Effects of sulphur dioxide (SO2) on growth and flowering of SO2-tolerant and non-tolerant genotypes of Phleum pratense
Identifieur interne : 004175 ( Main/Exploration ); précédent : 004174; suivant : 004176Effects of sulphur dioxide (SO2) on growth and flowering of SO2-tolerant and non-tolerant genotypes of Phleum pratense
Auteurs : M. Jill Clapperton ; David M. ReidSource :
- Environmental Pollution [ 0269-7491 ] ; 1994.
Abstract
The objective of this study was to compare the growth and interaction of clipping and sulphur dioxide (SO2) exposure on SO2-tolerant and non-tolerant genotypes of Phleum pratense at two field sites along an SO2-concentration gradient. Sulphur-dioxide-tolerant and non-tolerant genotypes of Phleum pratense were identified from indigenous populations that had been collected along the same SO2-concentration gradient in southern Alberta, Canada. Physiological differences between the two genotypes were confirmed by supplying leaves with 14CO2 and examining the assimilate partitioning between the genotypes. For the field experiment, clones of each genotype and seedlings grown from commercial seed were planted at two different field sites along an SO2-emission gradient. There were no differences in growth between the genotypes at the two field sites after the first year except that the SO2-tolerant clones had a greater percentage of root length colonised by vesicular-arbuscular (VA) mycorrhizal fungi. After the second growing season, there was a significant decrease in the number of inflorescences produced by plants exposed to SO2, particularly by the non-tolerant genotype. The added stress of defoliation appeared to increase the sensitivity of flowering to SO2, again particularly in the non-tolerant genotype. The results of the field study showed that flowering as opposed to vegetative plant growth was more sensitive to long-term low-concentration SO2 exposure and that this sensitivity was compounded by the stress interaction of defoliation.
Url:
DOI: 10.1016/0269-7491(94)90165-1
Affiliations:
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