الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 137 |  |  |
| | | from | 137 | | |
Abstract
This experiment were conducted during 2008 and 2009 seasons to study the effect of 3 growth and root-induced regulators, Indole butyric acid (IBA) solution at 4000 ppm, hydrogen peroxide (H2O2) solution at 3.5% and Vitamin B12 solution at 24mg/L along with wounding process at the basal cuttings portion. They were used either solely or in interactions on stem hardwood cuttings of guava trees (Psidium guajava L.).The source of cuttings was selected from fruiting guava trees at15-year-old grown in a private orchard located at Om EL-Reda district, Damietta governorate, Egypt. The selected trees were apparently disease and pests free and known of fruits yield in good quantity and quality. The basal portion of wounded and non wounded cuttings just before are inserted in the planting medium (Sand and Peatmoss 1:1 v/v) dipped in the tested solutions for 30 second each. After treatment the cuttings were planted in polyethylene black bags 12 cuttings each. The planted bags were placed on the soil surface in greenhouse at a private nursery equipped with mist irrigation unit and located at Om EL-Reda district, Damietta governorate, Egypt. Data obtained in this study could be summarized as follows: 1- Buds burst % at 8-week-old and buds survival % at 12-week-old from planting date All tested treatments had an obvious effect in both seasons of the study, especially in wounded hardwood cuttings ”T12” gave the best results on buds burst % and buds survival % during the two seasons of the study (81.52% and 62.83%, respectively) Otherwise, minimum bud burst % at 8-week-old was resulted in cuttings of ”T13” with an average of 62.98%. The corresponding minimum bud survival % was in wounded cuttings of the same treatment with an average of 30.42%. As for non-wounded cuttings maximum buds burst % was in cuttings of ”T3” (72.65%) and for buds survival % was in cuttings of ”T5” (53.04%). minimum buds burst and buds survival percentages were in cuttings of ”T7” with the percentages of 52.00 and 28.75%, respectively. 2- number of shoots and leaves per cutting at 1.5-month-old from planting date The results showed that T12 gave significant increase in wounded cuttings (3.43 shoots and 5.75 leaves per cutting), while the minimum values were in wounded cuttings of ”T13” treatment with an average of 1.55 shoots and 2.22 leaves at 1.5-month-old. On the other hand, ”T5” gave the best results (2.54 shoots and 4.89 leaves per cutting) in non-wounded cuttings; minimum values were in cuttings of ”T7” treatment with average values of (1.68 shoots and 2.68 leaves per cutting). 3- root characteristics The study showed that growth and root promoters, H2O2, IBA and their interaction with wounding process ”T12” had the most significant effect on most of root characteristics measured it gave the highest rooting % (an average of 70.67%), primary roots number per cutting (an average of 24.96 roots) and primary root length per cutting (an average of 8.37cm) as well as the next higher values of secondary roots number per cutting (an average of 8.58 roots). The corresponding maximum values in case of non-wounded cuttings were in those of ”T5” treatment with an average rooting percentage of 43.00% and primary roots number of 16.65 roots as well as relatively a higher primary roots length (an average of 5.77cm) and secondary roots number (an average of 4.70 roots) per cutting at 3-month-old. On the other hand, minimum root characteristic values in case of wounded cuttings were in cuttings of ”T11” with average values of 5.58% rooting percentage, 3.50 primary roots number, 3.70 cm primary root length and complete failing to induce secondary roots. The corresponding minimum values with non-wounded cuttings were in cuttings of ”T7” treatment with an average of rooting percentage (6.05%), primary roots number (3.67 roots) and secondary roots number (00.00). 4- chemical parameters The part of the present study concerning with chemical composition of nitrogen and carbohydrate contents, C/N ratio and phenols content in basal portion of the treated non-wounded and wounded cuttings clearly indicated that cuttings having an appropriate level of nitrogen contents, high level of carbohydrates, high C/N ratio and low level of phenols are the best to increase rooting percentage and induce adventitious roots of good characteristics ” T12”, ” T5” while, the poor root characteristics was resulted in the treatments of ” T7”, ” T11”.