Study On The Cutting Propagation Techniques And Rooting Mechanism Of Elaeagnus Mollis

With the increase of population, the increasing rarity of plantation resources and the improvement of living standards, the development of woody oil has already become one of the main approaches to meet the needs of edible oil in many countries. As for China, a developing country with a large amount of population, there are many great realistic significances in developing and utilizing woody oil plants not only for meeting its increasing needs of edible oil but for its adjustment of agricultural industry and product structure.Elaeagnus mollis Diels, belonging to Elaeagnus, Elaeagnaceae, is a rare woody oil tree species, which has already become the most important economic tree in mountainous regions of Shanxi province in view of its multiple uses in foodstuff, health and medicine, and so on. The shortage of good seedlings was an obstacle to accelerate the plantation of Elaeagnus mollis Diels. during its exploitation. In order to meet the needs of nursery stock and provide the technological basis for effective cultivation and utilization of Elaeagnus mollis Diels., we studied the cutting propagation techniques and the rooting mechanism of green-wood cutting in physiology. The following results were documented:(1) The effects of different treatments on hard-wood rooting were studied by orthogonal experiment. The results showed: the combination of A₂B₂C₃D₃E₄ was optimized for hard-wood cuttings. In another word, the cuttings were optimal in upper crown with a length of 15 cm, treated by IBA in concentration of 500 mg/L for 20 minutes and then cut into medium of vermiculite. It was difficult to root for hard-wood cuttings at the maximal rooting rate of 39.33%. In addition, rooting of hard-wood cuttings has a close relation to callus as callus rooting type. From the hard-wood cutting experiments, which used one-year-old stump shoots from six-year-old mother trees as materials, on different time and different branches, we made the following conclusions: it was preferential to choose upper crown as hard-wood cuttings in production, and the proper cutting time was early or mid March and could not be too late.(2) The effects of different treatments on green-wood rooting were studied by completely random designs. The results showed: it was the best to select middle crown of new shoots from 2-year-old mother trees as materials, treated by IBA in concentration of 500 mg/L for 1 minute with a rooting rate of 82%. The 6-year-old mother trees were select- ed as materials in other experiments, of which the two highest rooting rate reached at 64% and 62%, the combinations were: the cuttings were treated by IBA in concentration of 3000 mg/L mixed with muddles for 1 minute and the cuttings were treated by IBA in concentration of 100 mg/L for 4h, respectively. The cutting media of the experiments mentioned above were the compound media of vermiculite and peat at a ratio of 1:1 in volume. In addition, from the experiments on the size of cuttings, the time of cutting and the cutting media, we could make a conclusion that: under the same other conditions, the best level of three factors were cuttings with a length of 9～13 cm and a diameter of 0.3～0.5 cm, cut on mid of June and the compound media of vermiculite and peat at a ratio of 1:1 in volume, respectively.(3) The study on physiology of green-wood cutting showed: The contents of IAA, Z and ratio of IAA/ABA in green-wood cuttings are positively correlated with rooting rate, the content of ABA is negatively correlated with rooting rate. The relation between GA₃ or the ratio of Z/IAA and rooting rate is not certain. The relation between content of phenol in cuttings before cutting and rooting rate is not certain. During the whole rooting period, the content of phenol in green-wood cuttings is negatively correlated with rooting rate. The content of nutritious substance and ratio of C/N in cuttings before cutting are not critical to rooting rate. The nutritious substance content and ratio of C/N in green cuttings were positively correlated with rooting rate during the whole rooting period.