柑桔无病毒砧木扦插成功因子的研究

从美国引进的枳柚4475、枳橙卡里佐、特洛亚、尤马4种柑桔砧木,经测定对主要的柑桔病毒病有一定的抗性,无病毒。使用其嫩枝,从茎尖向下截成5cm长两段,剪去下部刺、叶,浸入不同的激素溶液中2小时,在玻璃温室内扦插,结果表:1.不同品种生根能力不同,以枳柚4475发根最好,卡里佐、特洛亚枳橙次之,尤马枳橙生根能力最差。生根难易与植株长势一致。2.200ppmNAA、200ppmIBA、200ppm2.4—D浸插条基部2小时,对生根有显著作用,枳柚4475经IBA处理生根率达84.3％,对照为55.0％。3个枳橙品种以2.4—D处理为佳,提高生根率20％左右。3.枝条下段用作插穗,生根能力显著强于上段,说明插穗达到一定成熟度,积累营养物质,有利生根。4.一定的高湿,适当的温度是促使扦插成功的重要因素。夏季扦插嫩枝应降温,注意土壤消毒。

STUDY ON THE SUCCESSFUL CUTTING FACTORS OF THE CITRUS VIRUS-FREE ROOTSTOCKS

The four rootstocks of citrumelo and citranges were virus-free, and resisting some citrus virus and virus-like pathogens, the green shoots were cut into two 5 cm segments from the tops. The thorns and leaves were removed from the bottom of every segment. The bases were immesed in regulator solutions two hours. Then were planted in the glass house. The experment results were below:1. Ther roting abilities were different among the rootstock varieties. Citrumelo 4475 rooted best. The second was Carrizo Citrange, then was Troyer Citrange. Yuma Citrange was the most difficulty for cutting. The experiment showed that the fast the plant grew, the easier it rooted. 2. NAA 200ppm, TBA 200ppm,2,4—D 200ppm had very excellent effects for the rooting. IBA was the best for Citrumelo 4475. The rooting percentage was 84.2%. However, the check was 55.0%. The three citranges showed the best with 2,4—D.About 20% rooting percentages were increased.3. The sections between 5—10cm from the tips of the shoots had excellent better han the top sections. This meant that the stems had certain mature, and the necessary materials were accumulated in sides were benifits for the cutting. 4. Besides moisture, the temperature was also very important for the rooting. Decreased the air temperature and sterilized the soil were very important for the successful cutting in the summer when the temperature was very high.