Abstract
Abstract: Rangpur lime is the most commonly used rootstock in Brazil, and its propagation occurs through seeds. Currently, no methodology is described in the prescriptions of the Rules for Seed Testing to perform the germination test of Rangpur lime. Thus, this research aimed to study the dynamics of germination in Rangpur lime seeds according to the Weibull distribution under the effect of different temperatures and lots. The experiment was conducted in a completely randomized design, with treatments arranged in a 3 × 5 factorial scheme (temperatures of 25, 30 and 35 °C for the germination test and five seed lots, respectively) and four replications. The percentage of germination, the number of days required obtaining 50% of germination, and the parameters of the Weibull equation were determined. The optimum temperature for germination of Rangpur lime seeds was 30 °C, with the first and last counts at 21 and 30 days after test installation, respectively. The germination process can be described by the three-parameter Weibull cumulative distribution function.
Highlights
The propagation in the various species of citrus rootstocks is carried out using seeds, which results in a better development of the taproot system of the seedling and, of the plant, requiring high physiological quality seeds.Indicators obtained in the germination test are essential to the production planning of seedlings producer since the commercialization of citrus seeds requires the evaluation of seed viability through germination or tetrazolium tests (Brasil, 2013).the objective of the germination test is to determine the maximum germination potential of a seed lot (Brasil, 2009; Marcos-Filho, 2015)
This research aimed to evaluate the germination test procedure of Rangpur lime seeds from different lots and temperatures and study the dynamics of germination according to the Weibull distribution
The percentage of germination was lower for all lots at 35 °C. These results show that the germination test of Rangpur lime seeds is negatively influenced by the temperature of 35 °C, identified by the occurrence of seedling abnormalities mainly caused by thickening and shortening of the root system
Summary
The propagation in the various species of citrus rootstocks is carried out using seeds, which results in a better development of the taproot system of the seedling and, of the plant, requiring high physiological quality seeds.Indicators obtained in the germination test are essential to the production planning of seedlings producer since the commercialization of citrus seeds requires the evaluation of seed viability through germination or tetrazolium tests (Brasil, 2013).the objective of the germination test is to determine the maximum germination potential of a seed lot (Brasil, 2009; Marcos-Filho, 2015). The propagation in the various species of citrus rootstocks is carried out using seeds, which results in a better development of the taproot system of the seedling and, of the plant, requiring high physiological quality seeds. Indicators obtained in the germination test are essential to the production planning of seedlings producer since the commercialization of citrus seeds requires the evaluation of seed viability through germination or tetrazolium tests (Brasil, 2013). The use of a standardized procedure for the installation, conduction, and evaluation of the germination test allows for achieving comparable results between official and accredited laboratories. The Brazilian rules for seed testing have no reference regarding the methodology for carrying out the citrus germination test (Brasil, 2009)
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