Abstract
The effects of waterlogging on antioxidant enzyme activities responses in five different lines, i.e. ABA-deficient mutant (0673) and its control (0535), two ABA over-production transgenic rd29A:NCED1 lines (#2, #7) and Mill. L. cv. New Yorker (WT) were investigated. The waterlogging was mimicked by treating pot plants with flooding. The malondialdehyde (MDA) content, superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) activity in the leaves were evaluated in all treatments. The results showed that after 7 days waterlogging treatment, the malondialdehyde (MDA) was increased in all plants, especially in LA0673. Compared with the LA0673, #2 and #7 significantly increase the activities of SOD, POD and CAT under waterlogging stress. Therefore, ABA could improve the waterlogging tolerance of tomato by increasing the activities of antioxidant enzymes under waterlogging stress.
Highlights
In the life history of plants, they are inevitably threatened by environmental, such as waterlogging, salt, drought, extreme temperature stress and so on
Malondialdehyde, which is the final product of lipid peroxidation, the content of MDA in cells reflects the level of formation damage induced by lipid peroxidation, and it can be used to judge the degree of plant environment stress response [15]
The activity of superoxide dismutase (SOD) could be stimulated in plants under waterlogging stress and reduced the damage caused by ROS, and the activity of antioxidant enzymes was positively correlated with the antioxidant capacity of plants under waterlogging [20]
Summary
In the life history of plants, they are inevitably threatened by environmental, such as waterlogging, salt, drought, extreme temperature stress and so on. With the deterioration of the global environment, the uneven distribution of rainfall leads to the frequent occurrence of disasters such as heavy rains and floods in several regions[1]. Soil waterlogging disrupts the water balance in plants, leading to oxygen restriction in plant roots[2]. Hypoxia causes root systems to eventually rot, over ground parts to wilt, even resulted in death of plants[3].Tomato (Lycopersicon esculentum Mill.) is a herbacary plant of Solanaceae and Solanum, native to South America, and widely distributed in China, it is cultivated all over the north and south. Tomato have high economic benefit in horticultural crops. Studies on diseases have shown that eating more tomatoes, related product can effectively reduce the risk of cancer, cardiovascular and cerebrovascular diseases and other chronic diseases[4,5,6]
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