Effects of plant growth stage and leaf aging on the response of transpiration and photosynthesis to water deficit in sunflower
Fety Nambinina Andrianasolo A B E , Pierre Casadebaig B E , Nicolas Langlade C D , Philippe Debaeke B E and Pierre Maury B E F
+ Author Affiliations
- Author Affiliations
A Terres Inovia, Centre INRA de Toulouse, CS 52627, F-31326 Castanet-Tolosan Cedex, France.
B INRA, UMR AGIR, CS 52627, F-31326 Castanet-Tolosan Cedex, France.
C INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France.
D CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France.
E Université de Toulouse, INP, ENSAT, CS 52627, F-31326 Castanet-Tolosan Cedex, France.
F Corresponding author. Email: maury@ensat.fr
Functional Plant Biology 43(8) 797-805 https://doi.org/10.1071/FP15235
Submitted: 8 August 2015 Accepted: 18 April 2016 Published: 2 June 2016
Abstract
Water deficit influences leaf transpiration rate and photosynthetic activity. The genotype-dependent response of the latter has not been assessed in sunflower (Helianthus annuus L.), particularly during the reproductive period when grain filling and lipogenesis depend greatly on photosynthate availability. To evaluate genotypic responses to water deficit before and after flowering, two greenhouse experiments were performed. Four genotypes − two inbred lines (PSC8, XRQ) and two cultivars (Inedi, Melody) − were subjected to progressive water deficit. Non-linear regression was used to calculate the soil water deficit threshold (FTSWt) at which processes (transpiration and photosynthetic activity) were affected by water deficit. In the vegetative growth stage, photosynthetic activity was affected at a lower mean value of FTSWt (0.39) than transpiration (0.55). However, in the reproductive stage, photosynthetic activity was more sensitive to soil water deficit (FTSWt = 0.45). We found a significant (P = 0.02) effect of plant growth stage on the difference between photosynthesis and transpiration rate thresholds and, a significant (P = 0.03) effect of leaf age on transpiration. Such results will improve phenotyping methods and provide paths for integrating genotypic variability into crop models.
Additional keywords: genotype, Helianthus annuus L., net CO2 assimilation rate, senescence, transpiration, water stress.
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