Low red/far-red ratios delay spike and stem growth in wheat

The responses to low red light/far-red light (R/FR) ratios simulating dense stands were evaluated in wheat (Triticum aestivum L) cultivars released at different times in the 20th century and consequently resulting from an increasingly prolonged breeding and selection history. While tillering respons...

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Bibliographic Details
Published in:Journal of experimental botany 2010-06, Vol.61 (11), p.3151-3162
Main Authors: Ugarte, Cristina Cecilia, Trupkin, Santiago Ariel, Ghiglione, Hernán, Slafer, Gustavo, Casal, Jorge José
Format: Article
Language:English
Subjects:
Biological and medical sciences
Crop harvesting
Florets
Fundamental and applied biological sciences. Psychology
Gene Expression Regulation, Developmental - radiation effects
Gene Expression Regulation, Plant - radiation effects
Grain yield
Grains
Leaf sheaths
Light
Peduncle
phytochrome
Plant Proteins - genetics
Plant Proteins - metabolism
Plant Stems - genetics
Plant Stems - growth & development
Plant Stems - metabolism
Plant Stems - radiation effects
Plants
red/far-red ratio
RESEARCH PAPER
Research Papers
shade avoidance
spike
Spikelets
Tillering
Tillers
Triticum - genetics
Triticum - growth & development
Triticum - metabolism
Triticum - radiation effects
Wheat
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Summary:The responses to low red light/far-red light (R/FR) ratios simulating dense stands were evaluated in wheat (Triticum aestivum L) cultivars released at different times in the 20th century and consequently resulting from an increasingly prolonged breeding and selection history. While tillering responses to the R/FR ratio were unaffected by the cultivars, low R/FR ratios reduced grain yield per plant (primarily grain number and secondarily grain weight per plant) particularly in modern cultivars. Low R/FR ratios delayed spike growth and development, reduced the expression of spike marker genes, accelerated the development of florets already initiated, and reduced the number of fertile florets at anthesis. It is noteworthy that low R/FR ratios did not promote stem or leaf sheath growth and therefore the observed reduction of yield cannot be accounted for as a consequence of divergence of resources towards increased plant stature. It is proposed that the regulation of yield components by the R/FR ratio could help plants to adjust to the limited availability of resources under crop conditions.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/erq140