Decreased CO 2 availability and inactivation of Rubisco limit photosynthesis in cotton plants under heat and drought stress in the field

A. Elizabete Carmo-Silva, Michael A. Gore, Pedro Andrade Sanchez, Andrew N. French, Doug J. Hunsaker, Michael E. Salvucci

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Heat and drought stresses are often coincident and constitute major factors limiting global crop yields. A better understanding of plant responses to the combination of these stresses under production environments will facilitate efforts to improve yield and water use efficiencies in a climatically changing world. To evaluate photosynthetic performance under dry-hot conditions, four cotton (Gossypium barbadense L.) cultivars, Monseratt Sea Island (MS), Pima 32 (P32), Pima S-6 (S6) and Pima S-7 (S7), were studied under well-watered (WW) and water-limited (WL) conditions at a field site in central Arizona. Differences in canopy temperature and leaf relative water content under WL conditions indicated that, of the four cultivars, MS was the most drought-sensitive and S6 the most drought-tolerant. Net CO 2 assimilation rates (A) and stomatal conductances (gs) decreased and leaf temperatures increased in WL compared to WW plants of all cultivars, but MS exhibited the greatest changes. The response of A to the intercellular CO 2 concentration (A-C i) showed that, along with stomatal closure, non-stomatal factors associated with heat stress also limited A under WL conditions, especially in MS. The activation state of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) decreased in WL compared to WW plants, consistent with thermal inhibition of Rubisco activase activity. The extent of Rubisco deactivation could account for the metabolic limitation to photosynthesis in MS. Taken together, these data reveal the complex relationship between water availability and heat stress for field-grown cotton plants in a semi-arid environment. Both diffusive (drought-stress-induced) and biochemical (heat-stress-induced) limitations contributed to decreased photosynthetic performance under dry-hot conditions.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalEnvironmental and Experimental Botany
Volume83
DOIs
StatePublished - Nov 2012

Fingerprint

drought stress
ribulose 1,5-diphosphate
oxygenases
heat stress
cotton
inactivation
photosynthesis
water stress
cultivar
well
water
cultivars
drought
Gossypium barbadense
dry environmental conditions
arid environment
stomatal conductance
water use efficiency
water availability
crop yield

Keywords

  • Carbon assimilation
  • Gossypium barbadense
  • Leaf temperature
  • Rubisco activation
  • Stress tolerance
  • Water deficit

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science
  • Agronomy and Crop Science

Cite this

Decreased CO 2 availability and inactivation of Rubisco limit photosynthesis in cotton plants under heat and drought stress in the field. / Carmo-Silva, A. Elizabete; Gore, Michael A.; Andrade Sanchez, Pedro; French, Andrew N.; Hunsaker, Doug J.; Salvucci, Michael E.

In: Environmental and Experimental Botany, Vol. 83, 11.2012, p. 1-11.

Research output: Contribution to journalArticle

Carmo-Silva, A. Elizabete ; Gore, Michael A. ; Andrade Sanchez, Pedro ; French, Andrew N. ; Hunsaker, Doug J. ; Salvucci, Michael E. / Decreased CO 2 availability and inactivation of Rubisco limit photosynthesis in cotton plants under heat and drought stress in the field. In: Environmental and Experimental Botany. 2012 ; Vol. 83. pp. 1-11.
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