Alterations in soybean leaf development and photosynthesis in a CO sub 2 -enriched atmosphere

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Botanical Gazette (Chicago); (USA)

DOI:https://doi.org/10.1086/337779· OSTI ID:6787640

Cure, J D ^[1]; Rufty, Jr, T W; Israel, D W ^[2]

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1. Duke Univ., Durham, NC (USA)
2. North Carolina State Univ., Raleigh (USA)

This study was conducted to characterize changes in the canopy photosynthetic leaf area of developing soybean (Glycine max (L.) Merr. cv Lee) exposed to a CO{sub 2}-enriched atmosphere. Young, vegetative plants were exposed to 350 or 700 {mu}L L{sup {minus}1} CO{sub 2} for 15 d. Plant dry mass and total leaf area were greater in the CO{sub 2}-enriched environment. Emergence and expansion rates of main stem leaves increased at high CO{sub 2}, but the areas of individual leaves at full expansion were affected very little (5%-10% greater than controls). More rapid leaf expansion rates occurred in the light and dark. Under CO{sub 2}-enriched conditions, the net CO{sub 2} exchange rates of all leaves on the main stem were higher before and after full expansion. Stomatal conductance was lower in high CO{sub 2} only after leaves approached full expansion. Leaf development on the lateral branches also was increased at high CO{sub 2}, accounting for 40% of the total increase in leaf area by the end of the experiment. The authors conclude that more rapid rates of leaf development under CO{sub 2} enrichment likely resulted from increased photosynthesis rates and that both direct and indirect effects were involved.

• OSTI ID: 6787640
• Journal Information: Botanical Gazette (Chicago); (USA), Vol. 150:4; ISSN 0006-8071
• Country of Publication: United States
• Language: English

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