Inheritance of the corolla length and diameter in tubular florets of sunflower

Some morphological features of tubular sunflower florets affect the process of bee pollination during flowering, which makes them significant for breeding for high seed productivity. These include the length of the corolla, which determines the availability of nectar and the diameter of the corolla circle, potentially affecting the amount of nectar. In 2017-2019 the variability and inheritance of these traits in the lines from the genetic collection of VNIIMK, Krasnodar were studied. The corolla length was measured from the base to the end of the cloves. The genetic collection of sunflower contains lines with hereditarily controlled differences in corolla length from 6.3 to 9.2 mm and circle diameter from 1.4 to 3.6 mm. Variation in the length of the corolla is estimated to be low (CV = 9%) with a share of the influence of the genotype factor 96%, and the diameter of the circle - as moderate (CV = 13%) with a share of the influence of the genotype 94%. We established no reliable correlation between the length and the diameter of the corolla in the lines from the genetic collection (r = 0...