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

Published online by Cambridge University Press:  15 October 2002

Y. FUJIKAWA ,
N. SAKURAI ,
S. SENDO ,
T. OKA ,
H. YAMANA ,
K. G. OFOSU-BUDU ,
H. EL-SHEMY  and
K. FUJITA
Y. FUJIKAWA
Affiliation:
Faculty of Applied Biological Science, Hiroshima University, 1-4-4, Kagamiyama, Higashihiroshima, 739-8528 Japan
N. SAKURAI
Affiliation:
Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1, Kagamiyama, Higashihiroshima, 739-8521 Japan
S. SENDO
Affiliation:
Hokkaido Tokachi Agricultural Experiment Station, Memuro-cho, Hokkaido, 082-0071 Japan
T. OKA
Affiliation:
Faculty of Applied Biological Science, Hiroshima University, 1-4-4, Kagamiyama, Higashihiroshima, 739-8528 Japan
H. YAMANA
Affiliation:
Faculty of Applied Biological Science, Hiroshima University, 1-4-4, Kagamiyama, Higashihiroshima, 739-8528 Japan
K. G. OFOSU-BUDU
Affiliation:
Agricultural Research Station-Kade, Faculty of Agriculture University of Ghana, Legon, Accra, Ghana
H. EL-SHEMY
Affiliation:
Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1, Kagamiyama, Higashihiroshima, 739-8521 Japan
K. FUJITA
Affiliation:
Faculty of Applied Biological Science, Hiroshima University, 1-4-4, Kagamiyama, Higashihiroshima, 739-8528 Japan
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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%. In mature leaf parts, however, sugars in the cytosol fraction decreased but those in hemicellulose and cellulose fractions increased by 30% and 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 % excess 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.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 139 , Issue 1 , August 2002 , pp. 37 - 45
Copyright
© 2002 Cambridge University Press

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