ISSN 1392-3196 / e-ISSN 2335-8947
Zemdirbyste-Agriculture, vol. 106, No. 2 (2019), p. 129–134
DOI  10.13080/z-a.2019.106.017

Improving potato microclone productivity by exogenous application of proline, glutamic acid and stem decapitation



Various growth regulators are used for plant stress reduction. They help to maintain the osmotic pressure required in cells and protect against increased saline concentration in the nutrition medium. The purpose of the experiment was to determine the influence of bioactive products produced from amino acids: proline amino acid (PAA) Prolis, and glutamic amino acid and potassium sulphate (GAA-K2SO4) Pompa, and stem decapitation on the formation of potato (Solanum tuberosum L.) minitubers of early cultivar ‘Goda’ and very late cultivar ‘VB Aista’ with different durat ion of plant ontogenesis. Amino acid products were used once (after potato microclone transplanting to the substrate) or twice (after microclone transplanting to the substrate and after 30 days) during the growing season. Stem decapitation was performed at growth stages BBCH 51 and 57. The influence of PAA and GAA-K2SO4 on the productivity of microclones was found to depend on the potato genotype. The minituber weight of potato late cultivar ‘VB Aista’ increased significantly (P < 0.05) after treating plants with GAA-K2SO4 once or twice during the growing season. Stem decapitation at stage BBCH 57 significantly increased the minituber weight of both cultivars and the number of minitubers of ‘VB Aista’. A strong positive correlation was established between the minituber weight and nitrogen concentration in the potato leaves at the flowering stage.

Key words: bioactive product, glutamine, minituber, osmoprotectant, proline.

Full text: 106_2_str17.pdf