Effects of waterlogging stress on growth and physiology characters of ornamental sunflower seedlings

doi:10.14088/j.cnki.issn0439-8114.2020.09.017

Abstract

Abstract: Taking ornamental sunflower（Helianthus annuus L.） seedlings as materials, the effects of waterlogging stress on the morphology, physiology and root anatomy of ornamental sunflower seedlings were studied. The results showed that the plant height of ornamental sunflowers were significantly lower than the control （P﹤0.05）, and the roots were significantly less than that of control when they were waterlogged for 8 days. As for the concentrations of malondialdehyde（MDA） in ornamental sunflowers as measured at 0 d to 8 d of waterlogging, there was no significant difference compared with controls. The activity and proline content of superoxide dismutase（SOD） in ornamental sunflowers were significantly higher than that in the control group when the sunflowers were waterlogged for 2 days. The peroxidase（POD） activity, soluble sugar and soluble protein content in ornamental sunflower were significantly higher than those in the control group when waterlogged for 8 days. This indicates that the growth of ornamental sunflowers is inhibited by waterlogging stress, but it has a certain tolerance to waterlogging stress. On the one hand, it can resist waterlogging stress by increasing antioxidant enzyme activity and osmotic regulator content; on the other hand, it can adapt to waterlogging stress by forming aerenchyma in roots.

Key words: ornamental sunflower（Helianthus annuus L.）, waterlogging stress, morphology, physiological characteristics, anatomical structure

CLC Number:

LUO Jie, YUAN Long-yi. Effects of waterlogging stress on growth and physiology characters of ornamental sunflower seedlings[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(9): 86-90.

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