Basic mutant information
Mutant name	ossgr
Mutant/Transgenic	mutant
Ecotype	japonica rice Hwacheong- wx
Mutagenesis type	N-methyl-N-nitrosourea (MNU) treatment
(Semi-)Dominant/Recessive	recessive
Description	The sgr mutation is caused by a single-base change (G295A) in the coding region of Sgr, resulting in a missense mutation (V99M). Leaves of the mutant remained green, while turning yellow in those of the wild-type rice during senescence. The stay green phenotype was controlled by a single recessive nuclear gene, tentatively symbolized as sgr(t). All the phenotypic characteristics of the mutant were the same as those of the wild-type lines except for the stay green trait. The leaf chlorophyll concentration of the mutant was similar to that of the wild-type before heading, but decreased steeply in the wild-type during grain filling, while very slowly in the mutant. However, no difference in photosynthetic activity was observed between the stay green mutant and the yellowing wild-type leaves, indicating that senescence is proceeding normally in the mutant leaves and that the mutation affects the rate of chlorophyll degradation during the leaf senescence.
References	1: Cha KW, Lee YJ, Koh HJ, Lee BM, Nam YW, Paek NC Isolation, characterization, and mapping of the stay green mutant in rice. Theor. Appl. Genet. 2002 Mar;104(4):526-532 2: Park SY, Yu JW, Park JS, Li J, Yoo SC, Lee NY, Lee SK, Jeong SW, Seo HS, Koh HJ, Jeon JS, Park YI, Paek NC The senescence-induced staygreen protein regulates chlorophyll degradation. Plant Cell 2007 May;19(5):1649-64
Mutated genes
GenBank ID	AY850134
Alias	OsSGR
Organism	Rice (Oryza sativa)
Description	Senescence inducible chloroplast stay-green protein in rice
Phenotype information
Natural senescence Chlorophyll content high Leaf color green