Title: Effects of Heat Stress on Growth and Physiology of Marigold Cultivars
Abstract: The effects of high temperature 38℃/21℃(day/night)on plant growth,leaf chlorophyll content,relative electric conductivity(REC),malon dialdehyde(MDA)content,relative water content(RWC),the activities of superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)and ascorbate peroxidase(APX)were investigated in 9 marigold cultivars.The results showed that 9 cultivar seedlings showed different degrees of damage symptom under high temperature for 4 days.MDA contents and REC increased significantly,whereas leaf chlorophyll content,RWC and APX decreased under high temperature treatment,which also increased SOD,POD and CAT activities.The path coefficient analysis showed a significantly positive correlation between REC and heat injury index,but significantly negative correlations between SOD,POD and CAT activities and heat injury index.The heat tolerance of the tested9 cultivars decreased in the order of'Discovery','Chokdee','Giant','Gate Gold','Great Hero','Janie','Durango','Little Hero'and'Bonanza'.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 3
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