Revista Brasileira de Sementes

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List of Papers (Total 50)

Padronização da metodologia do RT-PCR utilizado para identificação do mRNA da alfa-amilase em sementes de milho

During germination the seed reserve carbohydrates are degraded by a-amylase activity. The identification of mRNA is a very important tool for definition of a-amylase synthesis kinetics. This study aimed to adapt a PT-PCR methodology for a-identification of amylase mRNA in germinating maize seeds. After three days germination of Saracura BRS4154 and CATI AL34 maize cultivars, the...

Qualidade fisiológica de sementes de milho-doce BR 400 (bt) em função do teor de água na colheita e da temperatura de secagem

The purpose of the present research was to study the physiological seed quality of sweet corn as a function of water content at harvest time and drying temperatures of the ears. Experiments were made in the Agriculture School of São Paulo State University located in Botucatu, São Paulo, Brazil. Ears of sweet corn cultivar, BR 400 Super Sweet (brittle), were harvested at different...

Qualidade sanitária de sementes de aveia-preta (Avena strigosa Schreb.) produzidas no estado do Rio Grande do Sul, safra 1999/2000

This work aimed to evaluate the health quality of black oat seeds (Avena strigosa Schreb.) produced in the Rio Grande do Sul State, Brazil. 81 seed lots from 16 different countries were evaluated. Blotter test was used based with 400 seeds by lot. The fungi detected in the seeds were: Alternaria sp., Chaetomium sp.,Cladosporium sp., Colletotrichum sp., Curvularia sp., Epicoccum...

Pré-hidratação em sementes de soja e eficiência do teste de condutividade elétrica

The present study aimed to evaluate the influence of pre-hydration on the efficiency of the electrical conductivity test in the evaluation of the physiological potential of soybean seeds. Seeds of six lots of cv. BRS - 231, uniform size retained in the sieve 6,5mm, were submitted to the pre-hydration treatments in saturated atmosphere and in humidified substratum, for 3, 6, 9 and...

Adubação orgânica e mineral na produção de sementes de abobrinha

This study was performed with the objective of verifying the effects of fertilizers on field components and the productive potential of seeds of Cucurbita pepo L. var melopepo cv. Caserta. The experiment was conducted at the Centro Agrícola Demonstrativo da Prefeitura de Porto Alegre during the years 2002/03. The treatments consisted of: T1 = control, T2 = mineral fertilizer and...

Qualidade fisiológicade sementes de Ocotea porosa (Nees et Martius ex. Nees) após diferentes condições de armazenamento e semeadura

The seed moisture level at harvest and the following procedures are very important factors for germination, that will results in the success or failure of plant establishment. The aim of this study was to add information about viability and vigour of Ocotea porosa (imbuia) seeds, such as the right time to harvest, the best storage procedure and how to produce plants inside a...

Longevidade de sementes de mutamba (Guazuma ulmifolia Lam. - Sterculiaceae) no solo em condições naturais

The objective of this research was to evaluate the seed viability of mutamba (G. ulmifolia) at different times of burying and depth in the soil in an induced soil seed bank. A randomized block design was used in a 3 x 3 factorial scheme with four plots. The treatments used were three soils depths (0, 2 and 4cm) and three times (3, 4 and 5 months after burying). Each plot had 500...

Qualidade fisiológica e sanitária de sementes de Feijão-miúdo beneficiadas em mesa gravitacional

The objective of this work was to evaluate the effect of the gravitational table in the sanitary and physiological quality in seeds lots of (Vigna unguiculata (L.) Walp). After the cleanness, seeds of four genotypes (Peanut, Bay, Mosqueado and Preto) had been submitted to the action of the gravity table with discharge divided in three fractions: superior, intermediate and...

Influência da temperatura e da luz na germinação de sementes de couve-cravinho (Porophyllum ruderale (Jacq.) Cass.)

The knowledge of the biology and of the ecology of weeds precede the elaboration of agronomic strategies for weed control, reducing the costs of the productive process. Certain plants, in addition to other biological characteristics of importance, have their germination capacity influenced by abiotic factors such as temperature and brightness. With the objective of evaluating the...

Determinação do grau crítico de umidade em sementes de Cenostigma tocantinum Ducke

Seeds forests longevity studies is important for management with these species. The tree Cenostigma tocantinum Ducke (pau-pretinho), naturally occurs in Amazonia and lately it has been used for arborization in Manaus city. However, the germination and storage seeds behavior of C. tocantinum is not well known. The present study aimed to evaluate the behavior of seeds of C...

Evaluation of lignin content of soybean seed coat stored in a controlled environment

Breeding soybean for high seed quality is an important approach for developing cultivars for tropical regions, and the lignin content in the seed coat is one of the screening parameters for this trait. Considering that many breeding lines are evaluated in each growing season using the presently recommended method for lignin determination, a long period is required for the...

Nodulação e desenvolvimento de plantas oriundas de sementes de soja teores de molibdênio

Molybdenum is supplied to plants mainly through seed treatment, although the use of seeds enriched with Mo is a possible alternative. In the present study nodulation and development of soybean plants derived from seeds of plants that received leaf application of different rates of Mo was evaluated. The Mo was supplied through of leaf applications during the maturation process, in...

Pré-hidratação de sementes de ervilha e sua interferência na avaliação do potencial fisiológico

The objective of the present research was to study biochemical and physiological changes caused by pea seed pre-hydration with emphasis on electrolyte leakage. Seed lots of the cvs. Axé and Maria were characterized for their water content, germination, first germination counting, accelerated aging, electrical conductivity and seedling emergence in the field. The seeds of each lot...

Análise de danos mecânicos e qualidade de sementes de algodoeiro

The objective of the present study was to analyse mechanical damage and its effect on the germination and vigour of cotton seeds. Samples from five lots of cotton seeds were used, of the ITA-90 variety, 2004/05 crop, soon after processing. The seeds were analyzed for percentage of mechanical damage, moisture content, germination and vigour (accelerated ageing, cool germination...

Conservação de sementes de Magnolia ovata St. Hil

The research aimed to study the influence of the seed moisture content and storage temperature on Magnolia ovata (Magnoliaceae) seed conservation, a native Brazilian tree. Thus, recently harvested seeds with moisture content of 23.5% were dried to obtain seed lots with moisture content of 17.4 %, 10.9% and 7.1%. Then, seeds were placed in polyethylene bags and stored at 15ºC and...

Germinação e vigor de sementes de sorgo forrageiro sob estresse hídrico e salino

Salt and water stress during germination affect the emergence of seedlings in the field and, consequently, the stand of the plants and crop growth. Two experiments were conducted to evaluate the effects of water and salt stress on germination and vigor of seeds of two sorghum [Sorghum bicolor (L.) Moench] genotypes. The seeding was done inside "Gerbox" boxes, on two sheets of...

Retardamento de colheita, método de secagem e qualidade de sementes de mamona

It is known that maxim seed quality is reached at physiological maturity, which is the point of maximum dry weight accumulation, seed vigor and germination. The high moisture content in seeds after their maturity until harvest can accelerate the seed deterioration process, due to high metabolic activity. The objective of this study was to evaluate harvest time with natural and...

Pré-esfriamento para superação da dormência de sementes de trigo colhidas na época da maturidade

The wheat breeding program has generated an expressive number of cultivars which differ in sprouting rate of seed still attached to the spike. In order to assess these differences, an experiment was carried out with seeds harvested from two locations, Palotina and Cascavel, in Paraná State, Brazil, consisting of twelve cultivars in a randomized block design with four replications...

Qualidade fisiológica e potencial de armazenamento de sementes de carambola

This study was conducted to determine the physiological quality of carambola seeds convectively dried at 38 ºC, at the end of germination tests in paper rolls and lasting 84 days. Seed storability using two types of packaging, water vapour permeable and impermeable, under two storage conditions, ambient at 25 ºC and 61% relative humidity, and inside a 10 ºC refrigerated chamber...

Lolium Multiflorum seeds in the soil: II. Longevity under natural conditions

The interest was the seed longevity dynamics of annual ryegrass in natural conditions as an important tool to explain its dynamics in no tillage systems used in the South of Brazil. The species is commonly managed for natural re-sowing and, in this way, allows cattle grazing with reduced costs during the winter time. In February of 2003, twenty bags of nylon screen containing...

Germinação e armazenamento de sementes de Albizia hasslerii (Chod.) Burkart.

The objective of this work was to to evaluate the influence of the temperatures and the pre-germinatives treatments in germination of seeds of Albizia hasslerii. Two experiments had been carried out. In the first experiment the seeds had received the following pre-germinative treatments: immersion in H2SO4 per 10 minutes, H2SO4 per 20 minutes, GA3 150 mg. L-1 for 24 hours and the...

Conservação de sementes de ipê-amarelo (Tabebuia chrysotricha (Mart. ex A. DC.) standl.) em função do teor de água das sementes e da temperatura do armazenamento

Tabebuia chrysotricha (Mart. ex A. DC.) Standl. is a tree species of high ecological, economical and landscape value. Its seeds present significant variation in quality during storage, which hampers the development of propagation techniques. The objective of this research was, through variations in seed water content and environment temperature, to study the physiological...

Changes in gene expression during drying and imbibition of desiccation sensitive Magnolia ovata (A. St.-Hil.) spreng. seeds

Seeds of Magnolia ovata were dried to different water contents to assess the viability and transcript abundance of genes related to seed development, cell cycle, cytoskeleton and desiccation tolerance.The expression of development, cell cycle and cytoskeleton relative genes (ABI3, CDC2-like and ACT2) alone could not explain the germination behaviour of M. ovata seeds in relation...

Dormência e armazenabilidade de sementes de capim-gordura

The African grass species, Melinis minutiflora, which was an important forage species in the Brazilian Cerrado region for around two centuries, is nowadays considered an important weed in this region. The present study aimed to evaluate seed dormancy and viability during storage, aspects that could affect species dissemination. Seeds of the cultivars Roxo and Cabelo-de-Negro...

Condicionamento fisiológico de sementes de pepino e germinação sob diferentes temperaturas

Seed priming is a technique that involves the controlled hydration of seeds and has beneficial effects such as increased velocity and uniformity of seedling emergence and increased seed tolerance to unfavorable environmental conditions. We defined procedures for seed priming and verified seed performance at different temperatures using seed lots of C. Sativus cultivars Safira and...