51 has a similar phenotype to the wild-type. 77K chlorophyll fluorescence analysis showed a blue shift in the highest peak emission from PSI in osotp51. In addition, the level of PSI and PSII dimer is dramatically reduced in osotp51. OSOTP 51 encodes a pentatricopeptide repeats protein, homologous to organelle transcript processing 51 in Arabidopsis. Loss-of-function OSOTP51 affects intron splicing of a number of plastid genes, particularly the ycf3 coding a protein involved in the assembly of PSI complex. OSOTP51 is functionally conserved in higher plants. The mutation of osotp51 indirectly leads to a widespread change in the structure and functions of PSI, results in severe photoinhibition, and finally dies, even when grown under very low light intensity.

journal_name

J Integr Plant Biol

journal_title

Journal of integrative plant biology

authors

Ye JW,Gong ZY,Chen CG,Mi HL,Chen GY

doi

10.1111/j.1744-7909.2012.01094.x

subject

Has Abstract

pub_date

2012-02-01 00:00:00

pages

87-98

issue

2

eissn

1672-9072

issn

1744-7909

journal_volume

54

pub_type

杂志文章

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