ISHS Acta Horticulturae 569: I Latin-American Symposium on the Production of Medicinal, Aromatic and Condiments Plants
FLOWERING OF ARTEMISIA ANNUA L. PLANTS SUBMITTED TO DIFFERENT PHOTOPERIOD AND TEMPERATURE CONDITIONS |
| Authors: | J.A. Marchese, V. Casiraghi, R. Lira, A.C. Tedesco, V.L.G. Rehder |
| Keywords: | artemisinin, juvenility, photoperiodism, thermoperiodism, vernalization. |
| Abstract:
Leaves of A. annua are a plentiful source of artemisinin, a drug with proven effectiveness against malaria disease. The objective of this study was to evaluate the effect of different photoperiod and temperature conditions in the flowering of clones from one A. annua genotype whose parentages are original from Vietnanm, comparing it with a studied genotype original from China. The experiments were carried out in photoperiodic chambers located inside of plastic houses. The clones were submitted to photoperiods of 7, 9, 11, 13, 15 and 17 h, in two natural conditions of temperature: spring/summer (maxim of 37ºC and minimum of 19ºC) and autumn/winter (maxim of 29ºC and minimum of 13ºC). In advance, it can be affirmed that the Vietnanm genotype clones presented a photoperiodic behavior of Short-Day Plants (qualitative or absolute) with low temperature or vernalization requirement to have their flowering accelerated. The critical or inductive photoperiod ranged between 11 and 13 h to Vietnanm genotype and 13 and 15 h to Chinese genotype. The Vietnanm genotype plants flourished about 4-5 wk after submitted to the inductive photoperiod, while the Chinese genotype plants flourished in 2 wk. With regard to flowering, A. annua genotypes with different geographical origins can present variations in the behavior under same photoperiod and temperature conditions. | |
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