Abstract
Three maize genotypes were grown in controlled environment chambers with ambient (38 Pa) or elevated (70 Pa) carbon dioxide and water stress treatments were initiated 17 days after sowing. Shoot dry weight of the drought tolerant hybrid in both CO2 treatments was 44 to 73% less than that of the intermediate and sensitive hybrids when seedlings were well watered. Decreased shoot and root dry weights of the tolerant maize hybrid due to drought were about one-half that of the other two hybrids. Genotypic differences were observed in decreases of soil water content, leaf water potential, net photosynthesis and stomatal conductance in response to drought. Eleven of 19 amino acids measured in this study increased, methionine was unchanged and alanine and aspartate decreased in response to drought in the ambient CO2 treatment. Increased amino acid levels under elevated CO2 were observed at the end of the experiment. Significant genotypic differences were detected for amino acid responses to drought. Effects of drought on all three genotypes were mitigated by CO2 enrichment. Decreased shoot growth likely improved the stress tolerance of a highly drought resistant maize hybrid by reducing moisture loss, improving soil moisture content and increasing leaf water potential.
Highlights
IntroductionCO2 enrichment on primary metabolism in maize leaves using control and water stressed vegetative plants.[9] In this earlier etative growth of Optimum AQUAmaxTM (Pioneer Hi-Bred International, USA) lines and that of an elite control maize hybrid line study about 85% of the major metabolites in from Pioneer-Hi Bred International with
Introduction effects ofCO2 enrichment on primary metabolism in maize leaves using control and water stressed vegetative plants.[9]
We tance because of its high yield potential, its about one-fourth of the affected metabolites hypothesized that stomatal function, leaf water many industrial uses and its suitability as an responded differently when drought treat- relations, photosynthesis and leaf metabolite animal feedstock.[1]
Summary
CO2 enrichment on primary metabolism in maize leaves using control and water stressed vegetative plants.[9] In this earlier etative growth of Optimum AQUAmaxTM (Pioneer Hi-Bred International, USA) lines and that of an elite control maize hybrid line study about 85% of the major metabolites in from Pioneer-Hi Bred International with. The production of maize is of global impor- maize leaves were impacted by drought and differing moisture stress tolerance. Levels would differ between drought resistant are rain-fed and the crop is subject to periodic The primary effect of elevated CO2 treatments and drought susceptible maize genotypes and water deficits that diminish yields.[2] Soil water was to delay the impact of soil moisture that CO2 enrichment would modify genotypic deficiencies can result from insufficient rain- deficits on maize by decreasing rates of stom- responses to water stress. Soil water was to delay the impact of soil moisture that CO2 enrichment would modify genotypic deficiencies can result from insufficient rain- deficits on maize by decreasing rates of stom- responses to water stress. [page 38]
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