Abstract
High temperature stress on different varieties of lettuce seedlings in MDA, proline and soluble sugar content were studied. The results were as follows : With the stress temperature, varieties of leaf lettuce seedlings in the MDA, proline and soluble sugar content gradually increased; Different varieties had the most significant difference in 38/33℃(d/n). The increase of heat-resistant varieties on proline and soluble sugar content was quick and high, while its increase in MDA content was slow and small.
Highlights
Leaf lettuce (Lactuca sative L.) native to the Mediterranean coast liked the cold weather, and was prone to rot species, seedling difficult, easy bolting, perishable and other obstacles at high temperature, causing yield and quality difficult to achieve the desired goal
The increase of the content of MDA was related with varieties of heat resistance. 42/37°C (d/n), all varieties were higher the content of MDA, but compared with the control, varieties was no significant difference between the content of MDA of increase
J20 was 52.81%, and J2 was 13.82%, the most significant difference among varieties .42/37°C (d/n), the proline content of all varieties began to decrease, the increase of S24 and J20 was significantly higher than the control, while the S39 and J2 of the increase was not significant compared with the control. These results suggest that the content of proline was related with varieties of heat resistance, the heat-resistant varieties of proline content and growth were higher
Summary
Leaf lettuce (Lactuca sative L.) native to the Mediterranean coast liked the cold weather, and was prone to rot species, seedling difficult, easy bolting, perishable and other obstacles at high temperature, causing yield and quality difficult to achieve the desired goal. Fostering resistant varieties of leaf lettuce had to be resolved, and the problem of heat-resistant type of leaf lettuce seedling formation and growth was an important prerequisite for cultivating heat-resistant varieties. More heat tolerance of vegetable was cabbage[1,2,3], and the heat resistance of leaf lettuce on a rarely reported. Study of this experiment in heat stress conditions, the different varieties of leaf lettuce seedlings in the MDA, proline and soluble sugar content, was designed to heatresistant varieties of leaf lettuce to provide a theoretical basis.
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