Involvement of homocastasterone, salicylic and abscisic acids in the regulation of drought and freezing tolerance in doubled haploid lines of winter barley

0522674 - ÚEB 2020 RIV NL eng J - Journal Article
Malaga, S. - Janeczko, A. - Janowiak, F. - Waligórski, P. - Oklešťková, Jana - Dubas, E. - Krzewska, M. - Nowicka, Anna - Surówka, E. - Rapacz, M. - Wójcik-Jagła, M. - Kopeć, P. - Hura, T. - Ostrowska, A. - Kaczanowska, K. - Żur, I.
Involvement of homocastasterone, salicylic and abscisic acids in the regulation of drought and freezing tolerance in doubled haploid lines of winter barley.
Plant Growth Regulation. Roč. 90, č. 1 (2020), s. 173-188. ISSN 0167-6903. E-ISSN 1573-5087
R&D Projects: GA MŠMT(CZ) EF16_019/0000827
Institutional support: RVO:61389030
Keywords : Environmental stress acclimation * Homozygous lines * Hordeum vulgare (L.) * Phytohormones
OECD category: Biochemistry and molecular biology
Impact factor: 3.412, year: 2020
Method of publishing: Open access
https://link.springer.com/article/10.1007%2Fs10725-019-00544-9

Ten doubled haploid (DH) lines of winter barley with an increased range of freezing/drought tolerance were used to identify phytohormones involved in plant stress acclimation. Cold hardening and drought stress were applied at the most critical stages of plant development on young seedlings and heading plants, respectively. The level of the phytohormones was significantly higher at heading, more than 5-fold in respect of salicylic acid (SA) and total brassinosteroids (BRs) and 1.7-fold in the case of abscisic acid (ABA). Moreover, the spectrum of detectable BRs increased from one—homocastasterone (HCS)—found in seedlings to four BRs identified in heading plants [HCS, castasterone (CS), teasterone and dolicholide], with the last one detected for the first time in cereal species. To some extent freezing tolerance seems to be determined by native hormonal status as control seedlings of tolerant DH lines contained 1.4- and 2.3-fold lower amount of ABA and HCS and 2.3-fold higher amount of SA in comparison to freezing-sensitive ones. Such dependency was not observed in heading plants as significant variation in CS content was the only detected difference. Under stress treatments, tolerant DH lines accumulated significantly lower (75–81%) amount of ABA, which probably reflected lower stress intensity resulting from another defence strategy. In contrast, stress-induced significant almost 2-fold increase in HCS/CS and 2–3-fold decrease in SA content specific for tolerant DH lines of barley suggest the involvement of these molecules in freezing/drought defence. Detected correlations suggest their interaction with nonspecific peroxidase and low molecular weight antioxidants.
Permanent Link: http://hdl.handle.net/11104/0307124