Aclimatação ao frio e dano por geada em canola

Dalmago, Genei Antônio; Cunha, G. R. da; Santi, Anderson; Pires, J. L. F.; Müller, Alexandre Luiz; Bolis, Laise Maria

doi:10.1590/s0100-204x2010000900001

Cited by 20 publications

(22 citation statements)

References 17 publications

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“…Com a semeadura em 13/5/2010, ocorreu redução no subperíodo emergência-formação de roseta em cerca de 8 e 16 dias, comparativamente às semeaduras de 29/4/2010 e 3/6/2010, respectivamente, e uma ampliação de 7 a 9 dias para o subperíodo formação de roseta-início do florescimento. A mudança observada na fenologia é um indicativo de influência de outros fatores ambientais no desenvolvimento da canola, como: regime de temperatura diurno/ noturno (Cutforth et al, 1992), baixa temperatura do ar (Bartholomew & Williams, 2006) e diferenças na aclimatação (Dalmago et al, 2010).…”

Section: Resultsunclassified

Filocrono e número de folhas da canola em diferentes condições ambientais

Dalmago

Fochesatto²,

Kovaleski

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar o número de folhas e o filocrono de genótipos de canola, em resposta a variações térmicas associadas com datas de semeadura. Foram realizados dois experimentos, em delineamento de blocos ao acaso, com arranjo fatorial de genótipos por datas de semeadura (5x2, em 2009, e 2x3 em 2010) e quatro repetições. O número de folhas do caule principal e do primeiro ramo foi determinado três vezes por semana. O filocrono foi estimado pelo inverso do coeficiente angular entre a soma térmica e o número de folhas, para os subperíodos da roseta e do alongamento do caule. O número de folhas no caule variou de 11,5 a 16,4; nos ramos, este número foi, em média, 70% menor. O número de folhas no caule foi maior em semeaduras precoces, e o inverso ocorreu no ramo. O filocrono foi maior no subperíodo da roseta e variou entre 21,4 e 52,9 graus-dia por folha conforme o genótipo e a data de semeadura. Semeaduras tardias aumentaram o filocrono. Genótipos de ciclo precoce apresentam número de folhas e filocrono menores que genótipos de ciclo médio ou longo, e a variabilidade entre os genótipos acentua-se em semeaduras tardias.Termos para indexação: Brassica napus, Brassica juncea, colza, emissão de folhas, fenologia, soma térmica. Phyllochron and number of leaves of canola in different environmental conditionsAbstract -The objective of this work was to determine the number of leaves and phyllochron of canola genotypes, in response to thermal variations associated with sowing dates. Two experiments were conducted in a randomized block design, with a factorial arrangement of genotype by sowing date (5x2, in 2009, and 2x3 in 2010), and four replicates. The number of leaves on the main stem and first branch was determined threefold a week. Phyllochron was estimated by the inverse of the slope between the thermal time and the number of leaves, at the rosette stage and at stem elongation. The number of leaves on the main stem ranged from 11.5 to 16.4; this number was on average 70% lower in the first segment. The number of leaves on the main stem was higher in early sowing, and the opposite occurred in the first segment. The phyllochron was higher in the rosette stage, and values ranged from 21.4 to 52.9 degree-days per leaf, according to genotypes and sowing dates. Late sowing dates increased the phyllochron. Early genotypes have lower number of leaves and phyllochron than medium and late genotypes, and the variability between them increase in late sowings.

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Section: Resultsunclassified

Filocrono e número de folhas da canola em diferentes condições ambientais

Dalmago

Fochesatto²,

Kovaleski

et al. 2013

Pesq. agropec. bras.

Self Cite

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“…Dalmago et al (2010) highlighted that there is heterogeneity of responses of the canola yield according to the environment. Thus, it is suggested that the higher numbers of the surface area of the hybrids in Guarapuava are due to the environmental conditions, which may be propitious for the canola, favoring a better development of the yield.…”

Section: Characterization Of Root System Growthmentioning

confidence: 99%

Root growth and productivity of conventional and herbicide-tolerant canola in contrasting environments

Mattioni¹,

Caverzan²,

Sozo³

et al. 2017

Aust J Crop Sci

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The canola (Brassica napus L. oil variant) is considered as a winter crop alternative in south Brazil. Thus, the aim of this study was to compare the root growth and the productivity components of hybrid grains of conventional and herbicide tolerant canola in different localities. The experiments were conducted in the municipality of Passo Fundo, Rio Grande do Sul state and Guarapuava, Paraná state, Brazil. The randomized block design with four replication was used. The genotypes evaluated were: Hyola 61 and H92002 (conventional), Hyola 571 CL and K10050 (imidazolinone-resistant), and Hyola 751 TT (triazine-resistant). In order to evaluate the root system, soil monolith were collected and image analysis measuring the superficial area and the total root volume of the sample in diameter classes, root density and specific surface area were done. The grains productivity components and the number of branches in the plant were measured through the number of siliques in the branches. The productivity of the grains and the thousand grain mass were measured as well. The canola hybrid presented higher root length, surface area and volume in the diameter scale between 1 and 5 mm of density. In addition, there were variations in the growth of roots and grain productivity in different environments, in which imidazolinone-tolerant hybrids presented higher development of the roots, as well as, higher grain productivity in the different environment studied.

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“…The hybrids Hyola 76 and Hyola 433, when sown on 05/10/2011, had superior performance compared to sowing on 04/08/2011 (comparing the sowing dates). According to Dalmago (2010) and Zhang et al (2015), it is plausible to suggest that these results are due to conditions of lower temperature occurred since the start of cycle until harvest (Table 1).…”

Section: Accelerated Agingmentioning

confidence: 99%