Effects of grain position on the panicle on starch biosynthetic enzyme activity in developing grains of rice cultivar Tainung 67 and its NaN3-induced mutant

T. L. JENG; C. S. WANG; C. L. CHEN; J. M. SUNG

doi:10.1017/S0021859603003599

Effects of grain position on the panicle on starch biosynthetic enzyme activity in developing grains of rice cultivar Tainung 67 and its NaN3-induced mutant

Journal

The Journal of Agricultural Science

Journal Volume

141

Journal Issue

3-4

Pages

303-311

Date Issued

2003-12

Date

2003-12

Author(s)

T. L. JENG

C. S. WANG

C. L. CHEN

J. M. SUNG

DOI

10.1017/S0021859603003599

URI

https://scholars.tari.gov.tw/handle/123456789/14341

https://www.cambridge.org/core/journals/journal-of-agricultural-science/article/abs/effects-of-grain-position-on-the-panicle-on-starch-biosynthetic-enzyme-activity-in-developing-grains-of-rice-cultivar-tainung-67-and-its-nan3induced-mutant/81FE33DDE15BD2FCDC8E843A64E268D4

Abstract

The content of starch and the activities of enzymes involved in starch biosynthesis were examined in developing grains of field grown rice (Oryza sativa L.) plants. Enzyme activities were monitored throughout the grain filling period of cultivar Tainung 67 and its NaN3-induced mutant SA419. The activities of most of the grain enzymes involved in starch biosynthesis increased and reached their maxima during the initial period of grain development, then gradually declined towards the later stages of grain filling. Both Tainung 67 and SA419 showed different starch and amylose accumulation patterns in different grain positions. In cultivar Tainung 67, reduced activities of grain enzymes involved in starch biosynthesis, particularly during the early phase of grain filling, were related to the decreased starch accumulation for the grains located on proximal secondary branches as compared with the grains located on distal primary branches. The decreased amylose contents in the grains of Tainung 67 located on proximal secondary branches were attributable to their lower granule bound starch synthase and starch debranching enzyme activities at early and mid phases of grain filling. In mutant SA419, no significant changes were observed in the activities of grain enzymes involved in sucrose to starch conversion between the grains located on distal primary and proximal secondary branches of the panicle. As a result, grain setting position was found to have little effect on the contents of starch and amylose for these developing grains located on different branches. Thus, the mutant SA419 did have some agronomic and physiological traits that were superior to its wild type cultivar Tainung 67.

Publisher

Cambridge University Press

Type

journal article

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