Qualidade fisiológica e parâmetros genéticos em sementes de progênies de coentro

Abstract

Coriander (Coriandrum sativum L.) is a greenery, annual herb with a phenological cycle from three to four months. It is widely used in the Brazilian cuisine, with a huge number of producers involved in its productions, becoming a culture of great socioeconomic importance, especially for the horticulture in the North and Northeast of the country. For this purpose, it is essential to use seeds of suitable physical and physiological quality to obtain vigorous and uniform plants, and stands with productivity and quality. Therefore, it is important to realize researches with this culture, since there are a few studies involving genetic improvement and genetic parameters of coriander. This research aims to estimate the genetic parameters in the seeds germination and seedlings emergence of coriander submitted to germination test. For the experiment, a completely randomized design with 30 treatments (progenies) of four replicates was adopted. For the comparison of means, the Scott-Knot test was employed at 5% probability. The evaluated parameters were: first count (FC), percentage of germination (PG), germination speed index (GSI), germination and emergency mean times (MGT and MET), percentage of emergency (PE), emergence speed index (ESI), shoot and root system dry weights (SDW and RDW) and shoot and root lengths (SL and RL). For the variables that differed statistically, the following genetic parameters were estimated: phenotypic coefficient of variation (CVP), genotypic coefficient of variation (CVG), environmental coefficient of variation (CVE), CVG and CVE ratio, heritability (h2) and genetic gain (GG). The phenotypic coefficients of variation were high and the ratio of genotypic and environmental coefficients of variation was higher than one, indicating that the genetic effects stood out in relation to the environmental effects. Heritability ranged from 49.8% (RL) to 93.66% (E). It was possible to estimate genetic gains from 9.94% (MET) to 71.74% (SDW). The progenies 42, 53 and 58 presented the best results.