Resumo

NOVAL-PONS, Blanca M. de la et al. activitys pattern of β-1,3-glucanases and quitinases in the AMF - systemin interaction in tomato. II Early symbiotic phase. cultrop [online]. 2017, vol.38, n.3, pp. 36-43. ISSN 1819-4087.

Systemin (s) and jasmonic acid (JA) play a central role in the damage response in tomato (Solanum lycopersicum). JA is also known to regulate the arbuscular mycorrhizal (AM) symbiosis in this and other plant species. An experiment was made in which the possible participation of the systemin in early stages of the establishment of the mycorrhiza was evaluated. Exogenous systemin appliction to a very rapid and transient increase of root glucanase and quitinase activity patterns at 3, 6 and 12 days after emergence (dae). Arbuscular mycorrhizal fungi (AMF) species produced a gradual increment leading to transient peaks of activity, at 3 and 6 dae (for chitinase) and 9 dae (for β-1,3-glucanase). The pattern suggests the establishment of a pre-symbiotic dialogue plant - AMF which appeared to be partly modulated by systemin, judging by the synergic effect on β-1,3-glucanase activity observed in the systemin and AMF treatment. A similarly positive effect on β-1,3-glucanase activity was observed after systemin application at the earliest colonization stages. The above suggests that systemin could impact the tomato mycorrhizal process with the modulation of defense responses

Palavras-chave : pectinolytic enzymes; mycorrhizae; defense mechanisms; sistemine.

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