Genetic variation in Araucaria cunninghamii provenances in Luiz Antonio-SP, Brazil

A.M Sebbenn,L.C Ettori,M.L.M Freitais,A.C.S Zanatto,A.S Sato

doi:10.12702/1984-7033.v05n04a09

Abstract

The genetic variation in traits of growth and shape and their distribution among and within ten Australian provenances of Araucaria cunninghamii was studied under the environmental conditions of Luiz Antonio, state of Sao Paulo. The provenance test was implanted in 1985 with six replications and row plots of four plants each. The F test of the analysis of variance showed significant differences at 1% probability among provenances for height and DBH at 20 years old. Of the total variation in height, DBH and trunk shape, variation among provenances accounted for 14.59%, 23.01% and 2.04%, respectively, after 20 years. At the same tree age, provenance Langkelly Creek performed best for traits DBH and height and Imbil Seed Orchard for trunk shape, while Bulburin performed worst for height and trunk shape and Jimna for DBH.

Highlights

The most important information evaluated in the area of forest improvement is related to the origin of seeds (Zobel and Talbert 1984)
The climatic variations in this great natural distribution can include from sometimes severe dry seasons in Australia to high precipitations in Papua New Guinea, occurrence of cyclones and strong wind in the coastal areas, to which the once well-established species is resistant, and frosts in mountainous areas, to which it is moderately resistant (Nikles and Newton 1983)
Genetic variation Survival rates were relatively high in the experiment, varying from 93.7% in five to 86.7% in 20-year-old trees (Table 2), indicating good adaptation of the plant material and its potential for reforestation in the environmental conditions of Luiz Antonio

Summary

Introduction

The most important information evaluated in the area of forest improvement is related to the origin of seeds (Zobel and Talbert 1984). In a study realized in Itapetininga – SP, with six A. cunninghamii provenances from Queensland, the four-year-old trees presented a mean height of 2.06 m, DBH of 2.32 cm and score of trunk straightness of 1.68.

Objectives

Results

Conclusion