---
scientific_name: Pisum sativum
classical_locus: I
gene_symbols:
  - PsSGR
gene_symbol_long: Staygreen
gene_model_pub_name: AB303332
gene_model_full_id: pissa.Cameor.gnm1.ann1.Psat2g181040
confidence: 5
curators:
  - Marlene Dorneich-Hayes
  - Scott Kalberer
comments:
  - Complementation test confirms that PsSGR is the Mendelian I locus. SGR is a positive regulator of pathways involved in breakdown of
    chlorophyll via translational or post-translational regulation of chlorophyll degrading enzymes. The products of SGR are required
    to separate chlorophyll from the photosynthetic complex, allowing chlorophyll degrading enzymes access to their substrate.
    The sgr loss-of-function mutation is due to lower expression of the SGR gene and a small insertion that disrupts SGR protein fuction.
phenotype_synopsis: The recessive phenotype sgr retains a high chlorophyll content during senescence, causing cotyledons to stay green as
    they mature and leaves to stay green as they die. PsSGR is a cosmetic stay-green mutant and does not retain the ability to photosynthesize.
traits:
  - entity_name: chlorophyll catabolic process
    entity: GO:0015996
  - entity_name: positive regulation of chlorophyll catabolic process
    entity: GO:1903648
  - entity_name: plant embryo cotyledon color
    entity: TO:0000980
  - entity_name: leaf senescence trait
    entity: TO:0000249
references:
  - citation: Sato, Morita et al., 2007
    doi: 10.1073/pnas.0705521104
    pmid: 17709752
  - citation: Armstead, Donnison et al., 2007
    doi: 10.1126/science.1132912
    pmid: 17204643
  - citation: Aubry, Mani et al., 2008
    doi: 10.1007/s11103-008-9314-8
    pmid: 18301989
  - citation: Hortensteiner, 2009
    doi: 10.1016/j.tplants.2009.01.002
    pmid: 19237309