The cocoa relatives T grandiflorum (cupuaçu) and T bicolor (macambo) are promising crop plants for sustainable agroforestry in the Amazon region of South America. The market for cupuaçu is expanding since the fruit flesh is utilised by the foodstuffs industry. Attempts to commercialise chocolatelike wares from the seeds have failed so far because of unreliable product quality. It is not known whether this is due to an insufficient aroma potential of cupuaçu seeds. We therefore investigated the proteolytic enzymes and the seed storage globulins which are both decisive for the formation of aroma precursors in cocoa. We found that the activities of the aspartic endopeptidase and the carboxypeptidase in T bicolor and T grandiflorum differed slightly from those in cocoa. The specificity of the carboxypeptidase for hydrophobic amino acids was quite similar across the three species, while the optimal pH of the T grandiflorum enzyme was lower than that of the other species. The qualitative and quantitative differences between the globulins indicate a lower maximum yield of aroma precursors in T grandiflorum and a higher maximum yield of aroma precursors in T bicolor, compared to cocoa. We conclude that the quality of chocolate-like products made from the studied cocoa relatives can be improved by adapting fermentation procedures to particular biochemical features of these seeds.

-This paper describes the development of breeding programs in northern Brazil

The objective of this work was to characterize 119 accessions of guava and 40 accessions of "araçá" sampled in 35 Brazilian ecoregions, according to the International Union for the Protection of New Varieties of Plants (UPOV) descriptors. The majority of "araçá" accessions presented wide spacing of leaf veins, while guava accessions presented medium to close spacing. Most fruits of "araçá" accessions were classified as small, contrasting with medium to large fruits of guava accessions. Most of "araçá" accessions (91%) presented white flesh fruit color, while 58% of guava accessions presented pale pink, pink and dark pink colors. Fruit differences among wild and cultivated Psidium species indicate fruit as the most altered trait under artificial selection.

A large germplasm prospecting expedition was carried out in different ecoregions in ten Brazilian States in order collect and characterize Psidium guajava L. and another Psidium species, known as araçá. Ecogeographic sampling areas were defined based on eco-geographical zoning and vegetation maps. The accessions were characterized for 40 descriptors, according to the International Union for the Protection of New Varieties of Plants guidelines. One hundred and nineteen guava accessions and 40 araçá accessions araçá were sampled and characterized in 35 different Brazilian ecoregions. The most invariable descriptors for both guava and araçá were color of young shoots, leaf pubescence on lower side, leaf blade length and width, leaf variegation, fruit surface relief, fruit longitudinal ridges and grooves and evenness of fruit flesh color. The large majority of araçá accessions presented widely spaced leaf veins, contrasting with the guava accessions that presented medium to close spacing. Most fruits of araçá accessions were classified as small, while most fruits of guava accessions were grouped into the class of medium size. For the fruit flesh color, 91% araçá were grouped as cream and white, while 58% guava accessions presented pale pink, pink and dark pink coloring. These fruit differences among wild Psidium species and guava suggested that the fruit traits have been the most altered trait by artificial selection.

The Amazon region contains the world’s leading genetic reserve of native plants, with most of the area located in Brazil. This region is rich in species that little known or still unknown by the population at large, including species that produce non-timber forest products (NTFPs) such as edible nuts. The objective was to verify the occurrence of these edible nuts in Brazil, to evaluate their potential and the possibility of other uses, in addition to expanding the knowledge about them. A bibliographic review of the last 50 years was carried out, mainly using the descriptors the popular name and the scientific name of the four nut trees present in the Amazon and their respective families, namely: agouti nut (Acioa edulis Prance) and egg nut (Acioa longipendula Pilg.) From the Chrysobalanaceae family, and sapucaia nut (Lecythis Pisonis Miers) and Brazil nut (Bertholletia excels Bonpl.) From the Lecythidaceae family. The Chrysobalanaceae has 450 species and 17 genera of woody plants and shrubs, producing oilseeds by some species, including egg and agouti nuts. The Lecythidaceae, on the other hand, has approximately 17 genera and 300 species, and in Brazil it is possible to find 9 genera and 122 species, 54 of them endemic, some of which produce edible seeds such as sapucaia and Brazil nuts. Those species have a great nutritional potential, and the chemical composition of their nuts reveals a good amount of lipids and proteins, but more in-depth research on the subject is necessary, including on other biases for better knowledge of the species, discovery of other potential uses and benefits and, consequently, their valorization.