VIABILITY OF THE MINI-CUTTING TECHNIQUE IN THE PRODUCTION OF Drimys brasiliensis Miers SEEDLINGS

Abstract

Drimys brasiliensis, popularly known as cataia or casca-d'anta, is a tree species native to the Atlantic Forest and belonging to the family Winteraceae. Due to its seeds have dormancy due to embryonic immaturity, the present work aimed to evaluate the viability of the mini-cutting technique in D. brasiliensis in different seasons of collection of the propagules. Mini-cuttings from seedlings sprouts previously produced by conventional cutting were collected at six different times (December/2015, February/2016, April/2016, June/2016, August/2016 and October/2016), made 6-8 cm long, with bevel cut at the base and rectum at the apex, keeping two leaves with their area halved. The experiment was carried out in a completely randomized design with 4 replicates and 14 mini-cuttings per experimental unit. The mini-cuttings were planted in tubes with substrate containing vermiculite and carbonized rice husk (1:1) and kept in a heated greenhouse. After 120 days, the percentage of rooted mini-cuttings, number of roots per mini-cuttings, length of the three largest roots by mini-cuttings, percentage of mini-cuttings with callus, live, dead, with shoots and leaves that maintained their original leaves were evaluated. Rooting percentages of mini-cuttings were greater than 75% regardless of the season of the year in which the propagules were collected. The adventitious root formation of D. brasiliensis occurs indirectly, from the callus tissue formed at the base of the mini-cuttings. The mini-cuttings technique is recommended for the production of seedlings of the species, at any seasons of the year.

Restoration potential of eight tree species from a seasonally dry tropical forest in southeast Piauí, Brazil

“…low yield from trees, low germination rate, seed dormancy) is to apply micropropagation techniques, such as the ones presented in Barroso et al (2018). For instance, Maggioni et al (2020) showed that the mini-cutting technique is a viable option to Tab. 2 Model coefficients and adjusted coefficient of determination (R 2 ) of the linear models used to describe the seedling's root collar diameter, height, and survival in relation to different doses of controlled-release fertilizer (CRF) for the eight evaluated species.…”

Size of mini-cuttings for the production of Sarcomphalus joazeiro (Mart.) Hauenshild seedlings

“…Clonal propagation by seminal minicuttings has been researched for several species of the Caatinga biome, such as Cedrela fissilis (XAVIER et al, 2003), Copaifera langsdorffii (DUTRA et al, 2014), Peltophorum dubium (MANTOVANI et al, 2017); Enterolobium contortisiliquum (FREITAS et al, 2018); Cabralea canjerana (BURIN et al, 2018), Hymenaea courbaril (MOURA et al, 2019); Drimys brasiliensis (MAGGIONI et al, 2020); Rubus sp. (JOAQUINI et al, 2021) and Myracrodruon urundeuva (LUZ et al, 2020;LEITE et al, 2021), in addition to the species Sarcomphalus joazeiro (SANTOS et al, 2021) object of this research.…”