Document Detail

Variation in vein density and mesophyll cell architecture in a rice deletion mutant population.
MedLine Citation:
PMID:  22685308     Owner:  NLM     Status:  MEDLINE    
There is a need to develop rice plants with improved photosynthetic capacity and efficiency in order to enhance potential grain yield. Alterations in internal leaf morphology may be needed to underpin some of these improvements. One target is the production of a 'Kranz-like' anatomy, commonly considered to be required to achieve the desired levels of photosynthesis seen in C(4) crops. Kranz anatomy typically has two or three mesophyll cells interspersing adjacent veins. As a first step to determining the potential for such anatomical modifications in rice leaves, a population of rice deletion mutants was analysed for alterations in vein patterning and mesophyll cells in the interveinal regions. Significant variation is demonstrated in vein arrangement and the sequential distribution of major and minor veins across the leaf width, although there is a significant correlation between the total number of veins present and the width of the leaf. Thus the potential is demonstrated for modifying rice leaf structure. Six distinct rice mutant lines, termed altered leaf morphology (alm) mutants, were analysed for the architecture of their interveinal mesophyll cell arrangement. It is shown that in these mutant lines, the distance between adjacent minor veins and adjacent minor and major veins is essentially determined by the size of the interveinal mesophyll cells rather than changes in mesophyll cell number across this region, and hence interveinal distance changes as a result of cell expansion rather than cell division. This observation will be important when developing screens for traits relevant for the introduction of Kranz anatomy into rice.
I R A Smillie; K A Pyke; E H Murchie
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-06-08
Journal Detail:
Title:  Journal of experimental botany     Volume:  63     ISSN:  1460-2431     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-08-20     Completed Date:  2013-04-17     Revised Date:  2013-07-12    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  4563-70     Citation Subset:  IM    
Plant and Crop Sciences Division, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK.
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MeSH Terms
Body Patterning
Mesophyll Cells / ultrastructure*
Oryza sativa / anatomy & histology*,  genetics*,  growth & development
Plant Leaves / anatomy & histology*,  genetics,  growth & development
Plant Vascular Bundle / anatomy & histology,  genetics,  growth & development
Sequence Deletion
Grant Support
//Biotechnology and Biological Sciences Research Council

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