Water movement into dormant and non-dormant wheat (Triticum aestivum L.) grains

Rathjen, J. R., Strounina, E. V. and Mares, D. J. (2009) Water movement into dormant and non-dormant wheat (Triticum aestivum L.) grains. Journal of Experimental Botany, 60 6: 1619-1631. doi:10.1093/jxb/erp037


Author Rathjen, J. R.
Strounina, E. V.
Mares, D. J.
Title Water movement into dormant and non-dormant wheat (Triticum aestivum L.) grains
Journal name Journal of Experimental Botany   Check publisher's open access policy
ISSN 0022-0957
Publication date 2009-04-01
Sub-type Article (original research)
DOI 10.1093/jxb/erp037
Open Access Status DOI
Volume 60
Issue 6
Start page 1619
End page 1631
Total pages 13
Editor David Prosser
Place of publication United Kingdom
Publisher Oxford University Press
Language eng
Subject C1
Abstract The movement of water into harvest-ripe grains of dormant and non-dormant genotypes of wheat (Triticum aestivum L.) was investigated using Magnetic Resonance Micro-Imaging (MRMI). Images of virtual sections, both longitudinal and transverse, throughout the grain were collected at intervals after the start of imbibition and used to reconstruct a picture of water location within the different grain tissues and changes over time. The observations were supplemented by the weighing measurements of water content and imbibition of grains in water containing I2/KI which stains starch and lipid, thereby acting as a marker for water. In closely related genotypes, with either a dormant or a non-dormant phenotype, neither the rate of increase in water content nor the pattern of water distribution within the grain was significantly different until 18 h, when germination became apparent in the non-dormant genotype. Water entered the embryo and scutellum during the very early stages of imbibition through the micropyle and by 2 h water was clearly evident in the micropyle channel. After 12 h of imbibition, embryo structures such as the coleoptile and radicle were clearly distinguished. Although water accumulated between the inner (seed coat) and outer (pericarp) layers of the coat surrounding the grain, there was no evidence for movement of water directly across the coat and into the underlying starchy endosperm.
Keyword Dormancy
magnetic resonance
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
Centre for Advanced Imaging Publications
 
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Created: Thu, 03 Sep 2009, 18:13:20 EST by Mr Andrew Martlew on behalf of Centre For Magnetic Resonance