Effects of Different Plant Growth Regulators on Seed Germination and Seedling Growth of Coffea liberca
In this study,the seeds of Coffea liberica were soaked with different concentrations of GA3,6-BA,IAA and 2,4-D for 24 hours,and the germination rate,germination potential,germina-tion index,plant height,stem diameter,fresh weight,SOD,POD,CAT,MDA and chlorophyll con-tent were determined.The effects of different plant growth regulators on seed germination,seedling growth and physiological characteristics of large coffee were studied.The results showed that 25 mg/L GA3 had the best effect on the fresh weight of Coffea liberica seedlings.50 mg/L GA3 could signif-icantly shorten the germination duration of the seeds.75 mg/L GA3 could effectively reduce germina-tion start-up time and promote taproot growth of seedlings.25 mg/L 6-BA had the best effect on leaf length and width,and significantly increased SOD activity and inhibited MDA production.The effect of 25 mg/L IAA on seedling height was the highest.25 mg/L 2,4-D could significantly improve the germination rate,germination potential,germination index,vitality index,emergence rate,stem di-ameter and POD activity of Coffea liberica.Overall comparison showed that 25 mg/L 2,4-D had the best effect on seed germination and seedling growth of Coffea liberica.
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