Starch biosynthesizing enzymes in developing grains of rice cultivar Tainung 67 and its sodium azide-induced rice mutant
Journal
Field Crops Research
Journal Volume
84
Journal Issue
3
Pages
261-269
Date Issued
2003-12
Date
2003-12
Author(s)
T.L Jeng
T.H Tseng
C.S Wang
C.L Chen
J.M Sung
Abstract
The relationships between the rate of starch accumulation and the activities of enzymes involving starch biosynthesis in developing grains of field grown rice (Oryza sativa) cultivar Tainung 67 and its sodium azide-induced mutant SA419 were investigated and compared throughout the grain filling period. The results indicated that the activities of most of the grain enzymes involving sugar–starch conversion rose and reached their maximum between 7 and 14 days after anthesis (DAA), but declined rapidly after 21 DAA. The changes in the rate of starch accumulation correlated well with the changes in the activities of sucrose synthase (SUS), invertase, hexokinase, AGPglucose pyrophosphorylase, UDPglucose pyrophosphorylase, phosphoglucoisomerase, phosphoglucomutase, soluble starch synthase (SSS), granule bound starch synthase (GBSS), starch-branching enzyme (SBE) and starch debranching enzyme (SDBE), during the grain filling period. The rapid grain-fill and shorter period of grain filling in mutant SA419, as compared with Tainung 67, were associated with its higher activity of starch synthesizing at the early phase of grain growth. The lower amylose content of SA419 grains (8%) in comparison with Tainung 67 grains (20%) was possibly due to their inferiority to synthesize amylose through GBSS and SDBE.
Subjects
grain filling rate
grain filling duration
low amylose mutant
Oryza sativa
rice grains
starch biosynthesizing enzymes
Publisher
Elsevier
Type
journal article
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