Stress relaxation properties of the cell wall of growing intact plants

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The cell wall of dark-grown Avena coleoptiles and the epidermis of light-grown mungbean hypocotyls was subjected to stress-relaxation analysis and the following results were obtained. 1. Actively growing apical regions of the organs, either coleoptiles or hypocotyls, had certain threshold values of minimum stress-relaxation time, T_o, 0.04 sec for coleoptile cell wall and 0.03 sec for the epidermal cell wall of. hypocotyls. The cell wall of the basal region of the organs, which were mature and not growing, had a higher value of To. 2. When the apical regions of the organs, either coleoptiles or hypocotyls, ceased to grow. their cell walls showed T_o values above these thresholds. 3. The relaxation rate, b, was small in the cell wall of actively growing regions of the organs, compared with that of non-growing regions. 4. The maximum relaxation time, T_m, was variable and no significant relation-ship with growth capacity was found. 5. The extensibility, mm/gr, was large not only in actively growing regions of the organs but also in fully grown regions, suggesting that the value represents complex properties of the cell wall including the history of cell wall extension. From these results, we concluded that biochemical modifications occur in the cell wall matrix of actively growing organs of either monocots or dicots, and these are the bases of the capacity of the cell wall to extend and are represented chiefly by T_o and possibly by b.
日本植物生理学会の論文

Stress relaxation properties of the cell wall of growing intact plants

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