Effects of Selenium-Methionine against Heat Stress in Ca 2+ -Cytosolic and Germination of Olive Pollen Performance

Alberto Marco Del Pino, Luca Regni, Alessandro Di Michele, Alessandra Gentile, Daniele Del Buono, Primo Proietti and Carlo Alberto Palmerini
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Alberto Marco Del Pino: Department of Agricultural, Food and Environmental Sciences (DSA3), University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy
Luca Regni: Department of Agricultural, Food and Environmental Sciences (DSA3), University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy
Alessandro Di Michele: Department of Physics and Geology, University of Perugia, Via Pascoli, 06123 Perugia, Italy
Alessandra Gentile: Department of Agriculture, Food and Environment, University of Catania, Piazza Università, 95131 Catania, Italy
Daniele Del Buono: Department of Agricultural, Food and Environmental Sciences (DSA3), University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy
Primo Proietti: Department of Agricultural, Food and Environmental Sciences (DSA3), University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy
Carlo Alberto Palmerini: Department of Agricultural, Food and Environmental Sciences (DSA3), University of Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy

Agriculture, 2022, vol. 12, issue 6, 1-11

Abstract: Climate change (CC), which causes temperatures to rise steadily, is causing global warming. Rising temperatures can reduce plant yield and affect pollen characteristics. In particular, heat stress strongly influences pollen viability for its sensitivity to this extreme environmental condition. This work evaluated the effect of heat stress on olive pollen after in vitro incubation at different temperatures (20, 30, and 40 °C). Furthermore, the potential of selenium-methionine (Se-met) in mitigating the detrimental effects of heat stress on olive pollen was investigated. In particular, how thermal stress can affect pollen was evaluated by testing the effect of temperature on pollen germinability and morphology and cytosolic Ca 2+ content. The results suggest that the heat stress at 40 °C caused a marked reduction in the germination rate, changes in the morphology of the external pollen wall, and a decreased response to Ca 2+ -agonist agents. On the contrary, in vitro treatment of pollen with Se-met improved the germination rate and Ca 2+ -cytosolic homeostasis under heat stress conditions and confirmed the protective role of this compound in containing the hydrogen peroxide (H 2 O 2 ) toxicity. Therefore, this study revealed that organic selenium could play a crucial role in promoting heat tolerance in olive tree pollen.

Keywords: Olea europaea L.; selenium; heat stress; Ca 2+ -cytosolic; pollen germination (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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