Dallacort 5RESUMO -Com o objetivo de indicar qual ambiente, telado ou campo aberto, fornece melhores condições para a produção e maior resistência ao pendoamento de diferentes cultivares de alface lisa, para as condições climáticas de Cáceres-MT, desenvolveu-se esse trabalho no período de fevereiro a abril de 2011. Foram avaliados vinte tratamentos, empregando o delineamento experimental em blocos casualizados em esquema fatorial 5 x 4, sendo cinco ambientes de cultivo (telas de sombreamento 30 e 50%, telas termo-refletoras 30 e 50% e campo aberto) e quatro cultivares de alface tipo lisa (Elisa, Elizabeth, Regiane e Regina), com quatro repetições. A colheita foi realizada aos 30 dias após o transplante. As cultivares de alface lisa mais produtivas foram Regiane, que obteve maior número de folhas e Regina com menor comprimento de caule. Os ambientes de cultivo que aumentaram a resistência ao pendoamento da alface foram as tela de sombreamento e termorefletora 50%. As cultivares não apresentaram diferenças significativas entre si quanto à resistência ao pendoamento. Palavras-chave:Lactuca sativa L. Cultivo protegido. Florescimento. Tela de sombreamento. Tela termorefletora.ABSTRACT -This work was developed during the period of February to April, 2011, with the objective of indicating which environment, greenhouse or open field, provides better conditions for production, and greater resistance to bolting of different cultivars of loose-leaf lettuce, for the climatic conditions of Cáceres, Mato Grosso, Brazil, Twenty treatments were evaluated, using a randomized block experimental design in a 5 x 4 factorial of five environmental conditions (shading screens of 30 and 50%, heat-reflective screens of 30 and 50%, and open field) and four cultivars of loose-leaf lettuce (Elisa, Elizabeth, Regiane and Regina), with four replications. Harvesting was carried out 30 days after transplanting. The most productive lettuce cultivars were Regiane, which obtained the greatest number of leaves, and Regina with the smallest stem length. The environmental conditions that increased resistance to bolting in the lettuce were the shading and 50% heat-reflective screens. The cultivars themselves showed no significant differences for resistance to bolting.

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Biogenic amines are important indicators of food quality with recognized antioxidant capacity. Diets that are rich in these compounds promote several benefits for human health, although the consumption in excess may result in food poisoning. This study aims to screen the levels of biogenic amines in four colored cauliflowers, before and after cooking (boiling, steaming, and microwaving). In addition, the levels of tryptophan and 5-hydroxytryptophan, two serotonin precursors, were analyzed. Our results reveal that thermal processing shows a tendency to increase tryptophan levels and reduce 5-hydroxytryptophan in colored cauliflowers. A reduction of the tryptophan and increase in serotonin contents in ‘Cheddar’, steamed or microwaved, was observed. A higher level of histamine was observed in the genotype ‘Forata’ after cooking, whereas melatonin levels were higher after steaming and microwaving. The lowest levels of biogenic amines and amino acids were observed in ‘Graffiti’. All the colored cauliflowers that were analyzed presented a chemical quality index (CQI) below the pre-established limits, indicating that are safe for consumption, even after cooking. We conclude that the levels of biogenic amines and amino acids in colored cauliflower are safe for human consumption and do not present health risks. Therefore, the consumption of these genotypes, raw or cooked, is a good source of bioactive compounds.

The effects of diazotrophic bacteria inoculation associated to phosphate fertilization on plant growth and leaf gas exchange parameters in maize plants (Zea mays L.) were investigated in the present study. Maize plants were grown in 13-L pots filled with clayey Rhodic Hapludox in a greenhouse. Treatments were arranged in a randomized block design in a 4 × 2 factorial: four seed inoculation treatments [control (non-inoculated); inoculation with Azospirillum brasilense strain AbV5; inoculation with Herbaspirillum seropedicae strain SmR1; and inoculation with two bacteria strains (A. brasiliense + H. seropedicae)] and two phosphate fertilization levels [no fertilized or fertilized with phosphorus (300 mg dm-3 of P 2 O 5)]. Phosphorus fertilization resulted in higher plant height, stem diameter, number of leaves per plant, leaf area, dry matter yield of leaves, stems and sheaths of maize plants, regardless of seed inoculation with diazotrophic bacteria. Seed inoculation with A. brasilense and H. seropedicae increased in 42% of the volume root, in 52% of the root dry matter and 25% of the plant height of maize, indicating an increase in the phosphorus solubilization or higher phosphorus use provided by the maize root system. Seed inoculation with A. brasilense associated to phosphorus fertilization increased in 23% of the relative chlorophyll content, resulting in higher metabolic structure to the photosynthetic activity of maize plants. The leaf CO 2 assimilation rate was not affected by the phosphorus fertilization and maize seed inoculation with A. brasilense and H. seropedicae.

, with the objective of evaluating the influence of different environments and spacings in the production and tolerance to early bolting of romaine lettuce cultivar Sophia. The experimental design used was a randomized block design in a 2 x 5 factorial design, with two spacings (30 x 30 cm and 25 x 25 cm) and five protected environments (with 30 and 50% shade screens, 30 and 50% thermo-reflective screens and an open field), totaling ten treatments with four replicates each. The plots consisted of four rows with five plants each, totaling twenty plants per plot. The six central plants were considered as useful area for yield evaluation. The plots that used the spacing 30 x 30 cm had 1.8 m 2 each, and the 25 x 25 cm plots had 1.5 m 2 each. Seedlings were transplanted at 26 days and the crop was harvested 46 days after transplanting. The 25 x 25 cm spacing between plants and the open field provided the highest yield of romaine lettuce. However, the time for early bolting of plants in open field was shorter than in environments with shading screens or thermo-reflective screens.Key words: flowering, greenhouse crops, Lactuca sativa spacing, light incidence. O experimento foi conduzido na área experimental da Universidade do Estado de Mato Grosso, localizada no município de Cáceres-MT, no período de maio a agosto de 2011, com o objetivo de avaliar a influência de diferentes ambientes e espaçamentos na produção e tolerância ao pendoamento de alface-romana cultivar Sophia. O delineamento experimental foi em blocos casualizados, arranjados em esquema fatorial 2 x 5, composto por dois espaçamentos (30 x 30 cm e 25 x 25 cm) e cinco ambientes de cultivo (tela de sombreamento 30 e 50% , tela termorrefletora de 30 e 50% e ambiente aberto), perfazendo 10 tratamentos com quatro repetições cada. As parcelas experimentais foram constituídas por quatro linhas, com cinco plantas cada, totalizando 20 plantas por parcela. Consideraram-se como área útil para avaliação da produção as seis plantas centrais. As parcelas em que foi utilizado o espaçamento 30 x 30 cm apresentavam 1,8 m 2 cada, e as com o espaçamento 25 x 25 cm, 1,5 m 2 cada. As mudas foram transplantadas com 26 dias e a colheita realizada aos 46 dias após o transplantio. Observou-se que o espaçamento de 25 x 25 cm entre plantas e o ambiente aberto proporcionaram maior produtividade da alface-romana. Porém, o tempo para pendoamento das plantas no ambiente aberto foi menor que nos ambientes com as telas de sombreamento ou termorrefletora. Palavras-chave:Lactuca sativa, incidência de luz, cultivo protegido, florescimento, espaçamento.

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