水杨酸对移栽后烟株早生快发的影响

为促进移栽后烟株的早生快发，以‘K326’为试验材料，采用温室大棚漂浮育苗，在幼苗长至3~4叶1心时，叶面分别喷施0、0.5、1.0、1.5 mmol/L的水杨酸，成苗后移栽至大田。结果表明，水杨酸通过增强抗氧化系统的活性，及时有效的清除活性氧，为移栽后烟株快速适应变化的环境提供有利的条件，从而促进烟株根系的快速发育、增强根系活力和根冠比，最终缩短烟株的还苗期，促进早生快发，为后续的快速生长和干物质积累奠定基础。水杨酸浓度不同，作用效果不同，1.0和1.5 mmol/L浓度的作用效果好于0.5 mmol/L。

Effects of Salicylic Acid to Early Growth and Quick Tillering of Transplanted Tobacco (Nicotiana tabacum L.) Plants

In order to accelerate early growth and quick tillering of transplanted tobacco plants, experimental material ‘K326’ seedlings were floated in greenhouse. Spraying 0, 0.5, 1.0, 1.5 mmol/L salicylic acid on foliar respectively when the seedlings with three or four leaves. Then the grown seedlings were transplanted into field. The results showed that transplanted tobacco plants can adapt to the changed environment quickly after treated by salicylic acid because it can increase the activity of antioxidant system and then remove reactive oxygen species ROS timely and effectively. So salicylic acid can promote the development of root system rapidly, strengthening the root vigor and increasing root-shoot ratio. The result is rosette stage was shorted; early growth and quick tillering were accelerated of transplanted tobacco plants. All of those were beneficial to tobacco plants subsequently grow and accumulate dry matter rapidly. Effects of four different salicylic acid concentrations were different. The effects of 1.0 and 1.5 mmol/L concentration were better than 0.5 mmol/L.