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Methyl jasmonate induces leaf senescence of Ginkgo biloba L.: relevance to endogenous levels of plant hormones

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Abstract

Methyl jasmonate (JA-Me) applied to the abaxial side of the middle of leaf blade on the beginning of September extremely induced leaf senescence in Ginkgo biloba; three weeks after the treatment the leaves disappeared chlorophylls and became yellow, while the control leaves remained still green. Contrarily JA-Me applied to the adaxial side of leaves affected little to induce senescence. When JA-Me was treated on the abaxial side of a half of leaf blade across to the vein, the yellowing widely took place both in acropetal and basipetal directions along vein, but no yellowing was visible in the non-treated half. On the other hand, when JA-Me was applied to the abaxial side of a half of leaf blade along to the vein, yellowing was observed only in both sides of a small area along to the applied area, and little yellowing was visible in the neighboring lateral tissues. JA-Me treatment on the abaxial side of leaf blade greatly increased the levels of JA-Me and jasmonic acid in leaf blade and petiole. Endogenous abscisic acid levels substantially increased during natural and JA-Me-induced leaf senescence, but 1-aminocyclopropane carboxylic acid levels did not change. The contents of cytokinins, gibberellins and auxins identified changed little during natural and JA-Me-induced leaf senescence. These suggest that a cooperative crosstalk between JAs and various hormonal signals, especially abscisic acid, occurs in regulation of G. biloba leaf senescence. Possible different action of JA-Me applied to the abaxial and the adaxial sides of the leaves on leaf senescence is discussed.

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Acknowledgements

This work was supported by Polish Ministry of Science and Higher Education through statutory funds of the Research Institute of Horticulture, Skierniewice, Poland.

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Correspondence to Marian Saniewski or Kensuke Miyamoto.

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Saniewski, M., Dziurka, M., Dziurka, K. et al. Methyl jasmonate induces leaf senescence of Ginkgo biloba L.: relevance to endogenous levels of plant hormones. Plant Growth Regul 91, 383–396 (2020). https://doi.org/10.1007/s10725-020-00612-5

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  • DOI: https://doi.org/10.1007/s10725-020-00612-5

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