The Divergent Roles of STAYGREEN (SGR) Homologs in Chlorophyll Degradation |
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| Authors: | Yasuhito Sakuraba So-Yon Park Nam-Chon Paek |
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| Affiliation: | 1.Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-921, Korea;2.Department of Plant Pathology, Physiology and Weed Science, Virginia Tech, Blacksburg, VA 24061-0331, USA;3.Crop Biotechnology Institute, GreenBio Science and Technology, Seoul National University, Pyeongchang 232-916, Korea |
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| Abstract: | Degradation of chlorophyll (Chl) by Chl catabolic enzymes (CCEs) causes the loss of green color that typically occurs during senescence of leaves. In addition to CCEs, STAYGREEN1 (SGR1) functions as a key regulator of Chl degradation. Although sgr1 mutants in many plant species exhibit a stay-green phenotype, the biochemical function of the SGR1 protein remains elusive. Many recent studies have examined the physiological and molecular roles of SGR1 and its homologs (SGR2 and SGR-LIKE) in Chl metabolism, finding that these proteins have different roles in different species. In this review, we summarize the recent studies on SGR and discuss the most likely functions of SGR homologs. |
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| Keywords: | abiotic stress chlorophyll catabolic enzymes chlorophyll degradation STAYGREEN (SGR) SGR-LIKE (SGRL) |
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