9. Plant Tolerance to Drought and High Temperatures: Physiological Mechanisms and Approaches for Screening for Tolerant Genotypes

Both drought and high temperatures are among the main factors limiting crop productivity in Bulgaria, therefore screening and selection of tolerant genotypes is a key approach for sustainable agriculture. In the present review-paper the physiological mechanisms used by plants to cope with the shown stress factors are described briefly as well as approaches for screening for tolerant genotypes. Suitable scientific equipment for screening investigations is also indicated.