Gene Details:

• MSU gene ID: LOC_Os08g09230
• RAPdb gene ID: Os08g0191433
• Gene Symbol: OsSSIIIa Flo5
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• Hence, the OsSSIIIa (Oryza sativa SSIIIa) mutations are referred to as white-core floury endosperm 5-1 (flo5-1) and flo5-2.
• Based upon their X-ray diffraction patterns, the crystallinity of the starch in the Flo5 mutant endosperm is decreased compared with wild type.
• Through determination of the chain-length distribution of the mutant endosperm starch, we found that Flo5-1 and Flo5-2 mutants have reduced the content of long chains with degree of polymerization (DP) 30 or greater compared with the controls.
• This suggests that OsSSIIIa/Flo5 plays an important role in generating relatively long chains in rice endosperm.
• In addition, DP 6 to 8 and DP 16 to 20 appeared to be reduced in endosperm starch of Flo5-1 and Flo5-2, whereas DP 9 to 15 and DP 22 to 29 were increased in these mutants.
• We propose a distinct role for OsSSIIIa/Flo5 and the coordinated action of other SS isoforms during starch synthesis in the seed endosperm of rice.
• Knockout of a starch synthase gene OsSSIIIa/Flo5 causes white-core floury endosperm in rice (Oryza sativa L.).

Function-related keywords:

• endosperm ,  starch ,  seed

Literature:

• Knockout of a starch synthase gene OsSSIIIa/Flo5 causes white-core floury endosperm in rice (Oryza sativa L.) .  DOI:  10.1007/s00299-007-0309-8 ;  PMID:  17297616
• Double repression of soluble starch synthase genes SSIIa and SSIIIa in rice (Oryza sativa L.) uncovers interactive effects on the physicochemical properties of starch .  DOI:  10.1139/g11-010 ;  PMID:  21595523
• Deciphering starch quality of rice kernels using metabolite profiling and pedigree network analysis .  DOI:  10.1093/mp/ssr101 ;  PMID:  22180466
• Characterization of SSIIIa-deficient mutants of rice: the function of SSIIIa and pleiotropic effects by SSIIIa deficiency in the rice endosperm .  DOI:  10.1104/pp.107.102533 ;  PMID:  17586688
• Critical roles of soluble starch synthase SSIIIa and granule-bound starch synthase Waxy in synthesizing resistant starch in rice .  DOI:  10.1073/pnas.1615104113 ;  PMID:  27791174
• Loss of function of SSIIIa and SSIIIb coordinately confers high RS content in cooked rice .  DOI:  10.1073/pnas.2220622120 ;  PMID:  37126676

Related News:

Gene Resources:

• NCBI ID: AAM49811
• UniProt accessions:

Sequences: