effect of auxin treatments and cutting position on rooting of pear cultivars (sebri , shekari and natanz) cuttings

abstract an investigation was accomplished during 2007 and 2008 to test effect of hormonal treatment and cutting position on rooting of sebri , shekari and natanz cultivars of pear (pyrus pyrifolia.) the experimental design was a two way factorial in a completely randomized method and with pgr5 treatment (iba and iba with naa in four levels in the first year and four higher levels of iba in second year) and position of cuttings on stem ( in two levels: terminal and basal ) in three cultivars with six replications per treatment. analysis of data in the first year of experiment shown that the concentration of 3 ppm iba was statistically increased rooting percentage and root length in both terminal and basal cuttings of natanz cultivar. it also increased root number per cutting only in terminal cuttings of natanz cultivar. hormonal treatments did not shown any significantly callusing and rooting of sebri and shekari cuttings. also observation of experiment in second year denote that basal cuttings of sebri cultivar only in 500 mg/l iba had a callus production of 40 %. analysis of data for this year revealed that treatment of 100 mg/l iba induce 75 % of rooting in natanz cultivar and had the most value in both root number and root length.