Stem pithiness in tomato plants: The effect of water stress and the role of abscisic acid
作者:
Beny Aloni,
Etan Pressman,
期刊:
Physiologia Plantarum
(WILEY Available online 1981)
卷期:
Volume 51,
issue 1
页码: 39-44
ISSN:0031-9317
年代: 1981
DOI:10.1111/j.1399-3054.1981.tb00876.x
出版商: Blackwell Publishing Ltd
关键词: Tomato stem pithiness;Pith parenchyma;Abscisic acid;Kinetin
数据来源: WILEY
摘要:
The pith parenchyma in tomato (Lycopersicum esculentum) stems was found to be disrupted in response to water stress (stem pithiness). The process of the degradation starts at the upper part of the stem and proceeds downwards as the stress is prolonged. The damage to the stem tissue was found to be irreversible upon rehydration of the stressed plants. Scanning electron microscopy revealed that the protoplast of the affected cells is disrupted first, followed by degradation of the cell wall.Application of abscisic acid (ABA) induced pithiness in non‐stressed plants and also enhanced the effect of a short period of dehydration. Kinetin, although causing severe wilting, did not induce pithiness. However, when given after a short period of water stress or within the period of stress, kinetin enhanced pithiness development.In the course of the stress, ABA levels in the upper part of the stem and in the young leaves were higher than the levels found in the lower parts of the plant shoot. The increase in ABA levels was detected before any sign of pithiness.It is suggested that ABA might be the triggering agent of the cellular degradation process initiated by water stres
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