Inbreeding depression in castor bean (Ricinus communis L.) progenies.

The purpose of this study was to investigate inbreeding depression (DE) in castor bean. From a population derived from the Guarani cultivar, 60 mother plants were sampled. Three types of progenies were obtained from each one: from self-pollination (AU), from crosses (CR) and from open pollination (PL). Grain yield of the progenies was evaluated in two locations. There was a strong interaction of progenies x locations, which led to obtaining estimates within each location. Broad variation was observed in inbreeding depression, with mean values of 6.7% and 13.4%, comparing AU progenies with PL progenies. It was observed that the population has high potential for selecting promising inbred lines. The frequency of mother plants generating progenies with simultaneous high general combination capacity and low inbreeding depression was low. Recurrent selection will increase the occurrence of parent plants associating these two properties, which is necessary for obtaining superior synthetic varieties. Key words: Castor bean, inbreeding depression, synthetic varieties, G x E interaction

Determinação de valores de composição química e da energia metabolizável de ingredientes para aves.

bitstream/item/58409/1/CUsersPiazzonDocuments236.pd

Granulometria do milho na amostra natural x amostra seca.

Projeto/Plano de Ação: 03.10.01.030

Integrating fungicide and biocontrol foliar spray on maize grain yield and fumonisin content.

The adoption of biocontrol is low in maize production, although it has been reported reduction in fumonisin levels when combined with fungicides. The objective of this work was to evaluate the potential of Streptomyces araujoniae (BC1) and Bacillus sp. (BC2) combined or not with the fungicide azoxystrobin+ciproconazol (FG), on grain yield, Fusarium verticillioides incidence and fumonisin (B1 and B2) content. Maize plants were sprayed two times, at V9 and R1 with Water, BC1, BC2, Fungicide alone or in different combinations two by two. All plants were inoculated with F. verticillioides. Upon harvest, treatments were evaluated for total yield, F. verticillioides grain contamination (blotter test) and total fumonisin (B1+B2) contents. FG (V9) + BC1 (R1) resulted in increased yield in three out of four field trials, while all other treatments increased yield in only two. All treatments except FG (V9 + R1) reduced F. verticillioides incidence. None of the treatments reduced fumonisin levels, but FG (V9 + R1), BC1 (V9) + FG (R1) and BC1 (V9) + BC1 (R1) resulted in higher mycotoxin content compared to the control. FG (V9) + BC1 (R1) increased yield, reduced grain contamination and didn?t contribute to higher fumonisin levels compared to control. Therefore, it can contribute to qualitative and quantitative maize grain yield improvement