Electrochemical aging responses in pisum: cellular adaptations or recovery from injury?

Abstract:

:Following excision, etiolated epicotyl segments of Pisum sativum L. cv. Alaska exhibit a marked hyperpolarization of membrane potential which is followed by a linear accumulation of K(+) when segments are incubated in Higinbotham nutrient solution. Segments aged for several hours and then reexcised display only a slight depolarization of membrane potential and no delay in ion accumulation; thus, recovery from injury appears an unlikely explanation for these responses. Substances originating in either the plumule or the cotyledons do not seem to be directly involved in these "aging" responses. However, locally produced substances, such as ethylene, or substances originating in the roots have not been eliminated as causative factors. Cold temperatures and cycloheximide prolong the lag in K(+) accumulation indicating a metabolic explanation for the induced K(+) accumulation. However, similar specific activities of plasma membrane-bound ATPase were found in isolates from fresh and aged epicotyl segments. Reactivation of an ion transport mechanism, perhaps responsible for the osmotic control of growth in immature cells, is suggested as a possible explanation for the pattern of ion accumulation characteristic of excised pea epicotyl tissue.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Pierce WS

doi

10.1104/pp.67.4.864

subject

Has Abstract

pub_date

1981-04-01 00:00:00

pages

864-8

issue

4

eissn

0032-0889

issn

1532-2548

journal_volume

67

pub_type

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