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|標題:||Starch biosynthesizing enzymes in developing grains of rice cultivar Tainung 67 and its sodium azide-induced rice mutant||作者:||Jeng, T.L.
|關鍵字:||grain filling rate;grain filling duration;low amylose mutant;Oryza;sativa;rice grains;starch biosynthesizing enzymes;maize zea-mays;carbohydrate-metabolism enzymes;adp-glucose;pyrophosphorylase;debranching enzyme;sugary-1 mutants;sucrose;endosperms;kernels;synthase;protein||Project:||Field Crops Research||期刊/報告no：:||Field Crops Research, Volume 84, Issue 3, Page(s) 261-269.||摘要:||
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. (C) 2003 Elsevier Science B.V. All rights reserved.
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