אסיף מאגר המחקר החקלאי

Thigmomorphogenesis: membrane lipid and protein changes in bean plants as affected by mechanical perturbation and Ethrel

Year:

1983

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Volume :

58

Co-Authors:

Erner, Y., Inst. of Horticulture, Volcani Center, Bet-Dagan, 50250, Israel
Jaffe, M.J., Biology Dept, Wake Forest Univ, Winston-Salem, North Carolina, 27109, United States

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Abstract:

When bean plants (Phaseolus vulgaris L. cv. Red Cherokee Bush) are mechanically perturbed by rubbing, their stem elongation is inhibited and the stem thickness increases. The decrease in cell elongation and the increase in lateral cell divisions, which are partially responsible for this syndrome, were correlated with a decrease in the tree fatty acids and in the phospholipids of the membranes of microsomal fractions of first and second internodes of mechanically stimulated plants. This was true even though only the first internode was mechanically stimulated. Of the microsomal free fatty acids, mechanical perturbation induced an increase in myristic acid and large decreases in stearic, oleic, linoleic and linolenic acids. It also reduced the unsaturated:saturated ratio of the fatty acids. It induced a decrease in phosphatidyl choline but an increase in phosphatidyl ethanolamine. When the fatty acids were cleaved from the microsomal phospholipids, mechanical perturbation caused only a slight decrease in the unsaturated:saturated ratio and no significant changes in the double bond index. Mechanical perturbation induced an increase in the total microsomal protein and of membrane‐associated latent IDPase. However, the activity of membrane‐associated KCN‐insensitive NADPH cytochrome‐c reductase was decreased by mechanical perturbation. Treatment of the first internode with exogenous Ethrel produced results that were very similar in all respects to those obtained by mechanical perturbation. The factors inducing hardening against frost and drought, as achieved by mechanical perturbation and Ethrel treatment, are not only related to sterols or the polar head‐groups of phospholipids but may also be related to the protein components, and all may have an effect on the fluidity of a bilayer membrane model. These data support the hypothesis that ethylene mediates thigmomorphogenesis and that mechanical perturbation of the first internode results in the acropetal transport of a translocatable thigmomorphogenetic factor. Copyright © 1983, Wiley Blackwell. All rights reserved

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