مقايسه پايه هاي مختلف مركبات براي ريزپيوندي

COMPARISON OF DIFFERENT CITRUS ROOTSTOCKS FOR MICROGRAFTING

Citurs fruits have a distinct economic importance in Iran and research effort to increase both quality and quantity of these fruits is valueable. Attempt has been made in this study to increase the percentage of successful micrografting. Micrografting is one of the advanced ways for production of virus-free citrus plants. Micrografting of ʹWashington Navelʹ orange on sour orange, lime, Poncirus, `Troyerʹ citrange, citromelo and `Flying Dragonʹ was investigated. The highest grafting precentge was obtained on `Troyerʹ citrange rootstock (40%), Also, sour orange resulted in a reasonable grafting percentage (33.3%), whereas poncirus was not successful. Rootstock fitness for micrografting 20 days after seed sowing had also remarkable results. Nearly 81.8% of ʹTroyerʹ citrange seedlings were ready to be grafted, while only 50.8% of Poncirus seedlings were ready at the same time. `Flying dragonʹ had the least grafting percentage (6.7%). Stem diameter at graft union was also different among the rootstocks. `Troyerʹ citrange with the mean stem diameter of 1.7 mm, performed the best, wherease lime had the lowest stem diameter (1.12 mm.). It can be concluded that `Troyerʹ citrange gave the best result in percentage of grafting success, due to suitability for grafting and good stern diameter in graft union and can be recommended as the best rootstock for micrografting.