Hydrotropism interacts with gravitropism by degrading amyloplasts in seedling roots of Arabidopsis and radish.

Abstract:

:In response to a moisture gradient, roots exhibit hydrotropism to control the orientation of their growth. To exhibit hydrotropism, however, they must overcome the gravitropism that is dominant on Earth. We found that moisture gradient or water stress caused immediate degradation of the starch anchors, amyloplasts, in root columella cells of Arabidopsis and radish (Raphanus sativus). Namely, development of hydrotropic response was accompanied by a simultaneous reduction in starch content in columella cells. Rapid degradation of amyloplasts in columella cells also occurred in the water-stressed roots with sorbitol or mannitol. Both hydrotropically stimulated and water-stressed roots showed a reduced responsiveness to gravity. Roots of a starchless mutant, pgm1-1, showed an enhanced hydrotropism compared with that of the wild type. These results suggest that the reduced responsiveness to gravity is, at least in part, attributable to the degradation of amyloplasts in columella cells. Thus, the reduction in gravitropism allows the roots to exhibit hydrotropism.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Takahashi N,Yamazaki Y,Kobayashi A,Higashitani A,Takahashi H

doi

10.1104/pp.102.018853

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

805-10

issue

2

eissn

0032-0889

issn

1532-2548

pii

132/2/805

journal_volume

132

pub_type

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