The article substantiates the necessity to study the economic and biological features of promising clonal stocks, suitable for use in intensive technologies for cultivating stone fruit crops in order to identify their adaptive capacity in agroecological conditions of the Chechen Republic. The work was carried out in a greenhouse complex with fogging installations of the NPF "Gardens of Chechnya" in accordance with the work program and research methods in horticulture. Cuttings were treated before planting with indole butyric acid (IBA) and 50% aqueous solution of ethanol according to F.Ya. Polikarpova and V.V. Pilyugina (1991) the method. To obtain high-quality rootstock material from grassy cuttings with a semi-lignified heel a modified substrate in container culture was used consisting of equal volumes of peat, river sand, turfy ground (this soil mixture is sufficiently porous and prevents over-wetting of the root placement zone), and auxinic preparation IMC increasing root production ability of plants. As a control, a 50% ethanol aqueous solution was used. The reference area is 9 m2, the replication of the experience is quadruple, the location of the experiment is randomized. The region of plant alimentation is 6 x 6 cm. Experimental data on the effect of the auxin yield of IMK and 50% of the aqueous solution of ethanol (K) on the duration of rooting, the dynamics of the rhizogenerated activity, the main phytometric and phytophysiological parameters of different forms of clonal rootstocks. The growth activity of clonal rootstocks is analyzed on the basis of the studied dimensional parameters of rooted grassy cuttings.
The article presents the results of some experimental studies aimed at identifying the duration of the juvenile period that the aboriginal Chechen shapes of a willow-leaf pear have (PyrussalicifoliaPall.) under the acceleration of a breeding process, the goal of which is to achieve plants’ high early-maturity properties. The studies were carried out at Scientific Center “Gardens of Chechnya” within 2016–2019 in accordance with the Agreement on creative cooperation between All Russian Scientific Institute on Horticultural Crops Breeding and Scientific Center “Gardens of Chechnya”. The experiments were carried out in line with the Program for Breeding of Horticultural Crops, Berry and Walnut Fruits (1995) and the Program for Varieties-Study of Horticultural Crops, Berry and Walnut Fruits (1999). As a study object we used seeds of bred dwarf and weak-growing local Chechen shapes of the willow-leaf pear, generating fruit buds on one-year plants, and seeds of the Caucasian pear (PyruscaucasicaFed.) – 20500 pieces were taken of each shape. In April 2017, stratified seeds were sown in the sowing department of the Nursery Garden under the control of Gardens of Chechnya. Seedlings were grown according to generally accepted technology in rainfed conditions in a field with chestnut soil. Plants’ blossoming was observed in the spring of 2019. As an experiment result, based on a large amount of samplings, it was found that in rising plants among a great number of shapes of the aboriginal Chechen willow-leaf pear, the seedlings’ breeding is possible in the amount of a little more than 2 %, which have a very short juvenile period (2 years). The phenomenon is becoming an issue to study practically and scientifically with the aim to accelerate the breeding process and breed new varieties of pears with high early-maturity property. For further use and as source of a short juvenile period, 20 shapes of the willow-leaf pear were selected.
The results of the study of the duration of the juvenile period of indigenous Chechen willow leaf pear genotypes (Pyrus salicifolia Pall.) are given in connection with the acceleration of the breeding process and the use of selected forms in pear breeding for high precocity. The studies were carried out in 2016-2019 at OOO “Orchards of Chechnya” in accordance with the Agreement on creative cooperation with the Russian Research Institute of Fruit Crop Breeding. The work was carried out in accordance with generally accepted programs and methods. The objects of the study were one-year and two-year-old pear seedlings obtained from sowing seeds of selected dwarf and low-growing local Chechen forms of willow pear (P. salicifolia Pall.), laying fruit buds on annual growths and seedlings of Caucasian pear (P. caucasica Fed.), 20 500 pcs. of each specie. The aim of the research was to study the potential of precocity of willow pear seedlings and to reveal of selected forms with the greatest degree of this trait. Stratified seeds were sown in the sowing department of the OOO “Orchards of Chechnya” production nursery in April, 2017. The seedlings were grown according to the common technology in dryland conditions on the plot with chestnut soil. The first fl owering of plants was noted in the spring, 2019. As a result of the research, for the first time on a large number of the experimental material it was found that in the off spring of the indigenous Chechen willow leaf pear genotypes, the selection of a little more than 2% of seedlings with a very short juvenile period (2 years) was possible. They are of great interest in accelerating the breeding process and in the selection of new pear varieties with high precocity. 20 willow leaf pear genotypes were selected for the further use in breeding for high precocity and as sources of the trait of short juvenile period.
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