Study on the Effects of Water Stress on the Growth and Physiology of Lonicera caerulea Seedlings
[Objective]The objective of this study was to study the effects of water stress on Lonicera caerulea seedlings to determine the value of suitable water domain,and to provide a theoretical basis for water regulation in seedling production.[Method]Using one-year-old Lonicera caerulea cuttings as experimental materials and soil relative moisture content of 45%±5%as control,five water stress levels were set:mild drought,severe drought,mild flooding,moderate flooding,and severe flooding.Random samples were taken from each experimental group at 14,28,and 42 days to measure and analyze growth and physiological indicators.[Result]The results showed that low levels of water stress had no significant impact on seedling height,stem increment,and biomass accumulation,but all indicators in the severe drought and severe flooding treatment groups were significantly reduced.Chlorophyll,carotenoid content,and chlorophyll fluorescence parameters in the control group.The overall change was not significant,while the chlorophyll content and chlorophyll fluorescence parameters(Fv/Fm、ΦPS Ⅱ、qP and qN)of the other treatment groups decreased with the increase of stress time and level.The content of carotenoids shows a trend of first increasing and then decreasing under low levels of water stress.Water stress significantly increased the content of MDA,SS and PRO,as well as the activity of SOD and CAT.POD activity shows a trend of first increasing and then decreasing under low levels of water stress.[Conclusion]Lonicera caerulea seedlings have strong waterlogging resistance and certain drought resistance.When the relative soil moisture content is between 45%～90%,the plants can grow normally.
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