Limitations to photosynthesis under light and heat stress in three high-yielding wheat genotypes

https://doi.org/10.1078/0176-1617-00772Get rights and content

Summary

Three high-yielding wheat genotypes (T. aestivum L., c.v. Siete Cerros, Seri and Bacanora, released in 1966, 1982 and 1988, respectively) were grown under irrigation in two high radiation, low relative humidity environments (Tlaltizapan and Ciudad Obregon CIMMYT experimental stations, Mexico). Gas exchange and fluorescence parameters were assessed on the flag leaf during the day. Carbon isotope discrimination (Δ) was analysed in flag leaf at anthesis and in grain at maturity. In both environments, gas exchange and fluorescence parameters varied markedly with irradiance and temperature. Analysis of their respective variation indicated the occurrence of photo-respiration and photo-inhibition, particularly in Tlaltizapan, the warmest environment, and in Siete Cerros. In Ciudad Obregon (high-yielding environment) lower Ci (internal CO2 concentration) and ΔLa (carbon isotope discrimination of the leaf) suggested a higher intrinsic photosynthetic capacity in the variety Bacanora. Higher yield of this genotype was also associated with higher Fv′/Fo′ (ratio of photochemical and non photochemical rate constants in the light) and Fm′/Fm (ratio of the non photochemical rate constants in the dark and light adapted state).

References (36)

  • D.F. Calderini et al.

    Genetic gains in wheat yield and main physiological changes associated with them during the 20th century

  • A.G. Condon et al.

    Genotypic variation in carbon isotope discrimination and transpiration efficiency in wheat. Leaf gas exchange and whole plant studies

    Aust J Plant Physiol

    (1990)
  • G.D. Farquhar et al.

    Isotopic composition of plant carbon correlates with water-use-efficiency of wheat genotypes

    Aust J Plant Physiol

    (1984)
  • G.D. Farquhar et al.

    Carbon isotope discrimination and photosynthesis

    Ann Rev Plant Physiol Plant Mol Biol

    (1989)
  • R.A. Fischer et al.

    Wheat yield progress associated with higher stomatal conductance and photosynthetic rates, and cooler canopies

    Crop Sci

    (1998)
  • T. Fuse et al.

    Characterisation of rice mutant having an increased susceptibility to light stress and high temperatures

    Physiol Plant

    (1993)
  • F.S. Girma et al.

    Osmotic adjustment in sorghum. II. Relationship to gas exchange rates

    Plant Physiol

    (1992)
  • P. Horton et al.

    Regulation of light harvesting in green plants

    Ann Rev Plant Physiol Plant Mol Biol

    (1996)
  • Cited by (57)

    • Response of maize photosynthesis to high temperature: Implications for modeling the impact of global warming

      2019, Plant Physiology and Biochemistry
      Citation Excerpt :

      Even though hybrids were adapted to regions with different temperature regimes, it was not possible to find any evidence of local adaptation to either high or low temperature treatments. For wheat, however, Monneveux et al. (2003) reported substantial genotypic variation in tolerance to high temperature when evaluating leaf photosynthesis. Even though there was no genetic variation in photosynthetic response to temperature, other evidence suggest that maize yield loss associated with increased temperature is overestimated if adaptation to temperature is not taken into consideration (Butler and Huybers, 2013).

    • Progress in genetic improvement of grain yield and related physiological traits of Chinese wheat in Henan Province

      2016, Field Crops Research
      Citation Excerpt :

      Both Pn and LAI were significantly correlated with PoAAA. The significant increase in Pn and LAI at 20 days after anthesis reflects the improvement of the tolerance to strong light radiation and high temperature of wheat in late filling stage of newly released cultivars (Monneveux et al., 2003; Zhao et al., 2007), indicating directional selection on wheat heat tolerance have been effective. Tolerance to strong light and high temperature is one of the important selection criterions in Henan province because dry hot wind occurs frequently in grain-filling stage there.

    View all citing articles on Scopus
    View full text