PRODUCTION OF MINI-CUTTINGS AND THE INFLUENCE OF LEAF REDUCTION ON ROOTING OF VINHÁTICO (Plathymenia foliolosa Benth.)

Abstract

-The objective of this work was to evaluate the production and survival of the mini-stumps in mini-clonal hedge and the effect of leaf reduction of mini-cuttings on rooting and seedling growth of progenies of Vinhático (Plathymenia foliolosa) by mini-cutting. Apical mini-cuttings were used to evaluate the influence of leaf reduction on the rooting of vinhático; the mini-cuttings ranged between 8 to 10 cm in length and samples were subjected to100% leaf reduction (without leaf), 75% of leaf reduction, or no leaf reduction. As for the survival of mini-stumps in mini-clonal hedge, after the fourth successive mini-cuttings collection, P3 and P19 progenies showed the highest survival percentages (64.5% and 61.5%, respectively), while progenies P1 (32.3 %) and P45 (25%) showed the lowest values for this parameter. The average number of minicuttings/mini-stump/collection produced ranged from 0.83 (progeny 53) to 4.8 (progeny 01) and the average productivity was 120 m² mini-stumps/mini-cuttings per collection. These results suggest that leaf reduction in adventitious rooting in mini-cuttings did not result in any difference between foliar treatments without reduction and 75% leaf reduction; however, 100% mortality was observed when the mini-cuttings were made with total leaf reduction.The progenies studied showed potential regeneration of mini-stumps, thus allowing the realization of successive collections of young shoots.Keywords: Clonal forestry; Vegetative propagation; Cloning. PRODUÇÃO DE MINIESTACAS E O EFEITO DA REDUÇÃO FOLIAR NO ENRAIZAMENTO DE VINHÁTICO (Plathymenia foliolosa Benth.)RESUMO -Objetivou-se com o presente estudo avaliar a produção e sobrevivência de minicepas em minijardim clonal e o efeito da redução foliar das miniestacas no enraizamento e crescimento das mudas de progênies de vinhático (Plathymenia foliolosa) via miniestaquia. Foram utilizadas miniestacas da parte apical com altura variando de 8 a 10 cm de comprimento, sendo os tratamentos constituídos por 100% de redução foliar (sem folha), com 75% de redução foliar e sem redução foliar. Quanto à sobrevivência das minicepas em minijardim clonal, após a quarta coleta sucessiva de miniestacas, as progênies P3 e P19 apresentaram os maiores percentuais de sobrevivência (64,5% e 61,5%, respectivamente), enquanto as progênies P1 (32,3%) e P45 (25%), os menores valores observados quanto a essa avaliação. O número médio de miniestacas/ minicepa/coleta produzidas variou de 0,8 (progênie 53) a 4,8 (progênie 01), sendo a produtividade média das minicepas/m² de 120 miniestacas por coleta. Com base nos resultados obtidos, concluiu-se que há influência da redução foliar das miniestacas no enraizamento adventício, que os tratamentos sem redução foliar e com 75% de redução não apresentaram diferenças significativas, no entanto, foi observado 100% de mortalidade das miniestacas quando feita a redução total das folhas. Concluiu-se também que as progênies estudadas apresentaram potencial quanto à regeneração das minicepas, permitindo, assim, a realização ...

VEGETATIVE PROPAGATION OF Mimosa Caesalpiniifolia BY MINI-CUTTINGS TECHNIQUE

“…Results found here are similar to what was found in other studies on leaf area reduction of mini-cuttings in diff erent forest species (Santana et al, 2010;Batista et al, 2014;Correia et al, 2015;Dias et al 2015;Neubert et al, 2017;Fernandes et al, 2018;Mayer et al, 2018;Santana et al, 2018;Araújo et al, 2019). These studies have demonstrated that maintaining whole leaves provides rooting maximization and that reducing leaf area is not a standard procedure in the process of preparing mini-cuttings.…”

“…Some species can easily survive at the successive pruning and be responsive to the management adopted in the trough, as observed for Myracrodruon urundeuva mini-stumps that had 100% of survival after fi ve pruning (Justino et al, 2017). On the other hand, some genotypes have low survival of mini-stumps, such as some progenies of Plathymenia foliolosa, with survival less than 25% after four pruning (Neubert et al, 2017). Mimosa caesalpiniifolia proved to be responsive to the management adopted in the trough as well as to the successive pruning, having mini-stump survival of 80% after the sixth pruning.…”

“…Roots formation is essential for propagation by mini-cutting technique and characters such as the percentage of rooting, surviving, dynamic of rooting, number of roots, length and dry mass of roots can be infl uenced by a number of factors and their interactions, as follow the age of the donor plant, hormonal balance, carbohydrate content, mini-cut type, sheet maintenance, substrates, and the application of growth regulators (Neubert et al, 2017;Araújo et al, 2019;Rasmussen et al, 2020;Saha et al 2020;Pimentel et al, 2021;Xavier et al, 2021). Thereby, the establishment of the mini-cut protocol for Mimosa Caesalpiniifolia would provide an alternative method of propagation for this specie, overcome the diffi culties associated with seminal propagation, and increase the possibility to get more plants for restoration projects in Caatinga Biome and commercial plantations of these specie.…”

REDUÇÃO FOLIAR NA PRODUÇÃO E SOBREVIVÊNCIA DE MINIESTACAS DE Eucalyptus urophylla var. platyphylla

“…Objetivando obter melhores resultados tanto na produção quanto na qualidade nos processos de produção de mudas clonais encontram-se na literatura várias recomendações para o padrão de estacas, dentre estas está a técnica da redução foliar (SOUZA et al, 2013;MORAIS et al, 2014;STUEPP et al, 2015;CORREIA et al, 2015;DIAS et al, 2015;OLIVEIRA et al, 2015;LAFETÁ et al, 2016;ENGEL et al, 2016;NEUBERT et al, 2017;FREITAS et al, 2017).…”

Vegetative Propagation of Hymenaea Courbaril L. And Apuleia Leiocarpa (Vogel) J. F. Macbr. By Mini-Cutting

“…The rooting of cuttings and mini-cuttings varies among species and between clones/progenies of the same species (Neubert et al, 2017), and may be infl uenced by intrinsic plant-related factors and extrinsic factors related to environmental conditions. Intrinsic factors include the genetic constitution of the plant, the endogenous level of inhibitors, cutting techniques, plant age and nutritional and water conditions of the parent plant (Cavalcante et al, 2019;Guimarães et al, 2019).…”