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- Title
MORFOMETRIA E LIGNIFICAÇÃO EM FUNÇÃO DA APLICAÇÃO DE ÁCIDO JASMÔNICO EM MUDAS DE IPÊ ROXO E GUAJUVIRA.
- Authors
Heberle, Karina; Lopes Dranski, João Alexandre; de Matos Malavasi, Marlene; Contro Malavasi, Ubirajara
- Abstract
Hardening aims to expose seedlings to severe management conditions than those adopted during the growing phase in order to make it more tolerant to post-planting stresses. This work aimed to evaluate the effect of jasmonic acid (JA) on Handroanthus impetiginosus and Patagonula americana seedlings on the morphophysiology and initial field growth. The experiment consisted of a completely randomized design in the nursery and a randomized block in the field with four treatments (0, 0.5, 1.0 and 1.5 μmol L-1 of JA) and five replications of four seedlings each. Ninety day after outplanting morphometric analyzes, SPAD index, shoot/root ratio (H/D), above/below ground dry biomass ratio and Dickson quality index (DQI) were calculated. Seedlings of H. impetiginosus showed smaller increment in height and H/D ratio for the three doses of JA compared to the control seedlings. H/D ratio was reduced with all doses of JA. The 1.0 μmol L-1 of JA increased DQI and above ground tissue lignin. With guajuvira seedlings, applicatin of 1.0 μmol L-1 and 1,5 μmol L-1 increased stem diameter. There was a reduction in the H/D with the three doses of JA. In the evaluation of the DQI and lignin content of aboveground tissues there was an increase with the 1.0 μmol L-1 concentracion. Spraying of JA resulted in increased lignin in aboveground tissues of both species and in root tissues of ipê seedlings. The JA proved to be efficient in hardening and initial growth with the 1.5 μmol L-1 dose resulting in higher seedlings quality for ipê and the 1.0 μmol L-1 dose for guajuvira seedlings.
- Publication
Scientia Agraria Paranaensis, 2018, Vol 17, Issue 3, p317
- ISSN
1677-4310
- Publication type
Article