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TOUCH ME – ‘Touch’ genes in the micropylar endosperm

Published online by Cambridge University Press:  19 September 2013

Hiroyuki Nonogaki
Hiroyuki Nonogaki*
Affiliation:
Department of Horticulture, Oregon State University, Corvallis, OR97331, USA
*
*Correspondence E-mail: hiro.nonogaki@oregonstate.edu
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Abstract

The micropylar region of endosperm (ME) is a physical barrier to radicle emergence in seeds of many different species, including tomato (Solanum lycopersicum) and Arabidopsis thaliana. ME is thought to be weakened through cell wall-modifying proteins, and this is supported by transcriptome data showing enrichment of cell wall-associated genes in ME. Gibberellin and ethylene have been suggested to be involved in induction of these genes in ME. However, mechanisms underlying this critical event for germination still remain elusive. In addition to hormonal regulation of ME weakening, recent data from high-throughput analyses suggested that it might be important for the radicle tip to ‘touch’ ME (or mechanosensing), in terms of ME-specific gene induction. This emerging hypothesis can be integrated with previous hypotheses about hormonal regulation of ME-specific gene expression in seeds.

Keywords

Arabidopsismicropylar endosperm (ME)tissue-specific gene expressiontomatotouch
Type
Research Opinion
Information
Seed Science Research , Volume 23 , Issue 4 , December 2013 , pp. 217 - 221
Copyright
Copyright © Cambridge University Press 2013 

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