3种禾本科牧草萌发期和苗期的抗旱性研究

目的]研究3种禾本科牧草萌发期和苗期的抗旱性。方法]以特高多花多年生黑麦草、贝斯利斯克伏生臂形草及普通型狗牙根3种禾本科牧草为试验材料,采用PEG6000模拟干旱胁迫,测定不同PEG胁迫下各草种的发芽率、发芽势、叶片含水量、电导率、丙二醛含量等指标,探究3种禾本科牧草在昆明地区的抗旱性。结果]干旱胁迫下,普通型狗牙根的发芽率和发芽势显著高于其他品种,并且其隶属函数均值最大。与对照相比,PEG胁迫对3种禾本科牧草发芽率、发芽势、叶片含水量、电导率、丙二醛含量的影响达到显著水平(P0.05)。结论]3种禾本科牧草中,抗旱性最强的是普通型狗牙根。因此,普通型狗牙根可作为昆明地区首选抗旱品种。

Study on the Drought Resistance of Three Kinds of Gramineae Forage in the Germination and Seedling Stages

Objective]To study the drought resistance of three kinds of Gramineae forage in the germination and seedling stages.Method] Taking three kinds of Gramineae forage(Brachiaria decumbens Stapf,Lolium perenne and Cynodon dactylon as test materials,PEG6000 was used to simulate drought stress.The germination rate, germination potential, leaf water content, electrical conductivity, malondialdehyde(MDA) content and other physiological indexes under different PEG stress were determined.And the drought resistance of three kinds of Gramineae for-age was studied.Result]Under drought stress, the germination rate and germination potential of Cynodon dactylon were significantly higher than that of other varieties,and its membership function value was the highest.Compared with CK,PEG stress had significant effects on the ger-mination rate,germination potential, leaf water content, electrical conductivity, MDA content of three kinds of Gramineae forage(P<0.05). Conclusion]Among three kinds of Gramineae forage,Cynodon dactylon had the strongest drought resistance.Therefore,Cynodon dactylon can be used as the first choice of drought resistant varieties of turfgrass in the Kunming area.