Flowering dynamics and seed production of Arachis pintoi and Arachis repens in the Brazilian Cerrados

摘要

Thirty-two accessions of the Caulorrhizae section of the genus Arachis were evaluated at 2 different sites in the Brazilian Cerrados, in terms of flowering period and intensity, seed yield and distribution in the soil profile. Flowering occurred between October and May with the accessions differing in the distribution, intensity and period of flowering. They exhibited a cyclic flowering pattern, with various peaks of production of flowers. Differences in maximum flowering intensity were also observedamong sites. The average seed yield 18 months after planting was 948 kg/ha at Location 1 (lowland area) and 327 kg/ha at Location 2 (well drained area). The accessions exhibited great variability for this trait, with an average broad-sense heritability(H2) value of 0.73. While 99% of the seeds were concentrated in the first 6 cm of the soil profile, seeds were recovered to 9 cm depth at Location 1 and to 12 cm at Location 2. Genetic variability was also observed for this trait.