The effect of shade upon seedling growth in groundsel bush (Baccharis halimifolia L.)

Panetta F.D. (1977) The effect of shade upon seedling growth in groundsel bush (Baccharis halimifolia L.). Australian Journal of Agricultural Research, 28 4: 681-690. doi:10.1071/AR9770681


Author Panetta F.D.
Title The effect of shade upon seedling growth in groundsel bush (Baccharis halimifolia L.)
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1977-01-01
Sub-type Article (original research)
DOI 10.1071/AR9770681
Open Access Status
Volume 28
Issue 4
Start page 681
End page 690
Total pages 10
Subject 1100 Agricultural and Biological Sciences
Abstract Analysis of seedling growth of groundsel bush (Baccharis halimifolia L.) under different glasshouse light conditions indicated that seedlings growing in light shade (24% daylight) maintained relative growth rates equal to those of seedlings grown unshaded (57% daylight) for up to 11 weeks after germination. Compensation for reduced light was effected through increased leaf area rather than through increased photosynthetic efficiency. Although markedly less than in unshaded or light shade treatments, growth was maintained throughout the experimental period under the lowest radiant flux employed (17% daylight). Root systems developed more slowly and were smaller in shaded than in unshaded seedlings. Increased stem allocation (height growth) followed a peak in root allocation, and did not occur until 11 weeks after germination in any treatment. Comparisons of seed weight and seedling relative growth rate with associated pasture species indicate that groundsel is at a disadvantage in terms of both parameters. It appears that the success of this woody weed is due largely to a combination of high reproductive output and effective dispersal, which enables it to colonize relatively open microsites which occur in cultivated as well as natural field situations.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 14 Jun 2016, 15:17:12 EST by System User