Responses to CO2 Enrichment by Two Genotypes of Arabidopsis thaliana Differing in their Sensitivity to Nutrient Availability
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文摘
The responses of two genotypes of Arabidopsis thaliana, which differ in their sensitivities to nutrients to present and predicted future CO2 concentration were determined under rich vs. poor nutrient regimes on the basis of both single traits and the whole plant. Based on individual traits, the two genotypes responded similarly to CO2 enrichment for all the traits measured except for rate of increase in crown diameter, for which a decrease was observed in the less nutrient-sensitive genotype grown at increased CO2. Based on the overall response of the whole plant, by analysing groups of plant traits using multivariate analysis, the two genotypes differed substantially from one another and both responded more strongly to nutrient availability than to CO2 concentration, especially for traits measured at harvest that related to reproductive fitness. The less nutrient-sensitive genotype also showed a weaker overall response to CO2, and the pattern of the overall response was strikingly similar at different nutrient supply. In contrast, the more nutrient-sensitive genotype responded more strongly to CO2 than the less nutrient-sensitive genotype, and responded differently to CO2 at low vs. high nutrient availability.