【摘要】 为给迷人杜鹃的抚育管理提供参考,采用盆栽法人工模拟光照条件,探索不同遮阴处理对迷人杜鹃种子萌发和芽苗生长的影响试验。结果表明:迷人杜鹃种子萌发率和萌发指数在30%遮阴处理时达到最大,分别为90.00%和2.46;随着光照的减弱而逐渐减小,在80%遮阴处理下最小,为40%和0.27。弱光照对种子萌发进程有一定的延迟作用,萌发活力指数随着光照的减弱而减小。不同遮阴处理的迷人杜鹃芽苗具有较大的形态学可塑性,30%遮阴处理的芽苗胚根长、胚轴长、芽苗活力指数和幼叶宽均最大,分别比全光照提高60.71%、29.91%、52.26%和33.33%;80%遮阴处理最小,分别比全光照降低59.09%、54.88%、74.32%和66.67%。随着遮阴度的增加,幼苗的根系活力降低,而总叶绿素含量先上升后降低,根系活力以30%遮阴处理最大,为3.49mg/(g·h);MDA含量以80%遮阴处理最大,为13.42nmol/g FW;叶绿素含量以50%遮阴处理最大,为75.32μg/g。遮阴度为30%的光照环境有利于迷人杜鹃盆栽育苗。更多还原

【Abstract】 To provide references for the R.agastumtending management,apot culture experiment with artificial simulation of light conditions was conducted to explore the effects of different shading treatments on seed germination and seedling growth of R.agastum.Results:The seed germination rate and germination index of 30% shading treatment were the highest,respectively 90.00% and 2.46,and gradually decreased with decreasing light intensity,then reached the minimum at 80%shading treatment,respectively 40% and 0.27.Weak light put off seed germination process in certain degree,germination vigor index decreased with weakening light intensity.R.agastum with different shading treatment had great morphological plasticity,radical length,hypocotyl length,vigor index and young leaf width of 30%shading treatment were the highest,which were respectively 60.71%,29.91%,52.26% and 33.33%higher than full light treatment,that of 80% shading treatment were the lowest,59.09%,54.88%,74.32% and 66.67% lower than full light treatment respectively.With increasing the shading degree,seedling root vigor decreased,while total chlorophyll content first increased and then decreased,root vigor of 30% shading treatment was the highest[3.49 mg/(g·h)],MDA content of 80% shading treatment was the highest(13.42nmol/g FW),chlorophyll content of 50%shading treatment was the highest(75.32μg/g).30% shading treatment was beneficial for pot culture of seedlings of R.agastum.更多还原