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GrainGenes Reference Report: JPY-160-657

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Reference	JPY-160-657
Title	Limitations to photosynthesis under light and heat stress in three high-yielding wheat genotypes
Journal	Journal of Plant Physiology
Year	2003
Volume	160
Pages	657-666
Author	Monneveux P Pastenes C Reynolds MP
Abstract	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 (delta) 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 C(i) (internal CO2 concentration) and deltaL(a) (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)
Keyword	[ Hide all but 1 of 28 ] aestivum carbon dioxide chemical constituents of plants chlorophyll environment flowering gas exchange gas-exchange genetic variation genotypes grain crops grains heat heat stress high yielding varieties leaf light photoinhibition photorespiration photosynthesis plant pigments plant stress stress temperature triticum aestivum varieties wheat yield

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