摘要:
为了明确烟草漂浮育苗磷肥的适宜施用量,以烤烟品种“K326”为材料进行研究。结果表明,适量增施磷肥有利提高烟苗根系的长度、表面积、体积和根尖数,增强根系活力;极显著地提升烟苗的过氧化物酶(POD)、多酚氧化酶(PPO)和苯丙氨酸酶(PAL)的活性,增强了烟苗的抗逆性;显著地提高了烟苗叶绿素含量和光合性能,提升了烟苗的同化能力。因此,在烟草漂浮育苗过程中,施用15~18mg·株-1的磷素有利于培育根系健壮、抗逆性好、光合性能强的烟苗。
关键词:
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烤烟 /
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磷素 /
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根系形态特征 /
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叶绿素 /
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光合作用
Abstract:
Effect of application of varied amounts of phosphorus(P)on the growth and physiological characteristics of the seedlings of flue-cured tobacco K326 was studied.It was found that the length,tip,surface area,volume and rigor of the roots increased with increasing P at low levels.The activities of POD,PPO,PAL and stress resistance also increased significantly(P<0.01).In addition,the P fertilizations enhanced the chlorophyll content and net photosynthetic rate,as well as the assimilating capability of the seedlings.The amount of P appropriate for the seedling growth on a floating bed was determined to be 15-18 mg·plant-1.At this rate,the development of tobacco seedlings was shown healthy with strong roots,highly resistant to stresses and diseases,and desirable photosynthetic functions.
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