柱花草太空育种后代种子萌发期抗旱性研究

以不同渗透势的PEG(6000)溶液模拟水分胁迫条件，研究了柱花草28个品系的耐旱能力。结果表明院较高PEG浓度(20%)明显抑制28个品系胚根和胚芽的生长及种子发芽率、发芽势、发芽速度、抗旱指数和活力指数的提高；PEG浓度对胚芽生长的抑制效应比胚根大；各品系的发芽率、发芽势、活力指数和萌发抗旱指数均随PEG浓度的增加显著降低(P＜0.05)。采用模糊隶属函数法对上述7个指标的耐旱性进行综合评价，结果显示9804-4-8、9803-1-16、9803-1-19号品系较为耐旱，9809-54-5、五队224-2、9804-16-1为不耐旱品系，而对照为中等耐旱品系。

Application of RAPD to Pennisetum,a Forage Resource

Seeds from the progenies of 26 species of Stylosanthes(stylo) induced from space flight and of 2 control species were collected and germinated under different concentrations of polyethylene glycol 6000 (PEG 6000) solution. The results of seed germination indicated that higher PEG concentration (20%) inhibited significantly the growth of radicles, plumules, seed germination rate, germination velocity, germination potential, vigor index and promptness index of these 28 species. The PEG concentration treatments had a higher inhibiting effect on plumule growth than on radicle. The germination rate, germination potential, promptness index and vigor index of each species decreased significantly with increased PEG concentration (P< 0.05). All the indicators aforementioned were evaluated comprehensively in terms of drought resistance by using the Fuzzy Memberships Function method. The species 11, 3, and 1 were found relatively higher in drought resistance, the species 18, 24, and 25 lower, and the control species (27, 28) middle.