NDLI: Cholodny–Went revisited: a role for jasmonate in gravitropism of rice coleoptiles

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Planta : Volume 222, Issue 5, November 2005

Planta : Volume 222, Issue 2, October 2005

Planta : Volume 222, Issue 3, October 2005

Planta : Volume 222, Issue 1, September 2005

Cholodny–Went revisited: a role for jasmonate in gravitropism of rice coleoptiles

Content Provider	Springer Nature Link
Author	Gutjahr, Caroline Riemann, Michael Müller, Axel Düchting, Petra Weiler, Elmar W. Nick, Peter
Copyright Year	2005
Abstract	Gravitropism is explained by the Cholodny–Went hypothesis: the basipetal flow of auxin is diverted laterally. The resulting lateral auxin gradient triggers asymmetric growth. However, the Cholodny–Went hypothesis has been questioned repeatedly because the internal auxin gradient is too small to account for the observed growth asymmetry. Therefore, an additional gradient in indolyl-3-acetic acid (IAA) sensitivity has been suggested (Brauner and Hager in Planta 51:115–147, 1958). We challenged the Cholodny–Went hypothesis for gravitropism of rice coleoptiles (Oryza sativa L.) and found it to be essentially true. However, we observed, additionally, that the two halves of gravitropically stimulated coleoptiles responded differentially to the same amount of exogenous auxin: the auxin response is reduced in the upper flank but normal in the lower flank. This indicates that the auxin-gradient is amplified by a gradient of auxin responsiveness. Hormone contents were measured across the coleoptile by a GC-MS/MS technique and a gradient of jasmonate was detected opposing the auxin gradient. Furthermore, the total content of jasmonate increased during the gravitropic response. Jasmonate gradient and increase persist even when the lateral IAA gradient is inhibited by 1-N-naphtylphtalamic acid. Flooding with jasmonate delays the onset of gravitropic bending. Moreover, a jasmonate-deficient rice mutant bends more slowly and later than the wild type. We discuss a role of jasmonate as modulator of auxin responsiveness in gravitropism.
Starting Page	575
Ending Page	585
Page Count	11
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	222
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-07-28
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Auxin-responsiveness Cholodny–Went hypothesis Gravitropism IAA (indolyl-3-acetic acid) JA (jasmonate) Rice (Oryza sativa L.) Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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Cholodny–Went revisited: a role for jasmonate in gravitropism of rice coleoptiles

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Cholodny–Went revisited: a role for jasmonate in gravitropism of rice coleoptiles

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Cholodny–Went revisited: a role for jasmonate in gravitropism of rice coleoptiles