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 Physioljournal_title
Plant physiologyauthors
Takahashi N,Yamazaki Y,Kobayashi A,Higashitani A,Takahashi Hdoi
10.1104/pp.102.018853subject
Has Abstractpub_date
2003-06-01 00:00:00pages
805-10issue
2eissn
0032-0889issn
1532-2548pii
132/2/805journal_volume
132pub_type
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