基于隶属函数法的江苏沿海地区羊角椒种子萌发期耐盐碱性综合评价

Comprehensive Evaluation of Saline-alkali Tolerance on Seeds of Sheep-horn Pepper in Jiangsu Coastal Area Based on Membership Function Method

为了解江苏沿海地区羊角椒对盐碱环境的耐胁迫能力,以2种羊角椒品种(盐东羊5号、盐东羊13号)为试材,采用不同浓度的Na_(2)CO_(3)溶液(0、5、10、20、30、40 mmol/L)对羊角椒种子进行盐碱胁迫,分析其萌发性状,并运用隶属函数法对不同羊角椒品种的耐盐碱性进行综合评价。结果表明:在不同浓度Na_(2)CO_(3)的胁迫下,发芽指标(除盐东羊13号的发芽指数外)和生长指标均随浓度的增加呈现先上升后下降的趋势。在Na_(2)CO_(3)浓度为5 mmol/L时,2个品种的发芽势和活力指数等发芽指标均较对照增加,胚根长、胚芽长和鲜质量等生长指标也较对照有所提高;而Na_(2)CO_(3)浓度≥20 mmol/L时,2个品种的各项发芽指标较对照均出现下降趋势,相对盐害率则大幅度提升,生长指标等性状也有所降低,与Na_(2)CO_(3)浓度呈负相关变化,根长抑制率、芽长抑制率和鲜质量抑制率较对照均极显著升高。采用隶属函数法对各项指标进行综合分析可得,低盐碱条件下盐东羊5号品种的耐盐碱性较好,适宜范围内的高盐碱条件下则是盐东羊13号品种表现更好。

In order to understand the stress tolerance ability of sheep-horn pepper in coastal areas of Jiangsu to saline-alkali environment,two cultivars of sheep-horn pepper('Yandongyang No.5'and'Yandongyang No.13')were used as test materials,and different concentrations of Na_(2)CO_(3)(0,5,10,20,30,40 mmol/L)were subjected to saline-alkali stress on the seeds of sheep-horn pepper to determine the germination traits of the seeds,and the saline-alkali tolerance of different cultivars of sheep-horn pepper was comprehensively evaluated by the membership function method.The results showed that under the stress of different concentrations of Na_(2)CO_(3),both the germination indexes and the growth indexes showed a trend of increasing first and then decreasing(except germination index of'Yandongyang No.13').When the c(Na_(2)CO_(3))=5 mmol/L,the germination indexes such as germination potential and vigor index showed increase compared with the control,and the growth indexes such as radicle,germ and fresh weight were also improved compared with the control.When the c(Na_(2)CO_(3))≥20 mmol/L,the germination indexes of the two cultivars showed a significant downward trend compared with the control,while the relative salt damage rate increased greatly,and the growth indexes also began to decrease,which was significantly negative correlation with the Na_(2)CO_(3) concentration.The root length inhibition rate,shoot length inhibition rate and fresh weight inhibition rate all significantly increased.The membership function method was used to comprehensively analyze the indicators,and it was found that the saline-alkali tolerance of'Yandongyang No.5'was better under low salinity conditions,and the performance of'Yandongyang No.13'was better under high salinity conditions of the appropriate range.