No abstract

No abstract

No abstract

Influence of broiler manure application methods and spacing arrangement between plants on Peruvian carrot economic yieldPeruvian carrots is an excellent alternative for small and medium farmers, especially within the concepts of family farming. Thus the aim of this study was to evaluate the agricultural economic yield of this crop when managed under two plant spacing arrangements (20 and 25 cm between plants) and different application methods of dried broiler manure on the soil [surface-applied (10 t ha

No abstract

Croton urucurana, known as "sangra-d'água", is a tree species with timber and beekeeping potential, and also with medicinal potential. The use of microsatellite markers, simple sequence repeats (SSRs) is efficient in population genetic studies, with high transferability rate between correlated species. The present study aimed to optimize the polymerase chain reaction (PCR) protocol and to test the transferability of seven primers developed for Croton floribundus to C. urucurana. The amplification of 113 accessions from different Brazilian biomes (Cerrado, Pantanal and Mata Atlântica) was tested. For optimization, the concentration and label of the MgCl 2 reagent was varied in addition to annealing temperature. Four tested primers showed amplification products, guaranteeing 57% of transferability. This result confirms the efficiency of C. floribundus microsatellite loci for future studies of genetic variability in C. urucurana.

Assessing the parental genetic differences and their subsequent prediction of progeny performance is an important first step to assure the efficiency of any breeding program. In this study, we estimate the genetic divergence in Eucalyptus camaldulensis based on the morphological traits of 132 progenies grown in a savanna biome. Thus, a field experiment was performed using a randomized block design and five replications to compare divergences in total height, commercial height, diameter at breast height, stem form and survival rate at 48 months. Tocher’s clustering method was performed using the Mahalanobis and Euclidian distances. The Mahalanobis distance seemed more reliable for the assessed parameters and clustered all of the progenies into fourteen major groups. The most similar progenies (86 accessions) were clustered into Group I, while the most dissimilar (1 progeny) represented Group XIV. The divergence analysis indicated that promising crosses could be made between progenies allocated in different groups for high genetic divergence and for favorable morphological traits.

Microalgae production is expensive and demands high volumes of water and energy to meet all market demands and yet the production of secondary metabolites using alternative media needs deeper studies. Among alternative media, the use of sugar cane vinasse has gained attention for microalgae cultivation. In this work, we’ve compared the biomass yield and secondary metabolites of Chlorella sorokiniana grown in a commercial medium (Sueoka) and in alternative medium prepared with cane vinasse (0.1%) supplemented with N, P2O5 and K2O (commercial formula 20-5-20 g.L-1). The production of microalgae biomass grown in an alternative medium was 2.2% lower, but reached its maximum growth point 14 days faster than the commercial medium. The average level of Phenolic compounds on the commercial medium were 6.02 ± 0.13 mg GAE .g-1 and increased to 15.28 ± 0.32 mg GAE.g-1when C. sorokinianawere grown in the vinasse medium. Same how, Flavonoids contents varied from 13.12 ± 1.33 to 72.30 ± 5.28 mg QE. g-1 to commercial and vinasse medium, respectively. The maximum AOA of C. sorokiniana grown in vinasse medium was 88.05% at a concentration of 1500 µg.mL-1 of extract, with IC50 at 357.7 ± 27.35 µg.mL-1. Different factors seem to induce variances on secondary metabolites synthesis, mostly stress due to QOD and ions added to the medium by vinasse. The authors recognize there are more investigations to be done, but increasing a natural and low cost pathway for flavonoids yield open up an interesting field for the bioprospection of microalgae.