Influence of hydrothermic factors on phenotypic composition of cucumber variety population Naslednik. G.A. KUZMITSKAYA, G.E. SHESTOPALOVA

Abstract

Influence of hydrothermic factors on phenotypic composition of cucumber variety population Naslednik. G.A. KUZMITSKAYA, G.E. SHESTOPALOVA (Far East Research Institute of Agriculture, Khabarovsk).

The study of a new variety population of cucumber Naslednik by the main testing attributes of the seed fruit, the determination of the main and associated biotypes of its components, as well as the influence of specific environmental and climatic factors on its phenotypic composition of this variety population was the purpose of our research for 2016–2018. It was found that this variety population was heterogeneous and consisted of biotypes that differ in length and shape of biologically ripe fruits. The conducted research allowed identifying 4 forms (biotypes) of seed fruits: ovoid – the main biotype, which constituted in various years 55.3–71.3 % of the total population, cylindrical, elongated–ovoid and elongated–cylindrical – related biotypes, which on average accounted for 28.5; 1.6 and 5.7 % respectively. The length of the seed fruits varied within 10–22 cm. The 7 biotypes were revealed on this basis: 10–12 cm, 13–14, 15–16, 17–18, 19–20, 21–22 and > 22 cm. The length of the fruit was less stable than the shape of the fruit, and was directly dependent on the sum of active temperatures and number of fallen precipitation during the growing period.