Molecular background of cadmium tolerance in Rht dwarf wheat mutant is related to a metabolic shift from proline and polyamine to phytochelatin synthesis

0532423 - ÚEB 2021 RIV DE eng J - Journal Article
Szalai, G. - Tajti, J. - Hamow, K. Á. - Ildikó, D. - Khalil, R. - Vaňková, Radomíra - Dobrev, Petre - Misheva, S. P. - Janda, T. - Pál, M.
Molecular background of cadmium tolerance in Rht dwarf wheat mutant is related to a metabolic shift from proline and polyamine to phytochelatin synthesis.
Environmental Science and Pollution Research. Roč. 27, č. 19 (2020), s. 23664-23676. ISSN 0944-1344. E-ISSN 1614-7499
Institutional support: RVO:61389030
Keywords : aba * pa * PCs * Proline * Rht * sa
OECD category: Biochemistry and molecular biology
Impact factor: 4.223, year: 2020
Method of publishing: Open access
http://doi.org/10.1007/s11356-020-08661-z

Plant height is among the most important agronomic traits influencing crop yield. Wheat lines carrying Rht genes are important in plant breeding due to their both higher yield capacity and better tolerance to certain environmental stresses. However, the effects of dwarf-inducing genes on stress acclimation mechanisms are still poorly understood. Under the present conditions, cadmium stress induced different stress responses and defence mechanisms in the wild-type and dwarf mutant, and the mutant with the Rht-B1c allele exhibited higher tolerance. In the wild type after cadmium treatment, the abscisic acid synthesis increased in the leaves, which in turn might have induced the polyamine and proline metabolisms in the roots. However, in the mutant line, the slight increment in the leaf abscisic acid content accompanied by relatively high salicylic acid accumulation was not sufficient to induce such a great accumulation of proline and putrescine. Although changes in proline and polyamines, especially putrescine, showed similar patterns, the accumulation of these compounds was antagonistically related to the phytochelatin synthesis in the roots of the wild type after cadmium stress. In the dwarf genotype, a favourable metabolic shift from the synthesis of polyamine and proline to that of phytochelatin was responsible for the higher cadmium tolerance observed.
Permanent Link: http://hdl.handle.net/11104/0310919