绿豆品种资源萌发期耐碱性鉴定

采用人工气候箱内培养皿培养,以混合碱Na HCO3∶Na2CO3(摩尔比)为9∶1模拟典型东北地区碱胁迫环境,在萌发期以50 mmol L–1溶液处理34份绿豆品种资源,蒸馏水处理为对照,每培养皿放30粒种子。培养第3天测定发芽势,第7天测定发芽率、下胚轴长、胚根长、下胚轴干重、胚根干重等指标,通过隶属函数法和聚类分析对参试材料耐碱性综合评价,并进行因子分析。利用隶属函数法对参试材料耐碱性排序表明,不同绿豆品种资源间表现出较大差异,聚类分析把参试材料按耐碱性强弱分为4大类,白绿11等9份材料为耐碱类型,公绿1号等19份材料为耐碱中间类型,吉绿3号等5份材料为碱敏感类型,潍绿7号为碱极敏感类型。因子分析结果表明,萌发指数、下胚轴干重、胚根长分别在萌发因子、生物量累积因子和伸长因子中的负荷量最大,可作为绿豆萌发期耐碱性鉴定的适宜指标。

Identification of Alkali Tolerance of Mungbean Germplasm Resources during Germination

Mixed alkali (NaHCO₃ : Na₂CO₃ with the mole ratio of 9 : 1) was used to simulate the typical alkali stress environment in Northeast China. The seeds of 34 accessions of mungbean germplasm resources were treated with 50 mmol L^–1 solution with distilled water as control and germinated in petri dishes for seven days. The germinating energy was measured on the third day and the germination rate, hypocotyl length, radicle length, hypocotyl dry weight, and radicle dry weight were measured on the seventh day. Through the subordinative function analysis, clustering analysis, and factor analysis, the alkali tolerance of 34 mungbean materials were evaluated. All of the materials based on subordinative function were clustered into four groups: nine accessions were tolerant to alkali, e.g. Bailyu 11, 19 accessions had midium tolerance, e.g. Gonglyu 1, five accessions were sensitive to alkali, e.g. Jilyu 3, and Weilyu 7 was strongly sensitive to alkali. The vigor index, hypocotyl dry weight, and radicle length were the most significant indexes which are recommended as the suitable indexes for identifying alkali tolerance of mungbean at germination. The results lay a foundation for alkali tolerance gene mining and variety improvement in mungbean.