Influence of inbreeding on the morphobiological characteristics of meadow clover (Trifolium pratense L.)

The influence of inbreeding on the morphobiological characteristics of meadow clover was revealed. Self-pollination, repeated in the number of successive generations, leads to an increase in homozygosity and to inbred depression, which increases from I 1 to I 3 generation and stabilizes in the I 4 generation. It was found that in the I 1 generation, according to the main morphobiological characteristics, there is no inward depression, but the maximum release of recessive lethal mutations is manifested, which amounted to 6.2%, and the survival rate of seedlings decreases (91.7%). By the I 4 generation, the number of chlorophyll-free seedlings decreases to 1.4%. All the main morpho-biological indicators that determine the productivity of plants decrease from generation I 1 to generation I 3 by 1.5-2 times and stabilize in generation I 4 . Obtaining hybrid F 1 offspring by crossing a linear material with an I 4 induction level leads to the restoration of plant productivity indicators. When creating a linear material, an increase in the number of highly self-compatible genotypes from I 1 to I 4 generation by 60% is clearly traced. The data obtained make it possible to take into account the survival rate of seedlings, the cleavage of lethal and semi-lethal mutations, the degree of inbred depression in the formation of sample volumes when creating a linear material of meadow clover.