Fiziol. rast. genet. 2016, vol. 48, no. 1, 56-64, doi:

Effect of hyperthermia on cytokinin and pigments content of Glycine max (L.) Merr. varieties differed in thermotolerance

Kosakivska I.B., Yarotska K.M., Voytenko L.V., Babenko L.M.

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

The effect of hyperthermia on the quantitative and qualitative composition of cytokinins (CK) in roots and leaves of two Glycine max (L.) Merr. cultivars differed in thermotolerance, which were inoculated with active nitrogen-fixing bacteria Bradyrhizobium japonicum 634b was investigated. It was shown that a short-term heat stress (2 h, +40 °C) at the «alarm» phase caused nonspecific responses, among which there were decrease of CK in roots, increase of trans-zeatin (trans-Z) and izopenteniladenozin (iPA) content in the shoots of 35-day-old soybean plants. At the same time there were found some specific changes in CK content and spectrum, which depended on cultivar, plant organ and presence of nodules with nitrogen-fixing microorganisms. It was shown that the absence of nodules had a negative effect on the content and spectrum of CK in soybean plant. The increase of iP-type CK content and chlorophyll b and chlorophyll a+b level in shoots after hyperthermia is a characteristic feature of the drought-resistant soybean cultivar KyVin.

Keywords: Glycine max (L.) Merr., cytokinins, pigments, hyperthermia

Fiziol. rast. genet.
2016, vol. 48, no. 1, 56-64

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