NDLI: Silencing of the tobacco pollen pectin methylesterase NtPPME1 results in retarded in vivo pollen tube growth

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Planta : Volume 223, Issue 3, February 2006

Planta : Volume 223, Issue 2, January 2006

Planta : Volume 223, Issue 1, December 2005

Silencing of the tobacco pollen pectin methylesterase NtPPME1 results in retarded in vivo pollen tube growth

Content Provider	Springer Nature Link
Author	Bosch, Maurice Hepler, Peter K.
Copyright Year	2005
Abstract	Sperm delivery in flowering plants requires extensive pollen tube growth through the female sporophytic tissues of the pistil. The apical cell wall emerges as a central player in the control of pollen tube growth, since it provides strength to withstand the internal turgor pressure, while imparting sufficient plasticity to allow cell wall extension through the incorporation of new membrane and wall material. Within this scenario, pectin methylesterases (PMEs; EC 3.1.1.11) emerge as crucial regulators in determining the mechanical properties of pectins, the major component of the apical pollen tube wall. We previously identified NtPPME1, a pollen specific PME from Nicotiana tabacum. Here we show that silencing of NtPPME1 results in a mild but significant decrease of in vivo pollen tube growth while the overall PME activity in pollen is not significantly affected. Although the precise mechanisms responsible for the observed phenotype are not known, it seems likely that the cell must maintain a closely regulated level of PME activity in order to maintain the equilibrium between strength and plasticity in the apical cell wall. A relatively minor disturbance of this equilibrium, as caused by NtPPME1 silencing, compromises pollen tube growth.
Starting Page	736
Ending Page	745
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	223
Issue Number	4
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-06
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cell wall Gene-silencing Nicotiana Pectin methylesterase Pollen tube Reproduction
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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