S_(3307)和PP_(333)对龙眼实生苗生长发育和抗寒力的影响

EFFECTS OF S_(3307) AND PP_(333) ON THE GROWTH AND COLD-RESISTANCE OF LONGAN SEEDLINGS

本试验研究了两种三唑类植物生长延缓剂S_(3307)和PP_(333)对龙眼实生苗生长发育和抗寒力的影响,结果表明:1mg/L的S_(3307)和10mg/L的PP_(333)浸种、浸根均能促进幼苗根系的生长,显著提高根冠比,幼苗断根移栽时,S_(3307)和PP_(333)均能促进主根断口处萌发侧根,使幼苗迅速恢复生长发育,在低浓度下,S_(3307)的“控上促下”活性明显大于PP_(333),高浓度(S_(3307)>50mg/L,PP_(333)>100mg/L)会严重抑制幼苗生长,适宜浓度的S_(3307)和PP_(333)不仅可以加快龙眼砧木育苗速度,而且能明显提高幼苗对低温的抵抗能力。

The experiment was conducted to study the effects of S_(3307) and PP_(333) treatments on the growth and cold-resistance of Longan(Euphoria longana Lam. )Seedlings. The results showed that: both 1mg/L S_(3307) and 10mg/L PP_(333) enhanced the root growth and significantly increased the root/shoot ratio as compared with the control. When seedlings were transplanted with cut root, S_(3307) and PP_(333) distinctly increeased the amount of newly formed roots mear the cut surface. Under lower concentration, the effect of S_(3307) was stronger than that of PP_(333), however, higher concentration (S_(3307)>50mg/L, PP_(333)>100mg/L)severely restrained the growth of seedlings. We also observed that the electrolyte leakage from leaf of treated plants in cold stress (2±0.5)℃ was lower than that of the control.