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通过对20%PEG处理种子96 h后的胚芽伸长速度、种子吸水速率、种子萌发胁迫指数等3项抗旱性指标的测定,并采用抗旱性综合评价法,评价了狗牙根(1号)、波特鸭茅(2号)、德梅特苇状羊茅(3号)、黑籽雀稗(4号)4种禾本科牧草种子的抗旱性能。用20%PEG处理种子96 h后的胚芽伸长速度评价4种牧草种子的抗旱性,其抗旱性由强至弱的顺序为:3号>2号=4号>1号;用种子吸水速率评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:2号>4号>3号>1号;用种子萌发胁迫指数评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:3号>1号>4号=2号;用综合评价方法评价4种牧草种子的抗旱性,抗旱性由强至弱的顺序为:3号>2号>4号>1号。
The germination rate, seed water absorption rate and seed germination stress index of three drought resistance indexes were measured after 20% PEG treatment for 96 h, and the resistance of bermudagrass (No.1) Drought resistance of four species of gramineous herbage seeds such as Porter Dactilla (No. 2), Demete tall fescue (No. 3) and barley nutcracker (No. 4) The germination rate of four kinds of forage seeds was evaluated by the germination speed of germinated seeds treated with 20% PEG for 96 h. The order of drought resistance from strong to weak was: No.3> No.2 = No.4> No.1; the seed water absorption rate The order of drought resistance and drought resistance of four forage grasses was evaluated as follows: No.2> No.4> No.3> No.1. The drought resistance and drought resistance of four forage seeds were evaluated by seed germination stress index from strong Weak order is: No. 3> No. 1> No. 4 = No. 2; using the comprehensive evaluation method to evaluate the drought resistance and drought resistance of the four kinds of forage seeds, the order from strong to weak is No.3> No.2> No.4> 1 number.