Studies on Vegetative Propagation of Some Guava Seedling Trees by Stem Cuttings As Influenced By Their Genotypes and Some Growth Regulators

This study was conducted in glass house at Horticulture Research Institute, Agricultural Research Centre, Giza during both 2018 and 2019 experimental seasons to investigate the possibility of using leafy wood stem cuttings of 10 selected guava seedlings trees for using to propagate them vegetatively. Whereas, rooting ability of their cuttings in response to genotypes and dipping in 4000 ppm IBA and 100 ppm TIBA were investigated. Besides some growth measurements i.e., number of both roots and shoots per rooted cuttings and their length, as well as No. of leaves per each and average leaf area were also included. Data obtained during both seasons cuttings of only five genotypes (seedling trees) succeeded to root while other fives completely failed. On the other hand ability of the leafy soft wood stem cutting of the five succeeded genotypes varied specifically from one seedling tree to another.  Hence tree No. 10 was the superior while both 7^th and 8^th ones were the inferior and two other trees (No. 2 & 6) were in between. The specific effect of growth regulators mired was also observed TIBA was more effective than IBA especially during 2^nd season whereas difference was significant. In addition, the most effective combination was always in closed relationship to the dipped cuttings of genotype 10 in TIBA 100 ppm fallowed by cuttings of the same trees treated by IBA 4000 ppm. Throe of dipped cuttings in either IBA or TIBA 100 ppm for the 7^th & 8^th trees were the inferior while other four combinations of two other trees (2^nd & 6^th) were in between. The same trend was detected with the different growth measurements of the survived rooted cuttings of fire successed five genotypes with few exceptions scarcely observed during two seasons.