Adaptation of Seedlings of Three Bitter Gourd Varieties Under Waterlogging Stress
'Lyulong ''Lyuxianfeng ' and 'Liangku 1 ' were used as test materials.The effects of different waterlogging stress treatment times on the growth and physiology of seedlings of three bitter gourd varieties were investigated by using pots to simulate waterlogging stress environment,in order to screen out waterlogging-tolerant bitter gourd varieties and provide reference for the production and breeding of bitter gourd.The results showed that compared with the control,waterlogging stress inhibited the growth of bitter gourd seedlings,and the plant height growth,biomass,relative chlorophyll content and root vigor were all significantly decreased.The malondialdehyde,proline, soluble sugar content and relative conductivity in leaves were all significantly increased.Among them, the number,length and dry weight of adventitious roots induced at the stem base of 'Liangku 1'were significantly higher than those of 'Lyulong'and 'Lyuxianfeng',and at 14 days of waterlogging,the changes in physiological indexes of 'Liangku 1 'were smaller than those of the other two varieties. Through membership function analysis,the waterlogging resistance of three varieties was ranked as'Liangku 1 '>'Lyulong'>'Lyuxianfeng'.These results indicated that,compared with 'Lyulong'and'Lyuxianfeng ','Liangku 1 ' was more adaptable to growth and had stronger tolerance under waterlogging stress.
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