Fiziol. rast. genet. 2021, vol. 53, no. 1, 63-73, doi: https://doi.org/10.15407/frg2021.01.063

Effect of tebuconazole on the use of reserve substances deposited in the seed of Vicia faba L. at the hete-rotrophic phase of development under conditions of photo- and scotomorphogenesis

Kuryata V.G., Kuts B.A., Poprotska I.V.

  • Mykhailo Kotsyubynsky Vinnytsia State Pedagogical University 32 Ostrozhskoho St., Vinnytsia, 21001, Ukraine

The combination of external (light/dark) factor and the action of the gibberellin synthesis inhibitor tebuconazole during seed germination significantly changed the pattern of source-sink relationships in horse beans seedlings. Under the action of the tebuconazole the epicotyl, root, and seedling length in general were reduced significantly, both at light and dark. Similarly, the dry matter mass of the seedling organs was decreased. Seed reserve substances were used more intensively under conditions of scotomorphogenesis, as evidenced by the minimum cotyledons dry matter mass in this variant and higher utilization rates of reserve substances for root and epicotyl formation during germination. The retardant application led to a slowdown in the outflow of seed reserves for the formation of epicotyl and root. Under conditions of scotomorphogenesis, the rate of reserve seed starch use was higher. The gibberellin biosynthesis inhibitor tebuconazole did not affect the rate of cotyledon starch hydrolysis, indicating an internal sufficient supply by reserved forms of gibberellins. The higher sugar content in the cotyledons of scotomorphic plants, both in the control and under the action of tebuconazole, is explained by the slowing of the outflow for the needs of organogenesis — the formation of root and epicotyl structures. Quantitative changes of the nitrogen content in the cotyledons of scotomorphic and photormorphic plants during germination were much smaller than the changes of the starch content. It was no significant effect of tebuconazole on the remobilization of nitrogen-containing compounds and mineral nutrients — phosphorus and potassium deposited in the seed, on the needs of organogenesis.

Keywords: Vicia faba L., morphogenesis, source-sink system, seed germination, light, retardants

Fiziol. rast. genet.
2021, vol. 53, no. 1, 63-73

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