Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 67, Issue 5, Pages 1297-1310Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv529
Keywords
Chlorophyll b; chlorophyllide a oxygenase; leaf senescence; pale green leaf; rice
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Funding
- National Natural Science Foundation of China [91435105416, 31171531]
- State Key Basic Research Program [2013CBA01403]
- Ministry of Agriculture of China for transgenic research [2014ZX08009003-001]
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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.
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