Variabilidade genética e propagação em progênies de mogno africano na região Norte de Mato Grosso

Abstract

in this study, the second chapter studied the seeds germination and early growth of African Mahogany seedlings from six arrays selected (FS04, FS05, FS11, FS15, FS30 and AF01). The study was conducted in Seedling Nursery Flora Sinop in the period between August 2013 and November 2014. It was found that there is variability between arrays and assessments in African Mahogany seeds germination (Khaya ivorensis A. Chev.), where were highlighted the seeds of matrices FS15, FS11, FS30, FS05 and AF01. Was not possible verify differences related with collar diameter, for the progenies height was possible. In the third chapter was evaluated the occurrence of genetic variation in African Mahogany's mini stakes. The aim was evaluate the cutting technique efficiency in vegetative propagation from cuttings responses coming from five matrices selected of African Mahogany (FS04, FS11, FS15, FS30 and AF01) on the survival, rooting and early growth. It was conducted a destructive analysis at 90 days after staking to evaluate leaf area, root length and root volume as well as amount of dry matter accumulated in leaves, roots and stem. It was found the presence of genetic variability for rooting and survival of mini stakes from the species, important to select superior genotypes. The results indicates that the species is feasible to minicutting propagation, obtaining rates greater than 69.7% rooting of cuttings and that is possible obtain better rooting with the application of 500 mg.L-1 (76.29%) and survival with 3000 mg.L-1 (79.08%) of AIB (indolbutiric acid). In the fourth chapter the progeny produced from seed and evaluated in chapter 2 were planted in the field to verify the genetic variability in early development. Were evaluated the progenies from six matrices selected and planted in spacing 3.6 x 4 m and external border with double line. The first evaluation was performed 90 days after planting in the field, where it was found that there is genetic variability among the selected materials, being the progenies from AF01 statistically superior in diameter and height. It was also determined that progeny coming from Seedling Nursery Flora Sinop were all grouped in just one class, suggesting a degree of kinship between them.