The temperature sensitivity of guard cell respiration CO- segregates with stomatal conductances in a F2 population of pima cotton
Conference
·
· Plant Physiology; (United States)
OSTI ID:6281473
- Univ. of California, Los Angeles (United States)
Stomatal conductances in lines of Pima cotton selected for higher yields and heat resistance increase as a function of selection. Lines with contrasting rates of stomatal conductances also have contrasting rates of guard cell respiration and proton pumping. In this work, we studied stomatal conductances and guard cell respiration rates in a F2 population of a cross between S-6, a heat-resistant, high yielding line, and B368, a heat sensitive primitive cotton. F2 plants were grown in a greenhouse (temperature=30[degrees]C at noon) and a growth chamber (12 h light, 40[degrees]C/12 h dark 28[degrees]C). conductances were 3-fold higher at 40[degrees]C than at 25[degrees]C in greenhouse-grown plants and 4-fold higher in growth chamber-grown plants. The range of stomatal conductances in segregating F2 plants increased sharply with temperature, indicating that the genetic differences between the parental populations are better expressed at high temperature. Respiration rates of guard cells measured in mechanically isolated, enzymatically cleaned epidermis, co-segregated with stomatal conductances. Plants with high stomatal conductances had high rates of guard cell respiration. The slope of guard cell respiration as a function of temperature increased linearly with stomatal conductances. The co-segregation of rates of guard cell respiration and stomatal conductances indicates that both properties are under genetic control, and that guard cell respiration is a component of the sensory transduction of the stomatal response to temperature.
- OSTI ID:
- 6281473
- Report Number(s):
- CONF-9307119--
- Conference Information:
- Journal Name: Plant Physiology; (United States) Journal Volume: 102:1
- Country of Publication:
- United States
- Language:
- English
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