Rhizome characteristic and essential oil yield of Etlingera elatior clumps in different environments
Etlingera elatior is a multifunctional plant used mainly for ornamental and medicinal purposes, popularly known as torch ginger. The propagation of these plants is usually done by clump division and the rhizome is the propagation unit. The rhizome is also important for the essential oil extraction, but despite its importance works about torch ginger rhizome characteristics, clump management or essential oil yield are scarce. This study aimed to characterize the rhizomes and clumps of torch ginger cultivated in two different field conditions in Brazil. Seven E. elatior genotypes (IAC 1, IAC 2, IAC 3, IAC 11, IAC 13, IAC 26 and IAC Prumirim) from the IAC collection were cultivated in Paulista-PE at the Forest Zone (07°5673S; 34°5467W, 100 m a.s.l., tropical climate, 24-28°C average temperatures and 1897 mm average annual rainfall) and at coastal with semi-arid zone (4°1107S; 38°3007W and altitude of 70 m a.s.l., tropical climate, 26-28°C average temperature and 1020 mm average annual rainfall) in Pacajus-CE. Twenty-eight months after planting the clumps were removed, cleaned and photographed. Characteristics from the rhizome, shoots and essential oil yield and content were analysed. It was possible to observe the Y system in the rhizome distribution, in clumps cultivated in Paulista. Nevertheless, it was not possible to observe clearly the geometric distribution in Pacajus due to the high number of rhizomes. The genotypes cultivated in Paulista presented differences in the rhizomes diameter and ramets length. In Pacajus, no differences were observed for these characteristics. Comparing the environments, all values were higher in Paulista, except for ramets length for the genotype IAC 2. The genotypes IAC 3 and IAC 26 presented higher dry biomass of rhizomes per clump in both environments, but the higher yield of essential oils only in Pacajus (0.08 and 0.09%, respectively). It was possible to observe that the environment conditions interfere in the rhizomes clumps characteristics of E. elatior.
Araújo, P.G.P., Castro, A.C.R., da Silva, S.A.C.G., Gonçalves, C., Oliveira, J.C.S., Oliveira, L.L.D.S.S. and Loges, V. (2019). Rhizome characteristic and essential oil yield of Etlingera elatior clumps in different environments. Acta Hortic. 1263, 111-118
ginger torch, genotypes, production