Evaluation of Drought Resistance of Four Garden Chrysanthemum Varieties Under Simulated Drought Stress With PEG 6000
Four varieties of garden Chrysanthemum were used as the test materials,and PEG 6000 was used to simulate drought stress.The effects of different concentration gradients(10％,15％,20％,and 25％)on the growth,photosynthetic,and physiological indicators of Chrysanthemum were studied,in order to provide reference for establishing a drought resistance evaluation system for garden Chrysanthemum.The results showed that drought stress significantly suppressed plant height and biomass.At a PEG 6000 concentration of 25％,the Pn,Tr and Gs of all four cultivars reached their lowest values.Ci generally exhibited an initial increase followed by a decrease.Relative electrical conductivity,MDA,Pro,soluble sugar contents,and POD activity all increased significantly,indicating an escalating level of cell membrane damage in Chrysanthemum plants.The levels of soluble protein and SOD in'Hong Zhenzhu''Mingliu Qianqiu'and'Beimeihong'initially rose before declining.CAT activity in'Hong Zhenzhu'and'Mingliu Qianqiu'also displayed an initial increase followed by a decrease.The drought resistance ranking among the four garden Chrysanthemum varieties was as follows,'Huangjin Shidai'＞'Hong Zhenzhu'＞'Beimeihong'＞'Mingliu Qianqiu'.
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