Claim · model-written summary
The decrease in isoamylase activity was not related to the magnitude of the sugary phenotype in rice mutants.
- Taxon
- rice
Oryza sativae1 - Material
- sugary-1 mutantse1
- Outcome
- decrease in isoamylase activitye2
- Qualifier
- not related to the magnitude of the sugary phenotypee2
Not reportedDirection
Verbatim
e1“The activities of the two types of starch debranching enzymes, isoamylase and pullulanase, were greatly reduced in endosperms of allelic sugary-1 mutants of rice (Oryza sativa)”
e2“the decrease in isoamylase activity was not related to the magnitude of the sugary phenotype”
Title
Akiko Kubo; Naoko Fujita; Kyuya Harada; et al. PLANT PHYSIOLOGY 1999. doi:10.1104/pp.121.2.399
Other claims from this paper (6)
- Association Starch debranching enzyme activities were greatly reduced in the endosperms of allelic sugary-1 rice mutants.
- Association In line EM-5, pullulanase activity was markedly lower in the phytoglycogen region than in the starch region.
- Association In rice sugary-1 mutant endosperm, isoamylase activity was extremely low or completely lost.
- Observation Isoamylase was present in significant and trace amounts in mutants EM-273 and EM-5, respectively, but was apparently inactive.
- Mechanism Both debranching enzymes are involved in amylopectin biosynthesis in rice endosperm.
- Observation The Sugary-1 gene encodes the isoamylase gene of the rice genome.