Portal de Periódicos da CAPES

PGL , encoding chlorophyllide a oxygenase 1, impacts leaf senescence and indirectly affects grain yield and quality in rice

2015; Oxford University Press; Volume: 67; Issue: 5 Linguagem: Inglês

10.1093/jxb/erv529

1460-2431

Yaolong Yang, Jie Xu, Lichao Huang, Yujia Leng, Liping Dai, Yuchun Rao, Long Chen, Yuqiong Wang, Zhengjun Tu, Jiang Hu, Deyong Ren, Guangheng Zhang, Li Zhu, Longbiao Guo, Qian Qian, Dali Zeng,

Plant Gene Expression Analysis

Chlorophyll (Chl) b is a ubiquitous accessory pigment in land plants, green algae, and prochlorophytes. This pigment is synthesized from Chl a by chlorophyllide a oxygenase and plays a key role in adaptation to various environments. This study characterizes a rice mutant, pale green leaf (pgl), and isolates the gene PGL by using a map-based cloning approach. PGL, encoding chlorophyllide a oxygenase 1, is mainly expressed in the chlorenchyma and activated in the light-dependent Chl synthesis process. Compared with wild-type plants, pgl exhibits a lower Chl content with a reduced and disorderly thylakoid ultrastructure, which decreases the photosynthesis rate and results in reduced grain yield and quality. In addition, pgl exhibits premature senescence in both natural and dark-induced conditions and more severe Chl degradation and reactive oxygen species accumulation than does the wild-type. Moreover, pgl is sensitive to heat stress.