Heat tolerance evaluation of different ochardgrass cultivars

In order to study the physiological response and heat tolerance of ochardgrass under high temperature stress, relative water content, chlorophyll content, relative electric conductivity (REC), proline (Pro), malondialdehyde (MDA), peroxidase (POD) and superoxide dismutase (SOD) of 6 cultivars of ochardgrass were analyzed with the artificial simulation of high temperature. The heat tolerance of 6 cultivars were comprehensively evaluated using fuzzy subordinate function. The results showed that chlorophyll content and relative water content decreased, REC, Pro and MDA increased and the activities of POD and SOD increased firstly and then decreased with the increase of the stress period. The fuzzy subordinate function analysis suggested that the heat tolerance of 6 cultivars decreased in the order of Athos Aldebaran 01472 Baoxing 02116 Amba.