Resposta de sementes de &lt;i&gt;Podocarpus lambertii &lt;/i&gt;e &lt;i&gt;Podocarpus sellowii&lt;/i&gt; – (Podocarpaceae) à dessecação.

Garcia, Lucinda Carneiro; Nogueira, Antônio Carlos

doi:10.5902/19805098446

Cited by 2 publications

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“…Moreover, soil moisture can accelerate and standardize the seed germination process. Podocarpus lambertii has orthodox seeds, which remain viable after dehydration (Garcia and Nogueira 2008); however, orthodox seeds lose tolerance to desiccation in the early stages, but when rehydrated, they maintain their physiological functions influencing the germination process (Guimarães et al 2011). In addition to altering soil moisture and structure, forest patches normally enhance soil nutrients (C, N, P, and cations; Scholes and Archer 1997).…”

Section: Importance Of Forest Patches To P Lambertiimentioning

confidence: 99%

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

et al. 2019

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The grasslands conversion to forests is occurring globally and modifying the population dynamics of species. Here, we characterized the population dynamics of Podocarpus lambertii Klotzsch ex Endl. over four years in southern Brazilian forest–grassland mosaics. We asked (i) if the studied P. lambertii population would decrease or increase over time and (ii) what the role of forest patches is in the growth and recruitment of a P. lambertii population. Thus, we studied forest–grassland mosaics, stratified the population into four demographic classes, evaluated the population dynamics, and estimated the correlation between canopy cover and average number of individuals. All individuals of P. Lambertii occurred in forest patches. Density was high but decreased from seedlings to the reproductive stage. The population growth rate was λ = 1.025, and the recruitment of individuals was high and variable among years. The transition and mortality rates showed a pattern of reduction from seedlings to the reproductive stage. Mortality rate for seedlings and juveniles was low and concentrated at the smaller heights. The correlations between canopy cover and the average number of individuals were positive and significant. The ecological characteristics of this species and specific conditions provided by forest patches allow population growth and species conservation in the southern Brazilian forest–grassland mosaics.

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Section: Importance Of Forest Patches To P Lambertiimentioning

confidence: 99%

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

et al. 2019

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The influence of drying on the physiological quality of crambe fruits

et al. 2012

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ABSTRACT. This study was performed to evaluate the physiological quality of Crambe abyssinica Hochst fruits subjected to drying under different treatments with air. The crambe fruits, with moisture content of 21.0 ± 1.3 (% w.b.), were manually collected and dried until their moisture content reached 7.0 ± 1.4 (% w.b.). The crambe fruits were dried with natural air (23°C mean temperature and 60.6% average relative humidity) and seven days after harvest in an experimental dryer with forced ventilation at temperatures of 30, 40, 50, 60 and 70°C and relative humidities of 37.4, 22.3, 14.0, 8.3 and 5.1%, respectively. The evaluation was the percent germination, the germination speed index (GSI), the amount of water absorption and the electrical conductivity. The results of the study showed that increases in the drying temperature decreased the drying time and negatively affected the quality of the fruits. The study's findings for the GSI and for the percent germination showed that the drying temperature of 30°C yielded superior results. The moisture content of the crambe fruits after absorption was higher at the drying temperatures of 23, 40 and 70ºC. In contrast, the electrical conductivity measurement was unaffected by drying at high temperatures.Keywords: oilseed, temperature, Crambe abyssinica Hochst. Influência da secagem na qualidade fisiológica dos frutos de crambeRESUMO. Objetivou-se avaliar a qualidade fisiológica dos frutos de Crambe abissynica, submetidas à secagem em diversas condições de ar. Frutos de crambe foram colhidos manualmente com teor de água de 21,0 ± 1,3 (% b.u) e secas até o teor de 7,0 ± 1,4 (% b.u.). A secagem foi realizada com ar natural (temperatura média de 23ºC e umidade relativa média de 60,6%) e sete dias após a colheita em secador experimental nas temperaturas de 30, 40, 50, 60 e 70°C e umidades relativas de 37,4; 22,3; 14,0; 8,3 e 5,1% respectivamente. A qualidade dos frutos foi avaliada pela porcentagem de germinação, índice de velocidade de germinação (IVG), absorção de água e condutividade elétrica. Com o aumento da temperatura o tempo de secagem reduziu e a qualidade dos frutos foi influenciada negativamente. Para a temperatura de 30ºC o IVG e a porcentagem de germinação foram superiores às demais temperaturas avaliadas. O teor de água dos frutos de crambe depois da absorção de água foi mais elevado para as temperaturas de secagem de 23, 40 e 70ºC. A secagem em temperaturas elevadas não influenciou a condutividade elétrica.Palavras-chave: semente oleaginosa, temperatura, Crambe abissynica Hochst.

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Resposta de sementes de <i>Podocarpus lambertii </i>e <i>Podocarpus sellowii</i> – (Podocarpaceae) à dessecação.

Cited by 2 publications

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Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

Population dynamics of Podocarpus lambertii in southern Brazilian forest–grassland mosaics

The influence of drying on the physiological quality of crambe fruits

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