Genetic parameters in full-sibling and half-siblin populations of citrus with potential for rootstock

The use of rootstocks in citrus cultivation is essential for seedling formation as it can interfere with various characteristics of the scion varieties, such as development, vigor, and precocity of production. This study aimed to evaluate the magnitude of genetic and environmental variations, estimating heritability parameters and genetic and phenotypic correlation between agronomic traits in citrus hybrids with potential as rootstocks. The experiment was conducted at Embrapa Mandioca e Fruticultura, in Cruz das Almas, Bahia, with a population of 80 hybrids of full siblings and half-siblings, grafted onto (HTR-069), andevaluated for height (AP), stem diameter (DC), and crown volume (volcopa) in May 2022 and May 2023. The statistical analysis, using mixed linear models, estimated heritability based on phenotypic, genetic variances, and the progenies × years interaction. The heritability based on progeny means was high for crown volume(78%) and height (72%), indicating a strong genetic influence. The progenies ×years interaction was significant for crown volume. These results show thatthere is significant variation in progeny performance across the evaluated years. The high coefficients of determination reinforce the significant interaction between progenies and years.