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Starch granule size distribution in wheat grain in relation to phosphorus fertilization

Published online by Cambridge University Press:  03 June 2011

Y. NI
Affiliation:
National Key Laboratory of Crop Biology, Agronomy College of Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
Z. WANG*
Affiliation:
National Key Laboratory of Crop Biology, Agronomy College of Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
Y. YIN
Affiliation:
National Key Laboratory of Crop Biology, Agronomy College of Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
W. LI
Affiliation:
College of Plant Science, Anhui Science and Technology University, Fengyang 233100, Anhui, P. R. China
S. YAN
Affiliation:
College of Plant Science, Anhui Science and Technology University, Fengyang 233100, Anhui, P. R. China
T. CAI
Affiliation:
National Key Laboratory of Crop Biology, Agronomy College of Shandong Agricultural University, Tai'an 271018, Shandong, P.R. China
*
*To whom all correspondence should be addressed. Email: [email protected]

Summary

Starch granule size distribution of wheat is an important characteristic that can affect its chemical composition and functionality. Phosphorus (P) fertilization has been studied extensively; however, little is known about its impact on starch granule size distribution in wheat. In the present study, two high-yield winter wheat cultivars were grown under different P fertilization conditions to evaluate its effect on starch granule size distribution and starch components in wheat grains at maturity. P fertilization resulted in a significant increase in the proportions (both by volume and by surface area) of B-type (<9·9 μm equivalent diameter (e.d.)) starch granules, with a reduction in those of A-type (>9·9 μm e.d.) starch granules. The P fertilization also increased starch content, amylose content and amylopectin content at maturity. However, P fertilization conditions significantly reduced the ratio of amylose to amylopectin, which showed a significant positive relationship with the volume proportion of granules 22·8–42·8 μm e.d. but was negatively related to the volume proportion of granules 2·8–9·9 μm e.d.

Type
Crops and Soils
Copyright
Copyright © Cambridge University Press 2011

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