+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Acclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolism

Acclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolism

Journal of Experimental Botany 50(330): 127-138

Influence of long-term water deficit on photosynthesis, electron transport and carbon metabolism of sunflower leaves has been examined. Water deficit was imposed from flower bud formation up to the stage of full flowering in the field on two sunflower hybrids with different drought tolerance. CO2 assimilation and stomatal conductance of the intact leaves, determined at atmospheric CO2 and full sunlight (1500-2000 micromole quanta m-2 s-1), decreased with water deficit. Maximum quantum efficiency of PSII (Fv/Fm) and relative quantum yield of PSII determined under similar experimental conditions, did not change significantly in severely stressed leaves. The strong inhibition of the plateau region of the light response curve, determined at high CO2 (5%) in water-deficient sunflower leaves, indicates that photosynthesis is also limited by non-stomatal factors. The decreased slope and the plateau of the CO2 response curves show that the capacity of carboxylation and RuBP regeneration decreased in severely stressed intact leaves. Rubisco specific activity decreased in severely stressed leaves, but Rubisco content increased under prolonged drought. The increase of Rubisco content was significantly higher in leaves of the drought-tolerant sunflower hybrid indicating that a higher Rubisco content could be one factor in conferring better acclimation and higher drought tolerance.

(PDF emailed within 0-6 h: $19.90)

Accession: 003030273

Download citation: RISBibTeXText

DOI: 10.1093/jxb/50.330.128

Related references

Limitation of photosynthesis by carbon metabolism i. evidence for excess electron transport capacity in leaves carrying out photosynthesis in saturating light and carbon dioxide. Plant Physiology (Rockville) 81(4): 1115-1122, 1986

On the relationship between electron transport rate and photosynthesis in leaves of the C-4 plant Sorghum bicolor exposed to water stress, temperature changes and carbon metabolism inhibition. Australian Journal of Plant Physiology 22(6): 885-892, 1995

Limitation of Photosynthesis by Carbon Metabolism : I. Evidence for Excess Electron Transport Capacity in Leaves Carrying Out Photosynthesis in Saturating Light and CO(2). Plant Physiology 81(4): 1115-1122, 1986

Acclimation of potato plants to polyethylene glycol-induced water deficit I. Photosynthesis and metabolism. Journal of Experimental Botany 49(325): 1349-1360, 1998

Acclimation of potato plants of polyethylene glycol-induced water deficit. I. Photosynthesis and metabolism. Journal of experimental botany 49(325): 1349-1360, 1998

Acclimation of soybean plants to water deficit ii. recovery of photosynthesis and leaf water status under prolonged water deficit. Japanese Journal of Crop Science 55(3): 374-378, 1986

Photosynthesis and photo respiratory carbon di oxide evolution of water stressed sunflower leaves. Planta (Heidelberg) 126(3): 247-258, 1975

Photosynthesis, photorespiration, and carbon assimilation in water-stressed sunflower and maize leaves at two oxygen concentrations. Berichte 2(1): 145-152, 1979

The effects of water deficit on carbon assimilation and partitioning of recent assimilates in field-grown sunflower leaves. Biologia Plantarum (Prague) 36(SUPPL ): S294, 1994

Responses of photosynthesis and carbohydrate accumulation in sunflower leaves to short-term water stress. Helia 18(22): 25-35, 1995

The ecological significance of long-distance water transport: short-term regulation, long-term acclimation and the hydraulic costs of stature across plant life forms. Plant, Cell and Environment 26(1): 163-182, 2003

Photosynthesis photo respiration and carbon assimilation in water stressed sunflower and maize leaves at 2 oxygen concentrations. Berichte der Deutschen Botanischen Gesellschaft 92(1): 145-152, 1979

Acclimation of Biochemical and Diffusive Components of Photosynthesis in Rice, Wheat, and Maize to Heat and Water Deficit: Implications for Modeling Photosynthesis. Frontiers in Plant Science 7(): 1719-1719, 2016

Effect of water deficit on photosynthesis and electron transport in wheat grown in a natural environment. Journal of Plant Physiology 142(2): 156-160, 1993