三个苦瓜品种幼苗对淹水胁迫的适应性研究

Adaptation of Seedlings of Three Bitter Gourd Varieties Under Waterlogging Stress

以‘绿龙’‘绿先锋’和‘良苦1号’为试材,采用盆栽模拟淹水环境的方法,研究了不同淹水胁迫处理时间对3个苦瓜品种幼苗生长及生理的影响,以期筛选出耐涝型的苦瓜品种,为苦瓜的生产繁育提供参考依据。结果表明:与CK相比,淹水胁迫抑制了苦瓜幼苗生长,植株的株高生长量、生物量、叶绿素相对含量和根系活力均显著下降,叶片中的丙二醛、脯氨酸、可溶性糖含量和相对电导率等均显著上升。其中,‘良苦1号’茎基部诱导出的不定根数量、长度和干质量显著高于‘绿龙’和‘绿先锋’,淹水14 d时,‘良苦1号’生理指标的变化幅度均小于其他2个品种。通过隶属函数分析发现,3个品种的抗涝性表现为‘良苦1号’>‘绿龙’>‘绿先锋’,说明相较于‘绿龙’和‘绿先锋’,‘良苦1号’在淹水胁迫下更能适应生长,具有较强的耐受性。

‘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 14days 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.