The role of the apex in the phototropic curvature of Avena coleoptiles: positive curvature under conditions of continuous illumination.

Abstract:

:The differential growth causing second positive phototropic curvature in intact, black-capped and decapitated Avena coleoptiles has been measured. In all cases the curvature is brought about by a cessation in growth of the illuminated side. The fact that shading the apex does not significantly alter the initial steps of differential growth means that the subapical zones can perceive and respond to unilateral illumination. Decapitation significantly reduces coleoptile growth, especially in the most apical zone. However, the fact that differential growth is still evident in the other zones of decapitated coleoptiles within 30 min of unilateral illumination requires one to conclude that the apex cannot be controlling the differential growth in those basal zones.

journal_name

Planta

journal_title

Planta

authors

Franssen JM,Firn RD,Digby J

doi

10.1007/BF00429452

subject

Has Abstract

pub_date

1982-08-01 00:00:00

pages

281-6

issue

4

eissn

0032-0935

issn

1432-2048

journal_volume

155

pub_type

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