乙烯利对国产杂交臂形草种子萌发及幼苗生长的影响

Effect of Ethephon on Domestic Brachiaria hybrid seeds Germination and Seedling Growth

【目的】研究外源激素乙烯利(ethephon,ETH)浸种对杂交臂形草(Brachiaria hybrid)种子萌发和幼苗生长的影响,以期筛选ETH浸种的最佳质量浓度,为生产实践提供技术支撑。【方法】以国产莫拉特Ⅱ杂交臂形草种子为试验材料,采用质量浓度为0(CK)、100、200、300、400、500和600 mg/L的ETH溶液浸种24 h,通过种子发芽试验和幼苗培养,探究ETH对种子萌发和幼苗生长的影响。【结果】6个质量浓度的ETH均能有效提高莫拉特Ⅱ杂交臂形草种子的发芽能力,种子发芽率与对照(CK)差异显著(P<0.05);400 mg/L ETH浸种24 h的效果最好,种子的发芽率、发芽势、发芽指数和活力指数分别是CK的3.64倍、2.45倍、2.97倍和6.43倍(P<0.05);300和400 mg/L ETH浸种24 h,幼苗生长发育最好,根长分别是CK的2.31倍和2.42倍,苗高均为CK的3.61倍(P<0.05)。【结论】400 mg/L ETH溶液浸种24 h能显著促进莫拉特Ⅱ杂交臂形草种子的萌发,同时也能较好地促进其幼苗生长发育,可在生产上推广应用。

[Purpose]To study the effect of the hormone ethephon(ETH)soaking seeds on improving the seed germination and seedling growth and development of Brachiaria hybrid,and to select the best ETH mass concentration to provide technical support for production practice.[Method]Tak-ing B.hybrid‘MulatoⅡ’seeds produced by domestic farmers,the mass concentrations were 0(CK),100,200,300,400,500 and 600 mg/L soak the seeds in ETH solution for 24 hours.Through seed ger-mination test and seedling culture,the effect of ETH on seed germination and seedling growth was ex-plored.[Results]Six mass concentrations of ETH treatments could effectively improve the germin-ation of‘MulatoⅡ’,compared with CK,all the germination rates had been improved(P<0.05).The germination rate,germinating energy,germination index and vitality index of seeds soaked with 400 mg/L ETH were significantly increased by 3.64,2.45,2.97 and 6.43 times than those of the CK(P<0.05).Seed soaking with ETH at the mass concentrations of 300 and 400 mg/L could significantly increase the root length and seedling height,which was 2.31 and 2.42 times,and both 3.61 times than those of the CK(P<0.05).[Conclusion]Seeds soaking in 400 mg/L ETH solution for 24 hours can promote the germination of B.hybrid‘MulatoⅡ’seeds and the growth and development of seedlings,and it can be applied in the production.