Fiziol. rast. genet. 2019, vol. 51, no. 4, 324-337, doi:

Effect of exogenous abscisic acid on morphological characteristics of winter wheat and spelt under hyperthermia

Kosakivska I.V., Vasyuk V.A., Voytenko L.V.

  • M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine 2 Tereshchenkivska St., Kyiv, 01601, Ukraine

The effect of short-term heat stress (+40 oC, 2 h) on the growth characteristics of 3- and 14-day-old Triticum aestivum L. and Triticum spelta L. plants, the grains of which have been primed with solutions of abscisic acid (ABA), was investigated in laboratory conditions. At the beginning of development, the inhibitory effect of high temperature on the growth of 3-day-old seedlings of winter wheat cv. Podolyanka, primed with 10—7 M solution of ABA, was less pronounced than in non-primed plants. On the sixth day, when passing from heterotrophic to autotrophic feeding, the highest growth indices were recorded in plants primed with 10—6 M ABA. The length of the roots and shoots of 3-day spelt cv. Frankenkorn primed with 10–7 M ABA after hyperthermia increased by 8 and 2 %, respectively. On the sixth day, the morphological characteristics of shoots and roots of primed plants exceeded the control. In 14-day-old winter wheat plants, which were primed with ABA, after short-term hyperthermia, an increase in the length and mass of the roots was recorded by 9 and 19 %, respectively. Dry shoots mass after heat stress remained almost unchanged, and in the roots it decreased significantly. During the recovery period on 21 day, the dry mass of the control plants decreased by 14 %, and that of the primed plants by 9 %. The ABA priming induced root growth during recovery. After hyperthermia, the mass of shoots and roots of 14-day old primed spelt plants increased by 4 %, while that of non-primed ones decreased by 10 and 5 %, respectively. After recovery, the reduction in the length and mass of roots of unprimed plants was 19 and 12 %, respectively whereas in primed plants, the root length decreased by 13 %, fresh mass by 19, and dry mass by 18 %. The results showed that priming with ABA increased resistance to high temperature of 3- and 14-day plants of winter wheat and spelt. T. spelta was more stress resistant and recovered better. The possibility of exogenous ABA using to increase the stress resistance of cereals is discussed.

Keywords: Triticum aestivum, Triticum spelta, abscisic acid, temperature stress, morphometry, resistance

Fiziol. rast. genet.
2019, vol. 51, no. 4, 324-337

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