Plant growth regulator effects on sunflower parents and F1 hybrids

Abstract

The need for augmented sunflower production requires finding new meth­ods and improving existing cultivation technologies to increase performance and resistance to stresses. The low performance of breeding and seed production lines is among obstacles to the rapid introduction of new and modern sunflower hybrids into production. The study purpose was to evaluate the individual responses of self-pollinating sunflower lines intended for breeding and seed production and of F1 hybrids, which were developed by crossing these lines, to plant growth regulators. It was found that the CMS-based lines had better yield elements and oil content in response to growth regulators compared to the lines based on normal cytoplasm. The plant growth regulators increased the heterosis effect in the experimental hybrids. The best response was observed in the threeline hybrid Skh808A/Kh1002B × Kh785V for all the studied parameters. The growth regulators strengthened a correlation between the 1000-seed weight and yield (r = 0.51–0.97). The oil content in seeds of F1 hybrids depended on the genotype and could be comparable both with the parent with a low content of oil and with the high-oil parent. Variations in the oil content in seeds depended on the type of growth regulator and soil/climatic conditions during the seed filling.

Екологічна Пластичність Та Стабільність Сортів Кондитерського Соняшнику В Умовах Східного Лісостепу України

“…Відповідно до результатів досліджень різних авторів, посіви соняшнику формують складну динамічну систему, пов'язану з ґрунтовими та кліматичними чинниками і передумовою для змін яких, є відмінності у тривалості різних фаз розвитку рослини [11,12].…”

Features of Forming Soil Regimes under Sunflower Cultivation with Different Levels of Biologization in Non-irrigated Conditions of the Southern Steppe of Ukraine

“…This trend is also clearly observed during the analysis of presentations of new products from plant protection companies, which increasingly include preparations of organic origin that not only serve purely pesticidal functions but also possess properties of immunomodulators, thermoprotectors, growth regulators, cytokinins, etc. (Chen et al, 2021;Chuiko 2021). Using modern biologically active substances of natural origin in production conditions makes it possible not only to increase the productivity per hectare of sunflower sowing but also to significantly influence the quality indicators of the harvest.…”