Videira 'Syrah' sobre diferentes porta-enxertos em ciclo de inverno no sul de Minas Gerais

O objetivo deste trabalho foi avaliar a influência de porta-enxertos sobre as características agronômicas, ecofisiológicas e qualitativas da videira 'Syrah' manejada por meio da técnica da dupla poda. As videiras foram enxertadas nos porta-enxertos 'SO4', '110 Richter' e '1103 Paulsen', e sustentadas em sistema espaldeira sem irrigação. Foram avaliadas as características ecofisiológicas, de produção e de composição físico-química das bagas maduras em três safras (2007, 2008 e 2010). Os porta-enxertos não exerceram influência sobre o potencial hídrico de base, que apresentou valores próximos a -0,2 MPa, o que indica que não houve restrição hídrica no solo ao final da maturação (junho). Também não houve diferença significativa quanto à produção. O porta-enxerto '1103 Paulsen' conferiu menor vigor, menor taxa fotossintética e melhores resultados de maturação, para as safras com menores precipitações. Os porta-enxertos '110 Richter' e 'SO4' apresentaram maior vigor nas condições meteorológicas de 2010 e as maiores taxas fotossintéticas para o mesmo período. As condições meteorológicas tiveram efeito significativo na maturação tecnológica e fenólica, com os melhores resultados para os anos mais secos. O porta-enxerto '1103 Paulsen' fornece melhor equilíbrio entre vigor e produção, o que aumenta a qualidade da uva.

Notes and new taxa in Acanthoderini (Coleoptera: Cerambycidae: Lamiinae). V. Three new genera and notes on Irundisaua.

Generic characters of Irundisaua Martins & Galileo, 2005 are expanded (antennal formula, width of prosternal process inferior or equal to the diameter of procoxa, protibia enlarged and flattened) and two species are transferred from Acanthoderes Audinet-Serville, 1835: I. forsteri (Tippmann, 1960) comb. nov from Peru and Brazil (Amazonas) and I. ucayalensis (Tippmann,1960) comb. nov from Ecuador, Peru and Brazil (Amazonas).Three new genera are described: (1) Catuana gen. nov., type species, C. spinicornis (Tippmann, 1960) comb. nov, characterized by the mesosternal tubercle; (2) Mundeu gen. nov, type species, M. maculicollis (Bates, 1861) comb. nov, with rounded sides of protorax and expanded protibiae; (3) Urangaua gen. nov, with eyes divided and finelly granulated, length of antenomeres III-IV subequal to V-XI; the genus is proposed of two species: U. analis Melzer, 1935 comb. nov, type species, and U. subanalis (Zajciw,1964) comb. nov. A key to the species of Urangaua is added.

New taxa and new record of Hemilophini (Coleoptera: Cerambycidae: Lamiinae).

New species described and illustrated: Adesmus nigrolineatus sp. nov from Mexico (Oaxaca). From Costa Rica: A, moruna sp. nov. (Heredia); Corcovado bezarki sp. nov. (Guanacaste); Alampyris fuscus sp. nov. (Guanacaste), Cariua gen. nov type species C. sulphurea sp. nov. (Guanacaste). From Bolivia: Phoebemima albomaculata sp. nov. (Cochabamba); Ipepo gen. nov type species I. dilatatus sp. nov. (Santa Cruz). From Brazil: Adesmus facetus sp. nov and Canarana arguta sp. nov. (Rondonia). A new record from Costa Rica of Piruanycha pitilla Galileo & Martins, 2005 is added. The three new species of Adesmus are recognized: A. nigrolineatus by the longitudinal black stripes on elytra; A. moruna by the elytra entirely black; A. facetus by the white belts behind the middle of the elytra and white maculae on apical quarter. Phoebemima albomaculata is characterized by the white macula on the elytral suture. Corcovado bezarki sp. nov is distinguished by the black antennal scape and whitish flagelomeres. Canarana arguta sp. nov has prothorax and urosternites I-IV covered by dense yellowish pubescence. Alampyris fusca sp. nov differs from A. cretaria by the antenomere III longer than scape. Cariua sulphurea sp. nov is distinguished by the urosternites covered by compact white pubescence and Ipepo dilatatus is characterized by the elytra with three carinae.

New taxa of Hemilophini (Coleoptera, Cerambycidae, Lamiinae) of the Americas

New taxa of Hemilophini (Coleoptera, Cerambycidae, Lamiinae) of the Americas. The new genus Mexicoscylus is described to include: M. rosae sp. nov., type species of the genus, and M. bivittatus (Gahan, 1892), comb. nov. both from Mexico. A key to the species of Mexicoscylus is added. More three species are described: Cotycuara villosa sp. nov., from Costa Rica; Phoebe parvimacula sp. nov., from Bolivia and Adesmus beruri sp. nov., from Brazil (Amazonas). All new species are illustrated.

Reproductive biology and species geographical distribution in the Melastomataceae: a survey based on New World taxa

Apomictic plants are less dependent on pollinator services and able to occupy more diverse habitats than sexual species. However, such assumptions are based on temperate species, and comparable evaluation for species-rich Neotropical taxa is lacking. In this context, the Melastomataceae is a predominantly Neotropical angiosperm family with many apomictic species, which is common in the Campos Rupestres, endemism-rich vegetation on rocky outcrops in central Brazil. In this study, the breeding system of some Campo Rupestre Melastomataceae was evaluated, and breeding system studies for New World species were surveyed to test the hypothesis that apomixis is associated with wide distributions, whilst sexual species have more restricted areas. The breeding systems of 20 Campo Rupestre Melastomataceae were studied using hand pollinations and pollen-tube growth analysis. In addition, breeding system information was compiled for 124 New World species of Melastomataceae with either wide (1000 km) or restricted distributions. Most (80 ) of the Campo Rupestre species studied were self-compatible. Self-incompatibility in Microlicia viminalis was associated with pollen-tube arrest in the style, as described for other Melastomataceae, but most self-incompatible species analysed showed pollen-tube growth to the ovary irrespective of pollination treatment. Apomictic species showed lower pollen viability and were less frequent among the Campo Rupestre plants. Among the New World species compiled, 43 were apomictic and 77 sexual (24 self-incompatible and 53 self-compatible). Most apomictic (86 ) and self-incompatible species (71 ) presented wide distributions, whilst restricted distributions predominate only among the self-compatible ones (53 ). Self-compatibility and dependence on biotic pollination were characteristic of Campo Rupestre and narrowly distributed New World Melastomataceae species, whilst apomictics are widely distributed. This is, to a certain extent, similar to the geographical parthenogenesis pattern of temperate apomictics.