Regulation of lettuce hypocotyl elongation by gibberellic acid. Correlation between cell elongation, stress-relaxation properties of the cell wall and wall polysaccharide content :

• Kawamura,Hideto

  Department of Biology, Faculty of Science, Osaka City University:(Present)Department of Anatomy, Aichi Medical University

• Kamisaka,Seiichiro

  Department of Biology, Faculty of Science, Osaka City University

• Masuda,Yoshio

  Department of Biology, Faculty of Science, Osaka City University

抄録

Lettuce hypocotyl elongation caused by gibberellic acid was strongly inhibited by coumarin and dichlobenil, known inhibitors of cellulose biosynthesis. Stress-relaxation analysis of the cell wall revealed that gibberellic acid induces a decrease in both minimum relaxation time (To) and relaxation rate (b) and an increase in maximum relaxation time (Tm), when gibberellic acid stimulates hypocotyl elongation. Both coumarin and dichlobenil nullified the effect of gibberellic acid on changes in To, Tm and b values. The content of pectic, hemicellulosic and cellulosic substances in the cell wall increased per hypocotyl but decreased per unit hypocotyl length, in response to gibberellic acid treatment. Particularly, gibberellic acid caused a substantial increase in cellulose content per hypocotyl but a decrease per unit length. A good correlation existed between the decrease in to and the decrease in hemicellulose content per unit length of the cell wall. The increase in Tm was correlated with the decrease in cellulose content per unit length of the cell wall. The decrease in b was correlated with the decrease in the content of both cellulose and hemicellulose per unit length. Based on these results, we discuss the role of polysaccharide metabolism of the cell wall in gibberellic acid-induced lettuce hypocotyl elongation and the nature of gibberellic acid-induced biochemical modifications of the cell wall, which are represented by changes in stress-relaxation properties of the cell wall.

収録刊行物

• Plant and cell physiology

  Plant and cell physiology 17 (1), 23-34,

  Japanese Society of Plant Physiologists

詳細情報

• CRID: 1542824520173792512
• NII論文ID: 110003717062
• NII書誌ID: AA0077511X
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10766975
• 本文言語コード: en
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