Ontogenetic Changes of the Pigment Composition of Leaves in Cyan Oil Flax Variety in the Steppe Zone Of Ukraine

Abstract

In recent years, oil flax has been very popular in Ukraine. Different spheres of the use of culture indicate good adaptive opportunities for growing oil flax in different regions of Ukraine. The aim of this work is to study the content and ratio of the main photosynthetic pigments of the flax variety of oilseed Cyan grown in ontogenesis. Plants were grown in natural open ground. The number of pigments was determined by spectrophotometric method. This is research data on the content of the main photosynthetic pigments in flax of Tsian. The content of chlorophyll a, b and carotenoids was studied at three stages of development: at the stage of 8-10 leaves, budding, flowering. It was established that the amount of chlorophyll a exceeds the content of chlorophyll b at all stages of development. An increase in the pigment content during ontogenesis to the flowering stage was revealed, with the exception of chlorophyll b. At the stage of the at the stage of 8-10 leaves in the Tsian variety, the amount of chlorophyll a ranged from min 754.74 ± 63.768 μg/g, max 1582.82 ± 126.973 μg/g wet weight, the amount of chlorophyll b ranging from min 203.23 ± 17.549 to max 602.24 ± 46.577 μg g wet weight, and carotenoids from min 220.99 ± 18.388 to max 409.94 ± 37.572 μg/g fresh weight, depending on the year of study. In the budding phase, the minimum content of chlorophyll a was min 1444.87 ± 105.771, and the maximum max 2027.34 ± 174.258 μg/g wet weight, chlorophyll b: from min 553.23 ± 48.345 to max 1733.69 ± 109.675 μg/g raw weight, and carotenoids: from min 354.81 ± 26.759 to max 402.63 ± 26.765 μg/g wet weight, depending on the year of study. In the flowering phase, the following indicators were observed: chlorophyll a content from min 1804.43 ± 164.425 to max 2370.56 ± 207.589 μg/g wet weight, chlorophyll b from min 1055.24 ± 89.562 μg/g wet weight to max 1649.21 ± 107.258 μg/g, and carotenoids from min 472.19 ± 36.141 μg/g to max 519.3322 ± 39.911 μg/g, depending on the year of study. The ratio of the number of chlorophylls and the sum of chlorophylls to carotenoids varies depending on the stage of development of the variety and growing conditions.