Effect of carbon dioxide enrichment on development of the first six mainstem leaves in soybean. [Glycine max (L. ) Merr. cv. Bragg]

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · American Journal of Botany; (USA)

DOI:https://doi.org/10.2307/2444443· OSTI ID:7024473

Leadley, P W; Reynolds, J F ^[1]

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1. North Carolina State Univ., Raleigh (USA)

Many conclusions concerning plant responses to CO{sub 2} enrichment have been based on assumptions of increased leaf size derived from observations of average leaf area measured at some time well into the growth period. The objective of this study were to study the effect of elevated CO{sub 2} on (1) the timing of mainstem leaflet appearance, (2) the rate and duration of leaflet expansion, and (3) the final area of individual leaflets of soybeans (Gylcine max (L.) Merr. cv. Bragg) grown from seed at 348, 502, and 645 {mu}1 1{sup {minus}1} CO{sub 2} concentrations. Central leaflet areas from mainstem trifoliolates 1-6 were measured every two days time of appearance to full expansion. Leaflets tended to appear earlier in elevated CO{sub 2} treatments; leaflets 2 through 6 appeared an average of 0.4 days earlier in the 502 {mu}1 1{sup {minus}1} treatment and 1.2 days earlier in the 645 {mu}1 1{sup {minus}1} treatment than in the 349 {mu}1 1{sup {minus}1} treatment. Relative rates of expansion were different among leaflets in their response to elevated CO{sub 2}; expansion rates of leaflets 1 and 4 were significantly higher at the highest CO{sub 2} concentration. However, final area of leaflets was not affected by CO{sub 2}, or (in leaflet 5 only) was slightly smaller at the highest CO{sub 2} treatment. Apparently, higher expansion rates of leaflets 1 and 4 at high CO{sub 2} were offset by a tendency for decreased duration of expansion. It appears that there are morphological constraints on final leaflet area in soybean seedlings which limit the effects of elevated CO{sub 2} on the early development of mainstem leaf area.

• OSTI ID: 7024473
• Journal Information: American Journal of Botany; (USA), Journal Name: American Journal of Botany; (USA) Vol. 76:10; ISSN 0002-9122; ISSN AJBOA
• Country of Publication: United States
• Language: English

Related Subjects

551000 -- Physiological Systems
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BIOLOGICAL EFFECTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
GLYCINE HISPIDA
GROWTH
LEAVES
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MORPHOLOGY
OXIDES
OXYGEN COMPOUNDS
PLANT GROWTH
PLANTS
SEEDLINGS