Microtubules are a target for self-incompatibility signaling in Papaver pollen

Plant Physiology
Natalie S PoulterVernonica E Franklin-Tong

Abstract

Perception and integration of signals into responses is of crucial importance to cells. Both the actin and microtubule cytoskeleton are known to play a role in mediating diverse stimulus responses. Self-incompatibility (SI) is an important mechanism to prevent self-fertilization. SI in Papaver rhoeas triggers a Ca(2+)-dependent signaling network to trigger programmed cell death (PCD), providing a neat way to inhibit and destroy incompatible pollen. We previously established that SI stimulates F-actin depolymerization and that altering actin dynamics can push pollen tubes into PCD. Very little is known about the role of microtubules in pollen tubes. Here, we investigated whether the pollen tube microtubule cytoskeleton is a target for the SI signals. We show that SI triggers very rapid apparent depolymerization of cortical microtubules, which, unlike actin, does not reorganize later. Actin depolymerization can trigger microtubule depolymerization but not vice versa. Moreover, although disruption of microtubule dynamics alone does not trigger PCD, alleviation of SI-induced PCD by taxol implicates a role for microtubule depolymerization in mediating PCD. Together, our data provide good evidence that SI signals target the microtubu...Continue Reading

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Citations

Oct 6, 2010·Protoplasma·Giampiero Cai, Mauro Cresti
May 14, 2011·Cell Death and Differentiation·A Smertenko, V E Franklin-Tong
Jun 2, 2009·Nature·Michael J WheelerVernonica E Franklin-Tong
Dec 30, 2008·Journal of Experimental Botany·Giampiero Cai, Mauro Cresti
Jan 26, 2010·Journal of Experimental Botany·Michael J WheelerVernonica E Franklin-Tong
Feb 18, 2010·Journal of Experimental Botany·Christopher J StaigerLaurent Blanchoin
Oct 26, 2013·Amino Acids·Stefano Del DucaGiampiero Cai
Jan 23, 2014·Journal of Experimental Botany·Katie A WilkinsVernonica E Franklin-Tong
Nov 10, 2015·Current Opinion in Plant Biology·Ying Fu
Sep 30, 2014·Journal of Integrative Plant Biology·Giampiero CaiMauro Cresti
Apr 10, 2010·Journal of Integrative Plant Biology·Ying Fu
Mar 22, 2014·Biochemical Society Transactions·Deborah J EavesVernonica E Franklin-Tong
Apr 11, 2013·Molecular Plant·Thomas Dresselhaus, Noni Franklin-Tong
Feb 26, 2015·Frontiers in Plant Science·Elisabetta OnelliAlessandra Moscatelli
Jan 1, 2013·Plants·Giampiero CaiStefano Del Duca
Jul 11, 2008·The Biochemical Journal·Vernonica E Franklin-Tong, Campbell W Gourlay
Jan 11, 2019·International Journal of Molecular Sciences·Stefano Del DucaGiampiero Cai
Mar 20, 2010·Biochemical Society Transactions·Natalie S PoulterVernonica E Franklin-Tong

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