Sugar metabolism in expanding husk leaves of flint corn (Zea mays L.) genotypes differing in husk leaf size

Journal of Agricultural Science Volume 139 Issue 1 Page 37-45 published_at 2002-08
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Title ( eng )
Sugar metabolism in expanding husk leaves of flint corn (Zea mays L.) genotypes differing in husk leaf size
Creator
Fujikawa Y.
Sendo S.
Oka T.
Yamana H.
Ofosu-Bude K.G.
El-Shemy H.
Fujita K.
Source Title
Journal of Agricultural Science
Volume 139
Issue 1
Start Page 37
End Page 45
Abstract
Relationships between leaf expansion and MeOH-soluble (cytosol) and cell-wall fractions, and their sugar composition prior to silking in flint corn lines were studied. A greater husk leaf area of one genotype, X-15 is mainly due to prolonged and higher rate of expansion. Prior to rapid expansion of husk leaf area, neutral sugars in the cytosol fraction accounted for most of the non-starch carbohydrates (56-62%), while hemicellulose and cellulose fractions accounted for less than 20%.0 In mature leaf parts, however, sugars in the cytosol fraction decreased but those in hemicellulose and cellulose fractions increased by 30 0x1.e499cp-891nd 42%, respectively. The predominant sugar in the cytosol fraction was glucose (Glc), while in the hemicellulose fraction xylose (Xyl) and arabinose (Ara) dominated. During rapid expansion of husk leaves, 13C was incorporated at a higher rate into hemicellulose than cellulose, and this process was more active in X-15 than in other genotypes. During an identical period, 13C atom 0.000000e+00xcess in Xyl increased markedly in the hemicellulose fraction, however it remained low in the cytosol one. The current results suggest that synthesis of Xyl and xylan plays an important role in renewal of hemicellulose, which may be required for expansion.
Keywords
metabolism
sugar
NDC
Biology [ 460 ]
Language
eng
Resource Type journal article
Publisher
Cambridge University Press
Date of Issued 2002-08
Rights
Copyright (c) 2002 Cambridge University Press
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0021-8596
[DOI] 10.1017/S0021859602002319
[DOI] http://dx.doi.org/10.1017/S0021859602002319 isVersionOf