Növénytermelés / Volume 68 / Issue 1 (March 2019) / pp. 13-30

FÁBIÁN ATTILA – SÁFRÁN ESZTER – SZABÓ-EITEL GABRIELLA – BARNABÁS BEÁTA – JÄGER KATALIN

Effect of heat and drought stress on the reactive oxygen species content of stigma papilla cells, the lipid peroxidation and fertility in wheat

Combined heat and drought stress around flowering have a deletorious effect on the yield of winter wheat. Although decrease in fertility after heat and drought stress is generally accounted on pollen dysfunction, the damage suffered by the stigma is another potential factor. Our results confirmed that heat and drought stress applied before anthesis induced the damage of stigma papilla cells, which contributed to the yield decrease. Hypothetical connection between the amount of reactive oxygen species, as well as lipid peroxidation in stigma papilla cells, and fertility was investigated using two genotypes possessing different heat and drought tolerance. General oxidative stress, nitrogen monoxide content and lipid peroxidation were monitored using fluorescent indicators. The level of oxidative stress and lipid peroxidation were elevated to a significantly higher extent in the stigma papilla cells of susceptible ‘Cappelle Desprez’ compared to the tolerant ‘Plainsman V’ genotype. On the contrary, amount of nitrogen monoxide decreased in ‘Cappelle Desprez’ parallel with fertility following the treatment, indicating the important role of this compound in fertilization.

Keywords: high temperature, drought stress, winter wheat, oxidative stress, fertility, stigma

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