Specificities of measured polyvariance the seeds of Cucurbita pepo var. Giramontia duch. Under climate changes in Pridnestrovie

Actuality.Industrial technologies of vegetable crops cultivation, including squash cultivation, a lot ofattention is paid to the uniformity of seeds by morphometric traits as a condition allowing to use the preci-sion technologies.The goal of the study is to determine specificities of measured polyvariance the seeds of Cucurbita pepovar. giramontia Duch. under changes of climate conditions in Transnistria.Materials and methods.The studies were carried out at the experimental plot of Pridnestrovian StateUniversity (Tiraspol) in 2005-2012. Objects of studies – 5 lines (166/5; 19/84; 98/5; 5Б; 48/20) ofsquash. Morphometric traits of seeds: mass, width, length, thickness were evaluated in the sample of 100seeds. Mass of the seed was evaluated with help of torsion scales with exactness to 0,001 g. Width,length, thickness were mesuared with microscope MBS-10 with exactness to 0,1 mm. squash plants weretreated with water solutions of the preperation Micefit in concentrations 10 and 100 mg/l in the phase of"2-3 true leaves" and "6-7 true leaves", standard is water treatment.Meteorological conditions (temperature, amount of precipitation) the year of seed reproduction werecharacterized by the data of Tiraspol Agrometeorological Station. Hydrothermal regime the growing ofsquash plants was characterized by the hydrothermal coefficient (CHT) of Selyaninov.Results.The nature of changes in temperature and precipitation over 7 years (2005-2012 periods) werereflected increased anomality of weather conditions in Transnistrian region. First of all, it concerns thequantity and the intensity of precipitation during the formation and maturation of squash seeds.Distribution decades of total precipitation and temperatures caused extremely uneven hydration: CHTvariation ratio was 29.2-61.3%. Almost all periods of study were stressful for plants and led to the dimen-sional polyvariance of squash seeds. The variation of morphometric traits (coefficient of variation) isdepended on changes in the hydrothermal regime of the growing season. It has a non-linear character andwas genotypically caused. Applying the preparation Micefit had a significant effect on the manifestation oftraits of squash seeds and its interaction with meteorological factors determined their modifying ability inthe following order: mass (78,2%)→length (56,6%)→thickness (43,7%)→width (40,4%).