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Carbon dioxide enrichment effects on soybean glycine max physiology 1. effects of long term carbon dioxide exposure



Carbon dioxide enrichment effects on soybean glycine max physiology 1. effects of long term carbon dioxide exposure



Crop Science 24(6): 1146-1150



Soybeans [G. max (L.) Merr. 'Kent' and 'Ware'], grown under field conditions, were exposed to a CO2-enriched atmosphere (1232 .mu.l l-1) from 22 days after planting to maturity. Seed yield increased 81% in Kent and 56% in Ware in response to CO2 enrichment. Plants grownb at high CO2 concentrations maintained higher rates of apparent photosynthesis and lower leaf conductances throughout ontogeny than those grown at low CO2 concentrations. CO2-enriched plants accumulated larger pools of soluble sugars and starch in the leaves compared with control plants. Rapid depletion of the stored carbohydrates was evident at the time flower buds were developing and flowering commenced. CO2 enriched plants also maintained large pools of starch and sucrose in the leaves during the grain-filling periods, suggesting that these were not utilized for seed development. Control plants were virtually devoid of sucrose and starch at plant maturity. Examination of leaf chlorophyll, protein and proteolytic enzyme activity revealed that CO2 enrichment did not delay senescence in soybeans.

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