温度对翠竹种子萌发及幼苗生长发育的影响OA

[Objective]Temperature serves as a fundamental environmental determinant that profoundly influences seed germination physiology and subsequent seedling establishment in vascular plants.In order to explore the influence of temperature on the seed germination and seedling growth of Pleioblastus pygmaeus,so as to better understand the seed germination characteristics of bamboo plants and the growth and development law of seedlings at leaf-expansion period,and to provide theoretical and practical basis for the seedlings afforestation of P.pygmaeus.[Method]Taking the seeds of P.pygmaeus as experimental materials,the seeds were cultivated by pot-culture method.The characteristics of seed germination and seedling growth were studied in detail by gradient temperature control test(temperature ranged from 16 to 30 ℃).[Result](1)With the increase in culture temperature,the germination percentage and germination potentiality of P.pygmaeus seeds initially increased and then decreased.The optimum germination temperature range of P.pygmaeus seeds was 24-28 ℃,among which 24 ℃ was the optimum germination and emergence temperature of P.pygmaeus.Under the optimum germination temperature,the germination rate and germination potential are high,the germination speed is fast and the germination is neat.With the increase in temperature,the initial germination time and average germination time of P.pygmaeus seeds are shortened.(2)The growth rate of P.pygmaeus increased with the increase in temperature,and temperature has a linear relationship with the development rate.According to the linear regression equation,the low-temperature threshold and effective accumulated temperature of P.pygmaeus were predicted.(3)Temperature had significant effects on leaf height,root growth characteristics and biomass accumulation of P.pygmaeus seedlings.The leaf height of P.pygmaeus seedlings decreased with the increase of temperature.Generally speaking,22-26℃is the optimum growth temperature range of P.pygmaeus seedlings.[Conclusion]In this study,we determined the optimum temperature range of 24-28 ℃ for seed germination of P.pygmaeus,and established the quantitative relationship between development rate and temperature.The research results provide a theoretical basis for the conservation of P.pygmaeus germplasm resources,artificial seedling raising and cultivation management,and are of great significance in guiding the practice of seed introduction and cultivation and assessing ecological adaptability.