Effects of elevated atmospheric carbon dioxide concentration and drought on soybean leaf photosynthesis
type: CreativeWork
description: Soybean (Glycine max (L.) Merr. cv. Jack) was grown in the field in rain-protected plots to study effects of drought and atmospheric CO$\sb2$ enrichment on leaf gas exchange. Midday depressions in net leaf photosynthetic CO$\sb2$ exchange rates (Pn) were found in drought-stressed plants and the diurnal changes were mostly stomatal regulated, although accumulated drought stress eventually resulted in some non-stomatal limitations. However, seasonal changes in Pn were mostly limited by non-stomatal factors. Water use efficiency was always higher for drought stressed plants and depended on the severity of stress and associated stomatal or nonstomatal limitations. At enriched atmospheric CO$\sb2$ levels, stomatal limitations to Pn under drought stress were less important than at ambient atmospheric CO$\sb2$ levels. Morning and afternoon leaf starch levels were enhanced in both irrigated and nonirrigated plants in enriched CO$\sb2$. Afternoon starch levels were higher in stressed leaves than in non-stressed leaves at normal CO$\sb2$ levels.
abstract: Soybean (Glycine max (L.) Merr. cv. Jack) was grown in the field in rain-protected plots to study effects of drought and atmospheric CO$\sb2$ enrichment on leaf gas exchange. Midday depressions in net leaf photosynthetic CO$\sb2$ exchange rates (Pn) were found in drought-stressed plants and the diurnal changes were mostly stomatal regulated, although accumulated drought stress eventually resulted in some non-stomatal limitations. However, seasonal changes in Pn were mostly limited by non-stomatal factors. Water use efficiency was always higher for drought stressed plants and depended on the severity of stress and associated stomatal or nonstomatal limitations. At enriched atmospheric CO$\sb2$ levels, stomatal limitations to Pn under drought stress were less important than at ambient atmospheric CO$\sb2$ levels. Morning and afternoon leaf starch levels were enhanced in both irrigated and nonirrigated plants in enriched CO$\sb2$. Afternoon starch levels were higher in stressed leaves than in non-stressed leaves at normal CO$\sb2$ levels.
author: Chen, Xiaoming
language: eng
keywords: Agriculture, Agronomy, Biology, Ecology, Biology, Plant Physiology
date published: 2011-05-07T13:45:26Z
date modified: 2026-07-22T22:25:20Z
provider: University of Illinois - Urbana-Champaign
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Illinois at Urbana-Champaign

PropertyValue
property ID: Handle
value: http://hdl.handle.net/2142/22610