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Light is required for initiating chloroplast biogenesis and photosynthesis; however, the photosystem II reaction center (PSII RC) can be photodamaged. In this study, we characterized  pvsl1 , a seedling-lethal mutant of  Phaseolus vulgaris . This mutant showed lethality when exposed to sunlight irradiation and a yellow-green leaf phenotype when grown in a growth chamber under low-light conditions. We developed 124 insertion/deletion (INDEL) markers based on resequencing data of Dalong1 and PI60234, two local Chinese common bean cultivars, for genetic mapping. We identified  Phvul.002G190900 , which encodes the PvFtsH2 protein, as the candidate gene for this  pvsl1  mutation through fine-mapping and functional analysis. A single-base deletion occurred in the coding region of  Phvul.002G190900  in the  pvsl1  mutant, resulting in a frameshift mutation and a truncated protein lacking the Zn 2+  metalloprotease domain. Suppressed expression of  Phvul.002G190900  at the transcriptional level was detected, while no change in the subcellular localization signal was observed. The seedlings of  pvsl1  exhibited hypersensitivity to photoinhibition stress. In the  pvsl1  mutant, abnormal accumulation of the D1 protein indicated a failure to rapidly degrade damaged D1 protein in the PSII RC. The results of this study demonstrated that PvFtsH2 is critically required for survival and maintaining photosynthetic activity by degrading photodamaged PSII RC D1 protein in common bean.

A critical role of PvFtsH2 in the degradation of photodamaged D1 protein in common bean