Effect of the physiological analogues of auxin – original compounds TA-12 (calcium 4-(2-chloro-ethoxycarbonylmethyl)-1-naphthalenesulfonate) and TA-14 (-trialkylammonioalkyl ester of 1-napthylethanoic acid) – on oilseed rape (Brassica napus L.) ‘Casino’ autumn growth peculiarities, cold acclimation-preparation for wintering and reproductivity organs formation was studied. Plants were treated with water solutions of the compounds TA-12 (2 mM identic 417 g ha-1) and TA-14 (4 mM identic 369 g ha-1) at the stage of 4–5 unfolded leaves. The results of field experiments showed positive effect of the compounds TA-12 and TA-14 on oilseed rape cold acclimation and preparation for wintering: they influenced formation of leaf rosette, intensified monosaccharide accumulation in root collum, conversion of the rape cone vegetative phase into a generative one and improved winterhardness of this culture. In spring the number of perished plants in test variants was lower by 11–15 % than in the control. The monitoring of reproductive organs formation showed that under the effect of TA-12 and TA-14, flowering and siliquae formation started 3–4 days earlier. Thus, the physiological analogues of auxin uncovered a possibility to improve preparation of plants for wintering, accelerate and partly unify duration of oilseed rape flowering, siliquae and seeds formation, which determines simultaneous seed maturity as well as formation of more plentiful yield.
Keywords: auxin physiological analogues TA-12, TA-14, oilseed rape, reproductive organs.