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Revista Chapingo serie ciencias forestales y del ambiente
versão On-line ISSN 2007-4018versão impressa ISSN 2007-3828
Resumo
ILLESCAS-GALLEGOS, Everardo et al. Factors influencing physical dormancy and its elimination in two legumes genus. Rev. Chapingo ser. cienc. for. ambient [online]. 2021, vol.27, n.3, pp.413-429. Epub 04-Mar-2024. ISSN 2007-4018. https://doi.org/10.5154/r.rchscfa.2020.06.041.
Introduction:
Prosopis laevigata (Humb. & Bonpl. ex Willd.) M. C. Johnst, P. glandulosa Torr., Vachellia schaffneri (S. Watson) Seigler & Eibinger, V. pennatula (S. Watson) Seigler & Eibinger and V. farnesiana (L.) Wight & Arn. are characteristic species of semi-arid areas. Their seeds show physical dormancy and are naturally scarified by chewing, trampling, digestive tract of fauna, fire, or washing away during rains.
Objective:
To describe the morphology of the seed coat of three species of Vachellia and two of Prosopis, and to assess the chemical, mechanical and thermal scarification of seeds.
Materials and methods:
Chemical (HCl for 30, 120, 150 and 180 min), thermal (80, 100, 120 and 140 °C for 3 min) and mechanical (sanding) scarification were applied. Resistance to breaking by compression was measured. The experimental design was randomized complete blocks per species.
Results and discussion:
Seeds showed a layer of lignified and impermeable macrosclereids, but the aleurone layer could not be detected. Sanding allowed germination from 81.2 to 100 %. Chemical and thermal treatments showed no differences, only in the case of P. laevigata, chemical scarification for 180 min caused higher germination (72.5 %) compared to the control. Vachellia schaffneri seeds were more resistant to compression (669 N) and had more intense dormancy (0.83, according to a proposed dormancy index), while P. glandulosa had the lowest dormancy (0.42).
Conclusions:
Mechanical scarification was the best method to eliminate dormancy in Vachellia and Prosopis seeds.
Palavras-chave : Vachellia; Prosopis; mechanical scarification; chemical scarification; thermal scarification.