Caracterização silvicultural, identificação de genes Rht alumínio tóxico em jenipapeiros de quatro procedências do Recôncavo Baiano

Abstract

The study aimed at identifying genetic dissimilarity from silvicultural characteristics of Genip trees from Cruz das Almas, Sapeaçu, Governador Mangabeira and Cabaceiras do Paraguaçu as well as evaluating the behaviour of this species under toxic levels of aluminium and identifying the presence of the gene Rht by means of AG3 insensitivity. The studied silvicultural characteristics were: diameter at 1.30 m breast height (dap), total height (Ht), stem height (Hf), basal area (AB), stem quality (QF), lighting of the crown (IC), and crown quality (QC). The Genip trees were submitted to doses of 0, 30, 60 and 90 mg l-1 Al+3 in a completely randomized design with three replications, determining the characteristics: root length (CR), new growth of the primary root (RRP), shoot length (CPA), and length of secondary roots (CRS). To detect the presence of the gene Rht, doses of 0 and 100 mg l-1 AG3 were used and the characteristics referring to the shoot length (CPA) and root length (CR) were measured. In the analysis of dissimilarity, the clustering with the Gower algorithm showed two separate groups. There was a significant difference according to the tested aluminium doses. The evaluated native Genip trees exhibited sensitivity to AG3 at the dose 100 mg l-1, showing absence of Rht genes, responsible for the identification of genotypes of short stature.