Dwarfing genes and cell dimensions in different organs of wheat

Dwarfing genes and cell dimensions in different organs of wheat

A field experiment was conducted under non-limiting water and nutritional conditions with three nearisogenic lines of spring wheat (dwarf, DD; semi-dwarf, SD and standard height, SH) to study the impact of the GA-insensitive alleles Rht1 and Rht2, at the cellular level, on the growth of different ve...

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Bibliographic Details
Published in:Journal of experimental botany Vol. 49; no. 324; pp. 1119 - 1127
Main Authors: Miralles, D.J., Calderini, D.F., Pomar, K.P., D'Ambrogio, A.
Format: Journal Article
Language:English
Published: Oxford Oxford University Press 01-07-1998
OXFORD UNIVERSITY PRESS
Subjects:
Alleles
Biological and medical sciences
Cell and Molecular Biology, Biochemistry and Molecular Physiology
Cell dimensions
Cell lines
Dwarfing
Epidermal cells
Fundamental and applied biological sciences. Psychology
Grains
Internodes
Leaves
Pericarp
Plant growth. Development of the storage organs
plant height
Plant physiology and development
Plants
Rht alleles
Triticum aestivum
Vegetative apparatus, growth and morphogenesis. Senescence
Wheat
Monocotyledones
Growth
Gibberellin
Genetic determinism
Cereal crop
Field experiment
Dwarfism
Sensitivity
Gramineae
Angiospermae
Plant growth substance
Spermatophyta
Organ specificity
Isogenic line
Morphometry
Cell
Triticum aestivum
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Summary:A field experiment was conducted under non-limiting water and nutritional conditions with three nearisogenic lines of spring wheat (dwarf, DD; semi-dwarf, SD and standard height, SH) to study the impact of the GA-insensitive alleles Rht1 and Rht2, at the cellular level, on the growth of different vegetative organs and of the pericarp of grains. Cell length and width of blades of different leaves (3, 7 and flag leaf), the flagleaf sheath and the penultimate internode as well as the pericarp of basal grains from central spikelets of the spike were evaluated. With the exception of the flag leaf, dwarfing genes produced a significant reduction in cell length in all the different vegetative organs analysed. There was no effect on the number of cells nor their width. Therefore, in vegetative organs, the effects of these alleles appeared to be exclusively due to a reduction in cell length. It would appear that dwarfing genes act on cell elongation without affecting cell division. The Rht alleles did not modify cell length nor width in the pericarp. Grain weight was different between the lines and these differences were associated with grain volume at the beginning of linear grain growth. Thus, they reduced the size of individual grains by reducing the total number of cells in the pericarp. It appears that Rht1 alleles reduced the final sizes of vegetative organs (such as internodes and leaves) and of tissues (pericarp) associated with reproductive structures (grains), but the modes of action in these different organs were different.
Bibliography:istex:6FF2BD29B8D19BC551C8F40ED6CE2BD81CF4CEC6
ark:/67375/HXZ-R9S8PD27-B
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/49.324.1119