Full TGIF Record # 229358
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DOI:10.1111/j.1744-7348.1984.tb03038.x
Web URL(s):http://onlinelibrary.wiley.com/doi/10.1111/j.1744-7348.1984.tb03038.x/pdf
    Last checked: 09/12/2013
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Publication Type:
i
Refereed
Author(s):Colvill, Kay E.; Marshall, C.
Author Affiliation:School of Plant Biology, University College of North Wales, Bangor, Gwynedd
Title:Tiller dynamics and assimilate partitioning in Lolium perenne with particular reference to flowering
Source:Annals of Applied Biology. Vol. 104, No. 3, June 1984, p. 543-557.
Publishing Information:London, England, United Kingdom: Cambridge University Press
# of Pages:15
Related Web URL:http://onlinelibrary.wiley.com/doi/10.1111/j.1744-7348.1984.tb03038.x/abstract
    Last checked: 09/12/2013
    Notes: Abstract only
Keywords:TIC Keywords: Behavior; Carbon-14; Flowering; Growth analysis; Growth factors; Lolium perenne; Tillering rate; Tillers (vegetative)
Abstract/Contents:"The fate of 100 seedling plants of Lolium perenne L. was studied over a period of 2 years in a field plot. The birth and death of tillers and the production of inflorescences was followed, and the components of seed yield were recorded in detail in the first year. The pattern of distribution of 14CO2 assimilated by the main shoot was examined at monthly intervals and during the first flowering season the distribution of 14C-assimilate from individual leaves and from the inflorescence was also studied. The capacity of individual tillers to assimilate 14CO2 prior to flowering and the re-distribution of previously accumulated assimilate during seed growth were also assessed. Plants died at a more or less constant rate with time and only 54 survived to the end of the 2-yr period. First year mortality was associated with severe grazing or cutting but in the second year the death of ungrazed plants was observed. There was great variability in the production of tillers by surviving plants. In both years the number of live tillers per plant increased from July to the end of April with particularly rapid tillering in March and April establishing the maximum value for each year. There was a similar phase of rapid tillering after flowering in July. The number of live tillers per plant declined by 50% during stem elongation and inflorescence emergence and the majority of dead tillers were young secondary (in the first year) and tertiary (in the second year) tillers with a mean age of 40 days. Such tillers had poor assimilatory capacity prior to the onset of death and were not supplied with assimilate from the main shoot. Most of the plants surviving at the end of the experiment flowered in both years and one quarter of the maximum number of live tillers per plant recorded in April of each year produced inflorescences. The earlier a tiller was produced the greater was its chance of flowering and the greater its production of seed. The greater weight of seed produced was associated with the development of more seed-bearing florets per spikelet. There was relatively little export of "C-assimilate from the flowering main shoot, and the lower internodes formed the major sink for post-anthesis assimilate. The growth of seeds appeared to be relatively independent of the leaves for current assimilate. There was some evidence that assimilate accumulated in lower internodes was remobilised and utilised in the growth of seeds and new tillers. Overall, the results confirm the view that the grass plant is a dynamic population of short-lived tillers and indicate that increasing competition for assimilate at flowering exerts a major influence on the production and survival of tillers."
Language:English
References:31
Note:Summary appears as abstract
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Colvill, K. E., and C. Marshall. 1984. Tiller dynamics and assimilate partitioning in Lolium perenne with particular reference to flowering. Ann. Appl. Biol. 104(3):p. 543-557.
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DOI: 10.1111/j.1744-7348.1984.tb03038.x
Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1111/j.1744-7348.1984.tb03038.x/pdf
    Last checked: 09/12/2013
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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