Estimativa de parâmetros genéticos em sementes de caroba

GENETIC PARAMETERS IN SEED CHARACTERS OF Ormosia discolor UNDER DIFFERENT AMBIENT CONDITIONS

“…In this study, the lowest germination speed and the longest time were observed for the seeds at the highest temperature (35 °C). Results contrary to this study were obtained by Tomaz et al (2018), as the germination of O. excelsa presented lower GSI at ambient temperature of 30 °C and higher at 35 °C. Nascimento Júnior et al (2016) also found that higher temperatures increased the precocity of germination of Jacaranda copaia.…”

“…The best results were obtained at both ambient temperatures of 30 °C, increasing the possibility of significant gains with production of seedlings of the species. High heritability values (> 80%) for germination characters were also obtained for Amazonian seeds of S. pulcherrimum, O. excelsa, and J. copaia in similar studies (SANTOS et al, 2020;TOMAZ et al, 2018;NASCIMENTO JÚNIOR et al, 2016). These results are important for selection of seeds with superior characters for the formation of vigorous orchards that meet the needs of reforestation in degraded areas, besides conserving their respective matrices or progenitors.…”

“…Fresh weight ranged between 0.29 to 0.17 g (mean of 0.2 g), length ranged between 9.3 to 6.3 mm (mean of 7.7 mm), width ranged from 8.4 to 6.6 mm (mean of 7.6 mm), and thickness ranged between 6.1 to 4.9 mm (mean of 5.5 mm), demonstrating that the seeds were not uniformly sized (Table 6). For the strong effects caused by the ambient temperature in biometric data, the experimental coefficients of variation are considered satisfactory for this analysis (TOMAZ et al, 2018;NASCIMENTO JÚNIOR et al, 2016).…”

“…Through direct selection applied to the germination characters, the most expressive results, as expected, were estimated for GR and GSI in the three ambient conditions, as in studies of this nature these two indices are commonly highlighted, demonstrating to be the main variables for selection. In studies by Tomaz et al (2018) andNascimento Júnior et al (2016), the highest selective gains were also estimated for germination rate, with 17.3% for the species O. excelsa and 28.1% for J. copaia. These studies are important for High gains by direct selection must be accompanied by significant genetic variability between the characters evaluated.…”

“…It is important to highlight that high and favorable correlations to selection allow satisfactory indirect gains for all other characters, being an efficient procedure for distributing the expected gains adequately (TOMAZ et al, 2018). Other studies with seeds of native species from the Amazon also used genetic correlations to select characters of interest, simplifying the selection process for obtaining the desired gains (SANTOS et al, 2020;NASCIMENTO JÚNIOR et al, 2016).…”