Efeito das geadas em culturas energéticas

Perissato, Samara Moreira; Marcelino, Wesler Luiz; Acco, Laura Feuser; Cabral, Ana Claudia; Pinto, Luana Patrícia; Frigo, Jianice Pires

doi:10.5380/rber.v2i4.35793

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…For each plant species there is a temperature at which protoplasm freezing will occur and may occur before the air temperature reaches 0°C. Some species may have a higher resistance to freezing, remaining alive even after the phenomenon has occurred, but mortality may occur in younger tissues, such as the apex (Perissato et al 2013). Kreyling et al (2015) observed a cold tolerance of up to -9.2°C for Sequoia sempervirens.…”

Section: Discussionmentioning

confidence: 99%

Impacts of genetic selection on Sequoia sempervirens mini-cutting rooting and initial growth in the field

Lovatel

Rosa

Sá

et al. 2021

NZJFS

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Background: Vegetative propagation from superior individuals allows multiple copies of plants that are genetically identical to the parent plant to be obtained. However, vegetative propagation success varies among individual genotypes, with some clones having more difficulty forming roots than others. The aim of this study was to evaluate the genetic gain in Sequoia sempervirens (D.Don) Endl. clones using parameters describing vegetative propagation success and initial growth in field. Methods: Vegetative propagation success was quantified for 16 clones in a completely randomised design consisting of 10 replications, each containing 10 mini-cuttings. At 90 days, rooting (RT), survival (SV) and the number of new shoots (NS) were evaluated. Performance after planting in the field was assessed using 13 clones from the previous experiment, arranged in linear parcels of 10 plants with 8 replicates. After 18 months, survival (SV), stem diameter (SD), height (H) and dominance breakdown (DB) were assessed. Estimates of variance components, heritability and genetic correlations were obtained using the Selegen-REML/BLUP software. Results: The mini cuttings of the 16 clones had a coefficient of genetic variation (CVgi%) of 32.32% for RT, 5.44% for SV and 5.35% for NS. The heritability of the total genetic effects (H2 g) for RT was 0.68. The clones with the best predicted genotypic classifications for the characteristics evaluated in the field were A116, A140 and A138 for SV, A126, A140 and A138 for SD, A138, A140 and A117 for H and A138, A228 and A116 for DB. Conclusions: In general, it was possible to obtain high genetic gain for rooting and medium gain for dendrometric variables in the field.

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Section: Discussionmentioning

confidence: 99%

Impacts of genetic selection on Sequoia sempervirens mini-cutting rooting and initial growth in the field

Lovatel

Rosa

Sá

et al. 2021

NZJFS

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“…Owing to the large impact that frosts have upon the agriculture, numerous scientific studies have centred on addressing the damage caused by this phenomenon to: coffee (Androcioli Filho and Caramori, 2000), peaches (Szewczuk et al, 2007), sugar cane (Monteiro and Sentelhas, 2014), corn (Carter, 1995), beans (Meyer and Badaruddin, 2001), apples (Eccel et al, 2009), vines (Brixner et al, 2014) and canola (Perissato et al, 2013), among other crops. Minimizing frost damage can be done by taking preventive measures (passive protection) or by acting during the frost (Snyder and de Melo-Abreu, 2005).…”

Section: Introductionmentioning

confidence: 99%

Development of an index for frost prediction: Technique and validation

Rozante

Gutierrez

Dias

et al. 2019

Meteorological Applications

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An index for frost prediction is proposed and calibrated against observations. It takes into account: (1) the main meteorological variables that favour or oppose to frost; (2) weights attributed to these variables; and (3) means and standard deviations of these variables, only for cases in which frost occurs, as defined by observation of temperatures that are ≤ 6°C. The meteorological variables used for the frost index IG (from the Portuguese, Índice de Geada) are numerically predicted by a regional weather forecast model. An outcome of the calibration processes results is that temperature has the largest contribution, followed by pressure and winds, while the other variables were adjusted to obey the restriction that the sum of weights are equal to 1. After index calibration and threshold determination, the method was applied for the 2017 winter season, and a case study for May 2018 was also considered. In order to verify whether the new index can satisfactorily contribute to the weather forecasting, the results using the IG were compared with the temperature outputs of the numerical regional model. It was found that for three selected areas, and for all the forecasted hours, the IG produces better results than the model's direct temperature forecasts. Thus, it was concluded that the use of the IG in an operational environment potentially provides considerable improvement in the predictive skill of frost events.

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Efeito das geadas em culturas energéticas

Cited by 2 publications

References 8 publications

Impacts of genetic selection on Sequoia sempervirens mini-cutting rooting and initial growth in the field

Impacts of genetic selection on Sequoia sempervirens mini-cutting rooting and initial growth in the field

Development of an index for frost prediction: Technique and validation

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