PGL, encoding chlorophyllide a oxygenase 1, impacts leaf senescence and indirectly affects grain yield and quality in rice. (25th December 2015)

• Record Type: Journal Article
• Authors: Yang, Yaolong; Xu, Jie; Huang, Lichao; Leng, Yujia; Dai, Liping; Rao, Yuchun; Chen, Long; Wang, Yuqiong; Tu, Zhengjun; Hu, Jiang; Ren, Deyong; Zhang, Guangheng; Zhu, Li; Guo, Longbiao; Qian, Qian; Zeng, Dali
• Is Part Of: Journal of experimental botany. Volume 67:Number 5(2016)
• Page Start: 1297
• Page End: 1310
• Publication Date: 2015-12-25
• Subjects: Chlorophyll b -- chlorophyllide a oxygenase -- leaf senescence -- pale green leaf -- rice.; Botany -- Periodicals; Botany, Experimental -- Periodicals; Plant physiology -- Periodicals; 580
• DOI: 10.1093/jxb/erv529
• Languages: English
• ISSNs: 0022-0957

Abstract

Highlight: PGL encodes CAO1 in rice, which is essential for Chl b synthesis and affects Chl synthesis and degradation. PGL also impacts leaf senescence and indirectly affects grain yield and quality. Abstract: 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.