Journal of Experimental Botany, Vol 49, 1119-1127, Copyright © 1998 by Oxford University Press
D Miralles, D Calderini, K Pomar and A D'Ambrogio
A field experiment was conducted under non-limiting water and nutritional
conditions with three near-isogenic 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 flag-leaf
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 Rht 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.Keywords:
Cell dimensions, plant height, Rht alleles,
Triticum aestivum/wheat.
ARTICLES
Dwarfing genes and cell dimensions in different organs of wheat
Catedra de Cerealicultura, Departamento de Produccion Vegetal, Facultad de Agronomia, Universidad de Buenos Aires, Av. San Martin 4453, 1417 Buenos Aires, Argentina; Catedra de Botanica Agricola, Departamento de Ecologia, Facultad de Agronomia, Universidad de Buenos Aires, Av. San Martin 4453, 1417 Buenos Aires, Argentina; Present and corresponding address; e-mail: D.Miralles@pi.csiro.au
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  Z. Yang, E. J. van Oosterom, D. R. Jordan, and G. L. Hammer Pre-anthesis ovary development determines genotypic differences in potential kernel weight in sorghum J. Exp. Bot., March 1, 2009; 60(4): 1399 - 1408. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. Alvaro, C. Royo, L. F. Garcia del Moral, and D. Villegas Grain Filling and Dry Matter Translocation Responses to Source-Sink Modifications in a Historical Series of Durum Wheat Crop Sci., July 1, 2008; 48(4): 1523 - 1531. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. Alvaro, J. Isidro, D. Villegas, L. F. Garcia del Moral, and C. Royo Breeding Effects on Grain Filling, Biomass Partitioning, and Remobilization in Mediterranean Durum Wheat Agron. J., February 26, 2008; 100(2): 361 - 370. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
R. A. Richards, G. J. Rebetzke, A. G. Condon, and A. F. van Herwaarden Breeding Opportunities for Increasing the Efficiency of Water Use and Crop Yield in Temperate Cereals Crop Sci., January 1, 2002; 42(1): 111 - 121. [Abstract] [Full Text] [PDF]
|
|