AGE-DEPENDENT VARIABILITY OF THE DYNAMICS OF LINEAR GROWTH OF SALIX TRIANDRA SHOOTS

Abstract

Salix triandra (almond willow) is an established crop, grown for basket-making materials. This species is also used for a wide range of environmental projects. The paper aimed to comparative analysis of the seasonal dynamics of linear growth of shoots in S. triandra clones on stools of different ages. The object of the study is a model inbred-clonal population of S. triandra. Our study analyzed the growing annual shoots on saplings from cuttings. To obtain the material, one- and two-year-old stools of four clones were used. The observations were carried out in the conditions of the vegetative period in the year 2021. The development of shoots occurred in conditions of extremely excessive atmospheric moisture at the beginning of the growing season. The study also assessed the impact of ruderal vegetation.
 As a result of our observations, it was found that the length of shoots on annual stools reached 210-220 cm, on biennial stools – 300-340 cm. The average daily increment of shoots on annual stools was 2.01±0.052 cm/day (with a maximum of 3.8-4.4 cm/day), on biennial stools – 2.88±0.069 cm/day (with a maximum of 5.0-6.1 cm/day). The root mean square amplitude of oscillation in the daily growth of shoots on annual stools was 0.79 cm/day, on biennial stools – 1.34 cm/day. The results showed that, regardless of the age of the stool, there is a cyclic development of shoots, which is due to the alternation of the maximum and minimum daily growth. The greatest degree of synchronization of maximum and minimum values of daily shoots increment in spring and early summer is revealed. A clone has been identified that gives consistently high increment of shoots. It is recommended to use such clones to create sustainable and multifunctional crops of almond willow.