Abstract
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 mini-cuttings/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.
Highlights
INTRODUCTIONThe last few decades has witnessed the continuous use of the native forest species together with the deforestation aimed at the implantation of pastures and agricultural crops, which has resulted in a drastic reduction in the area of the native forests around the world (Gatti, 2002)
The average number of minicuttings/mini-stump/collection produced ranged from 0.83 to 4.8 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; 100% mortality was observed when the mini-cuttings were made with total leaf reduction.The progenies studied showed potential regeneration of mini-stumps, allowing the realization of successive collections of young shoots
The last few decades has witnessed the continuous use of the native forest species together with the deforestation aimed at the implantation of pastures and agricultural crops, which has resulted in a drastic reduction in the area of the native forests around the world (Gatti, 2002)
Summary
The last few decades has witnessed the continuous use of the native forest species together with the deforestation aimed at the implantation of pastures and agricultural crops, which has resulted in a drastic reduction in the area of the native forests around the world (Gatti, 2002). Plathymenia foliolosa Benth (vinhático) is a typical species of the Atlantic Forest, with high economic potential for timber production and recovery of degraded areas (Oliveira et al, 1998); studies on this species aimed at the optimization of seedling production techniques are highly desirable. It is a heliophite species, with irregular occurrence and discontinuous in area of occurrence (Souza and Lorenzi, 2008).
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