NDLI: Involvement of Arabidopsis thaliana phospholipase Dζ2 in root hydrotropism through the suppression of root gravitropism

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Involvement of Arabidopsis thaliana phospholipase Dζ2 in root hydrotropism through the suppression of root gravitropism

Planta : Volume 231, Issue 1, December 2009

Involvement of Arabidopsis thaliana phospholipase Dζ2 in root hydrotropism through the suppression of root gravitropism

Content Provider	Springer Nature Link
Author	Taniguchi, Yukimi Y. Taniguchi, Masatoshi Tsuge, Tomohiko Oka, Atsuhiro Aoyama, Takashi
Copyright Year	2009
Abstract	Root hydrotropism is the phenomenon of directional root growth toward moisture under water-deficient conditions. Although physiological and genetic studies have revealed the involvement of the root cap in the sensing of moisture gradients, and those of auxin and abscisic acid (ABA) in the signal transduction for asymmetric root elongation, the overall mechanism of root hydrotropism is still unclear. We found that the promoter activity of the Arabidopsis phospholipase Dζ2 gene (PLDζ2) was localized to epidermal cells in the distal root elongation zone and lateral root cap cells adjacent to them, and that exogenous ABA enhanced the activity and extended its area to the entire root cap. Although pldζ2 mutant root caps did not exhibit a morphological phenotype in either the absence or presence of exogenous ABA, the inhibitory effect of ABA on gravitropism, which was significant in wild-type roots, was not observed in pldζ2 mutant roots. In root hydrotropism experiments, pldζ2 mutations significantly retarded or disturbed root hydrotropic responses. A drought condition similar to that used in a hydrotropism experiment enhanced the PLDζ2 promoter activity in the root cap, as did exogenous ABA. These results suggest that PLDζ2 responds to drought through ABA signaling in the root cap and accelerates root hydrotropism through the suppression of root gravitropism.
Starting Page	491
Ending Page	497
Page Count	7
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	231
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-11-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ABA Drought Phospholipase D Root cap Root gravitropism Root hydrotropism Ecology Forestry Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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