The growth and biochemical effects of different plant hormones on virus-free potato seedlings were studied in hope of providing theoretic basis for Potato Micro-tuber production. The results of the study showed that the plant hormones (1) greatly improved the root growth vigor and potentials of the potato seedlings and increased the root protein content of the seedlings; (2)Evidently increased the net photo-synthetic rate,dry matter,chlorophyll content as well as photosynthate accumulation of the seedlings; (3) Increased evidently the activities of SOD,POD,CAT and the free amino acid content and decreased the content of MDA; (4)Significantly promoted the potato seedlings which were better to have a mini-tuber number and yield per plant. Thereinto,with NAA at 100 mg/L,IBA at 50 mg/L and boric acid at 17. 5 mg/L, the photosynthetic pigment content, net photosynthetic rate, protective enzyme activities, free amino acid content of the seedlings were the most favorable and the mini-tuber number and yield per plant appeared the highest as well.%以‘早大白’马铃薯脱毒苗为试验材料,通过人工温室苗床栽培探讨外源激素萘乙酸(NAA)、吲哚丁酸(IBA)和硼酸生根处理对扦插脱毒苗生长和生理特征的影响,为马铃薯微型薯的实际生产提供理论依据.结果显示:(1)外源激素生根处理较对照扦插苗根系长势好,根活力、根系可溶性蛋白含量增加.(2)外源激素生根处理较对照脱毒扦插苗光合速率提高、叶绿素含量增加,光合物质的形成与积累增多.(3)外源激素生根处理较对照叶片SOD、POD、CAT活性和游离氨基酸含量均表现出不同程度的上升,MDA含量下降,衰老减缓.(4)外源激素生根处理有利于小区产量和单株结薯数的增加.研究表明,不同外源激素生根处理可改善脱毒马铃薯扦插苗农艺性状和生理指标,并以NAA 100 mg/L+IBA 50 mg/L+硼酸17.5 mg/L配方处理植株的长势最好,叶绿素含量、保护酶活性及游离氨基酸含量最高,净光合速率大、小薯膨大速度快且单株结薯数量及产量增加显著,更利于发挥脱毒薯的增产优势.
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