Factors playing role in heat acclimation processes in barley and oat plants

Abstract

In the present study, the heat acclimation processes (growing at 30/27°C for 2 weeks) in spring and winter varieties of barley (Hordeum vulgare L., varieties 'Conchita' and 'Mv Initium') and oat (Avena sativa L., varieties 'Mv Pehely' and 'Mv Hópehely') were characterized. Temperature dependence of certain chlorophyll a fluorescence induction parameters indicated the efficiency of heat acclimation. Heat treatment induced the activity of glutathinone-S-transferase, but decreased the amounts of the major polyamines. A significant increase in cadaverine content was found in 'Conchita'. 1,3-diaminopropane contents after heat acclimation were lower in the oat and higher in the barley varieties than that in the control plants. Salicylic acid and para-hydroxybenzoic acid contents were also induced at elevated temperatures. Changes in abscisic acid differed in the two species. Results suggest that besides certain similarities, different strategies can be activated to avoid the damaging effects of high temperatures in barley and oat plants.

Acclimation of photosynthetic processes and metabolic responses to elevated temperatures in cereals

“…In the next part of the experiments two selected barley (the winter type Mv Initium and the spring type Conchita) and two oat varieties (winter type Mv Hópehely and spring type Mv Pehely), which have been investigated in one of our earlier studies (Darkó et al 2019), were further investigated. A non‐targeted metabolomic analysis focusing on polar metabolite identification and quantitation revealed substantial differences between these species and the primed and non‐primed plants.…”

“…However, direct relationship between heat tolerance of the varieties and the changes in the critical temperature values could not be detected in wheat plants. In another study, where different barley and oat genotypes were compared, results suggested that the temperature dependence could differ in spring and winter varieties of these species (Darkó et al 2019). However, since that result was only obtained using 1–1 spring and winter genotypes in both species, a confirmation was necessary in order to generalise the differences between the spring and winter varieties.…”

“…Golden Promise, Jubilant and Conchita spring and cv. MvHV0517, Mv Initium and Meridian winter varieties), wheat ( Triticum aestivum L. Chinese Spring, IKVA and Mv Nádor winter varieties) and oat ( Avena sativa L. Mv Szellő and Mv Pehely spring, and Mv Hópehely and Mv Kincsem winter varieties) were grown and treated as described earlier (Darkó et al 2019). Seeds were sown in plastic pots 3:1 (v:v) mixture of loamy soil and sand.…”

“…In wheat plants, fluorescence induction parameters, in contrast to CO 2 assimilation parameters and chlorophyll content values, showed less genotype dependence, and they were more indicative of a general acclimatisation processes (Végh et al 2018). However, when the temperature dependence of the fluorescence induction parameters has been investigated in different oat and barley genotypes, species and variety dependent differences could also be detected (Darkó et al 2019).…”

“…However, little is still known about the heat acclimation‐induced changes at the metabolic level, especially in monocot crop plants. In the present work the following hypotheses were tested: (1) Earlier results using two spring and two winter oat and barley genotypes showed differences between winter and spring types in these species (Darkó et al 2019). Here, we used a large number of genotypes to test whether the spring–winter type could indeed be differentiated with evaluation of the temperature curves of certain chlorophyll a fluorescence parameters; (2) In order to find species and/or winter–spring type differences, we also tested the responses of gas exchange parameters to heat acclimation; (3) In addition, in selected genotypes metabolic profiles, completed with gene expression studies, were investigated in non‐acclimated and acclimated plants to get further information about the heat acclimation processes.…”