Effects of Drought Stress and Rehydration on Physiological Characteristics of Hemerocallis fulva

doi:10.11924/j.issn.1000-6850.casb2022-0394

Abstract

Abstract:

To study the effects of drought stress and rehydration on the physiological characteristics of day lily (Hemerocallis fulva), the changes of relative water content, chlorophyll, relative electrical conductivity, antioxidant enzyme activity and osmotic regulation substances in leaves were measured by water control in pot culture to simulate drought and rewatering. The results showed that: (1) with the progress of drought stress, the leaf relative water content in mild, moderate and severe drought treatments decreased gradually, and recovered after rewatering, but still significantly lower than that of the control treatment (P<0.05). (2) The chlorophyll content increased at first and then decreased, and increased after rewatering. The chlorophyll content of mild and moderate drought stress treatments was not significantly different from that of the control group (P>0.05). (3) The relative conductivity was significantly higher than that of the control group (P<0.05) until 28 days, and the relative conductivity of each treatment group decreased significantly after rehydration. With the extension of stress time, the content of MDA in mild, moderate and severe drought treatments increased gradually, and decreased rapidly after rewatering, but it was significantly higher than that in the control group (P<0.05). (4) Soluble sugar and proline increased continuously in the three treatment groups. After rehydration, the contents of soluble sugar and proline in all treatment groups decreased significantly, but they were still significantly higher than those in the control group (P<0.05). (5) The activities of SOD, POD and CAT in each treatment group increased in varying degrees. After rehydration, the activities of POD, SOD and CAT in mild, moderate and severe drought treatments decreased, but still higher than the normal level.

Key words: Hemerocallis fulva, drought stress, rehydration, osmoregulation, antioxidase

WANG Yang, YU Senmiao, WANG Jingyang, SONG Hailong, LEI Yaodong, ZHANG Haiyan, LIU Bo. Effects of Drought Stress and Rehydration on Physiological Characteristics of Hemerocallis fulva[J]. Chinese Agricultural Science Bulletin, 2023, 39(19): 58-64.

Figures/Tables 9

References 35

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