Heat Tolerance of Plants definition of Heat Tolerance of Plants in the Free Online Encyclopedia.

Heat Tolerance of Plants

or heat resistance of plants, the ability of plants to withstand excess heat. Some bacteria, for example, grow well at 50°-65°C and die only at 70°-80°C. Succulents are the most heat-tolerant of the flowering plants; some cacti can withstand overheating to 55°-65°C, and mesophytes can tolerate temperatures to about 45°C. The heat tolerance of thermophile microorganisms is due to their high metabolic rate, and it increases with an increasing content of ribonucleic acid (RNA), which consists of a protein that is much more resistant to thermal coagulation than most proteins. Many xerophytes and mesophytes tolerate high temperatures well because of intensive transpiration. Succulents do so because of their low metabolic rate, highly viscous cytoplasm, and large content of bound water. Both the high viscosity of cytoplasm and the high content of RNA as a protein-synthesizing factor play a role in mesophytes. Heat tolerance changes with time; in annuals and biennials, it decreases when the generative organs are formed. Heat tolerance can be increased before planting by the hardening of plants against drought, the gradual hardening of seedlings, and the treatment of seeds with a 0.2 percent calcium chloride solution.

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No references found			heat rate heat reactor heat recovery Heat Regime of Soil heat release Heat Resistance Heat Resistance and Thermal Stability of Polymers heat run heat seal heat set Heat Setting heat shield heat shock protein heat shock response heat shunt heat sink heat slug heat source heat sterilization heat storage heat stress index Heat Supply heat thunderstorm heat time heat tinting Heat Tolerance of Plants Heat Transfer Heat Transfer at a Solid-Fluid Interface heat transfer coefficient Heat Transfer in Soil Heat Transfer in the Atmosphere Heat Transfer in the Ocean heat transmission Heat Transmission Between Heat-Transfer Fluids heat transmission coefficient heat transmittance heat transport heat treatment Heat Treatment of Metals Heat Value heat wave heat wheel Heat, Quantity of heat-absorbing glass heat-activated adhesive heat-activated battery heat-affected zone heat-fusion joint heat-insulating glass heat-loss flowmeter heat-reflective glass			Heat Source Heat Source heat stabile Heat Stable Function Heat Sterilizable Potting Compound heat sterilization Heat storage heat stress disease heat stress disease heat stress disease Heat Stress Index Heat Stress Index Heat stress-forms in increasing severity heat stroke heat stroke heat stroke heat stroke Heat Supply heat sync heat sync Heat tape Heat Tempering Tank Heat therapy Heat therapy Heat therapy Heat therapy Heat therapy heat thunderstorm heat time heat tinting Heat Tolerance of Plants Heat Tolerance Test on Days 1 Heat trace Heat Tracing Control Module Heat Tramsfer 1 Heat transfer Heat transfer Heat Transfer 2 Heat Transfer 3 Heat Transfer and Fluid Flow Group Heat Transfer and Release Coating Heat Transfer Area Heat Transfer at a Solid-Fluid Interface Heat transfer coefficient Heat transfer coefficient Heat transfer coefficient Heat Transfer Compound Heat Transfer Compound Heat Transfer Division Heat transfer fluid Heat transfer fluid Heat transfer fluid Heat transfer fluid Heat Transfer in Soil Heat Transfer in the Atmosphere Heat Transfer in the Ocean Heat Transfer Label Heat Transfer Label Heat Transfer Labels Heat Transfer Laboratory Heat Transfer Loop