不同银合欢种子萌发期耐旱性鉴定

Study on drought resistance dentification of Leucaena leucocephala at germination stage

以15%PEG(聚乙二醇)溶液作为渗透介质,对98份银合欢种质进行萌芽期人工水分胁迫试验。结果表明:PEG胁迫降低了银合欢种质的发芽率、发芽指数、活力指数、根重、芽重、根长、芽长,种质间表现出较大差异。对相对发芽势、相对发芽率、相对根长、相对芽长、相对根重、相对芽重、萌发抗旱指数6个指标应用模糊隶属函数法进行耐旱性综合评价,发现抗旱型种质有银合欢070108001、CIAT7930、CIAT17492、CIAT7384、070113002、CIAT9438、CIAT17488、hybrid86、菲19、050307504、070110015、050217064、050302442,不抗旱型种质包括银合欢061021037、hybrid122、CIAT17474、070315004,其余81份银合欢种质为中间型。

An experiment of simulated water stress was carried out on 98 Leucaena leucocephala accessions with 15%PEG-6000 solution as permeating medium. The results showed that the germination rate, germination index, vitality index,the length and weight of embryonic bud and embryonic root decreased and varied considerably under PEG stress. On the base of 7 indexes including relative germination energy, relative germination rate, relative root and bud length, relative root and bud weight and germination drought-resistance index, the comprehensive evaluation of drought-tolerance with fuzzy membership function method found that drought-tolerant accessions included L. leucocephala 070108001, CIAT7930,CIAT17492, CIAT7384, 070113002, CIAT9438, CIAT17488, hybrid86, FEI19, 050307504, 070110015, 050217064 and050302442, while non-drought-tolerant accessions included L. leucocephala 061021037, hybrid122, CIAT17474 and070315004, and the rest 81 L. leucocephala accessions fell in middle type.