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Mechanical induction of lateral root...

Richter, Gregory L.

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Mechanical induction of lateral root initiation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Mechanical induction of lateral root initiation./
Author:	Richter, Gregory L.
Description:	129 p.
Notes:	Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5363.
Contained By:	Dissertation Abstracts International70-09B.
Subject:	Biology, Botany. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3374538
ISBN:	9781109376876

Mechanical induction of lateral root initiation.
Richter, Gregory L.

Mechanical induction of lateral root initiation. - 129 p.

Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5363.

Thesis (Ph.D.)--The Pennsylvania State University, 2009.

Unlike mammals whose development is limited to a short temporal window, plants produce organs de novo throughout their lifetime in order to adapt their architecture to the prevailing environmental conditions. Development of the root system represents a morphogenetic program where the positioning of new lateral organs occurs through the periodic recruitment of pericycle cells to become founder cells of a new lateral root (LR) primordium. While the hormone auxin appears intimately involved in specifying LR formation, it remains unclear why some pericycle cells are specified to initiate a LR while others are not. In the following thesis, I show that mechanical forces can act as one of the triggers for founder cell formation and so entrain the pattern of LR production to the environment. I observed that transient physical bending of the root was capable of eliciting LR formation to the convex side of the curve. Such mechanical stimulation triggered a Ca2+ transient within the pericycle, which was associated with the recruitment of ordinary pericycle cells to a LR founder cell fate. The initial establishment of the mechanically induced LR primordium was independent of an auxin supply from the shoot and was not disrupted by mutants in a suite of auxin transporters and receptor/response elements.

ISBN: 9781109376876Subjects--Topical Terms:

1017825
Biology, Botany.

Mechanical induction of lateral root initiation.
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100 1 $a Richter, Gregory L. $3 1676744
245 1 0 $a Mechanical induction of lateral root initiation.
300 $a 129 p.
500 $a Source: Dissertation Abstracts International, Volume: 70-09, Section: B, page: 5363.
500 $a Adviser: Richard Cyr.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2009.
520 $a Unlike mammals whose development is limited to a short temporal window, plants produce organs de novo throughout their lifetime in order to adapt their architecture to the prevailing environmental conditions. Development of the root system represents a morphogenetic program where the positioning of new lateral organs occurs through the periodic recruitment of pericycle cells to become founder cells of a new lateral root (LR) primordium. While the hormone auxin appears intimately involved in specifying LR formation, it remains unclear why some pericycle cells are specified to initiate a LR while others are not. In the following thesis, I show that mechanical forces can act as one of the triggers for founder cell formation and so entrain the pattern of LR production to the environment. I observed that transient physical bending of the root was capable of eliciting LR formation to the convex side of the curve. Such mechanical stimulation triggered a Ca2+ transient within the pericycle, which was associated with the recruitment of ordinary pericycle cells to a LR founder cell fate. The initial establishment of the mechanically induced LR primordium was independent of an auxin supply from the shoot and was not disrupted by mutants in a suite of auxin transporters and receptor/response elements.
520 $a Mechanical forces have long been proposed to act as plant morphogenetic factors, however the cellular elements that translate mechanical force to a developmental signaling cascade have remained obscure. My observations indicate that in the case of mechanical induction of LR formation, the program of organogenesis may be triggered by mechanically elicited Ca2+ changes that can even suppress the requirement for many auxin-related elements normally involved in founder cell recruitment. Thus, the mechano-sensitive Ca2+ signaling system responsible for eliciting LR founder cell fate provides a potentially widespread mechanism whereby external and endogenous mechanical forces could be translated into morphogenetic programs during plant growth and development.
590 $a School code: 0176.
650 4 $a Biology, Botany. $3 1017825
650 4 $a Biology, Plant Physiology. $3 1017865
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710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 70-09B.
790 1 0 $a Cyr, Richard, $e advisor
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791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3374538