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PITHINESS IN PLANTS. II. THE NATURE OF PITHINESS IN BEAN STEMS AND ITS CONTROL BY ENVIRONMENTAL PERTURBATION AND ETHYLENE

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Pithiness occurs in the stems of unperturbed bean plants according to a genetic programming and it is not caused by environmental stresses. It starts at the base of the hypocotyl and progresses with growth acropetally, internode by internode, but it is not correlated with elongation in any simple way. The nodes of the stem do not become pithy. After it has become completely pithy, an internode begins to fill in slowly, starting from the base. Mechanical perturbation and drought stress cause moderate increases in ethylene evolution, and both pretreatments induce resistance to pithiness, as does exogenously applied ethephon. It is concluded that pithiness occurs in beans during natural growth, that it can be inhibited by environmental perturbations, and that this control is mediated by ethylene.

Affiliations: 1: Biology Department, Wake Forest University

10.1080/0021213X.1988.10677090
/content/journals/10.1080/0021213x.1988.10677090
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/content/journals/10.1080/0021213x.1988.10677090
1988-04-12
2018-06-24

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