The study of breaking dormancy and evaluating the effect of planting substrates on the success of the reproduction of several desert and medicinal species resistant to drought and salinity

Introduction: The development of urban green space is one of the important requirements of today's life in big cities, in the meantime, due to the lack of water, plants that are resistant to salinity should be used, and at the same time, economical substrates should be used. In this study, several medicinal and pasture plants such as Ajowa, Atriplex, Sophora mollis, Evening Primrose and Vitex and clover and alfalfa species which are fodder plants have been compared. In this study, first, the best methods of breaking dormancy of the seeds were studied, and while choosing and introducing the best method of planting and establishing them, it was investigated in a completely random factorial design with three types of planting substrates. The results indicated that the planting substrate, one of which was a degradable pot, was completely different from the rest in the four-leaf and six-leaf stages. Among the seven investigated plant species, the plants' reactions in germination and establishment were completely different, and the amount of sprouts in alfalfa at all stages was more than the others, but according to the treatments applied to Atriplex canescens (use of boiling water for ۷ stages of ۵ seconds), Ajowa (soaking in lukewarm water) and S. mollis (prechill treatment for two weeks at temperature ۰-۵ °C and gibberellic acid ۵۰۰ ppm) had higher germination after alfalfa, and only Vitex, Dichondra clover and evening primrose had the lowest germination rate. Also, it was ranked first in terms of germination speed, and the growth rate of evening primrose, clover, and S. mollis seeds was higher than the others, and the growth rate of Atriplex, Vitex, and Ajowa were in the next ranks. Materials and methods: First, standard seeds were procured from Pakan Seed Isfahan co. and dormancy breaking treatments were applied to S. mollis and Atriplex seeds that had dormancy. In S. mollis plant, due to the presence of embryo dormancy, cold (۲ weeks) and cold (۴ weeks), ۵۰۰ ppm GA۳, ۱۰۰ ppm GA۳, Tiure treatment, KNO۳ were applied together with the control, and for Atriplex seeds, due to the presence of husk dormancy, dry scratching treatments (۵ minutes), boiling water (۷ stages of ۱۰ seconds), hot water (until the plant cools down to a temperature of ۷۰ ºC), ۵۰% distilled water, ۲۴-hour soaking with the control were applied. Then the plants were planted in the culture trays with three types of degradable pots substrate, cocopeat and peat moss substrate and cocopeat, peat moss and vermicompost treatment and the germination and establishment rate in two-leaf, four-leaf and six-leaf stages was evaluated with four repetitions. Then, the results of the amount (number) of establishment in different stages and the germination rate in them were evaluated by SAS and EXL tests, and variance analysis tables and treatment comparison tables were made. Results and Discussion: Variance analysis table number (۱) shows that in the germination stage of the desired plants, there is a significant difference in terms of the germination rate, but the planting substrate has no effect.

کلیدواژه ها:

Breaking dormancy ، planting substrates ، reproduction success ، desert species ، medicinal species ، drought resistance ، salinity resistance