Effect of sowing date on rates of leaf appearance, final leaf numbers and areas in Brassica campestris, B. juncea, B. napus and B. carinata

Nanda, R.; Bhargava, S. C.; Rawson, HM

doi:10.1016/0378-4290(95)00026-m

Cited by 32 publications

(18 citation statements)

References 27 publications

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“…Phenological development is driven by temperature and by photoperiod: a short photoperiod is associated with reduced peak radiation, reduced daily radiation, lower mean temperature, and lower minimum temperature. Of these, low minimum temperature would advance phenology in thermal time, whereas both short photoperiod and low radiation could have the reverse effect of slowing phenological development in Brassica species (26). Although a period of 3 months was considered, the harvesting time did not have a relevant effect on fresh weight in any of the samples.…”

Section: Resultsmentioning

confidence: 99%

Multivariate Analysis of Tronchuda Cabbage (Brassica oleracea L. var. costata DC) Phenolics: Influence of Fertilizers

Sousa

Pereira²,

Pereira³

et al. 2008

J. Agric. Food Chem.

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A field experiment was carried out to investigate the effect of fertilization level on the phenolic composition of tronchuda cabbage (Brassica oleracea L. var. costata DC) external and internal leaves. Eight different plots were constituted: a control without fertilization, one with organic matter, and six experiments with conventional fertilizers (nitrogen, boron, and sulfur, two levels each). The phenolic compounds were analyzed by reversed-phase HPLC-DAD. External and internal leaves revealed distinct qualitative composition. In the internal leaves were found 15 phenolics (5 kaempferol and 10 cinnamic acid derivatives), whereas the external leaves presented 3-p-coumaroylquinic acid and 13 kaempferol derivatives. Principal component analysis (PCA) was applied to assess the relationships between phenolic compounds, agronomical practices, and harvesting time. Samples obtained with conventional practices were quite effectively separated from organic samples, for both types of leaves. In general, samples developed without any fertilization presented the highest phenolics amounts: external and internal leaves contained 1.4-and 4.6-fold more phenolic compounds than the ones that received conventional fertilizer, respectively, and the internal leaves presented 2.4 times more phenolics than the ones grown with organic amendment. Additionally, samples from organic production exhibited higher total phenolics content than those from conventional practices, collected at the same time. Samples harvested first were revealed to be distinct from the ones collected later. The results show that it is possible to grow tronchuda cabbage without excess fertilizers, with highest amounts of phenolics and reduced environment contamination.

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Section: Resultsmentioning

confidence: 99%

Multivariate Analysis of Tronchuda Cabbage (Brassica oleracea L. var. costata DC) Phenolics: Influence of Fertilizers

Sousa

Pereira²,

Pereira³

et al. 2008

J. Agric. Food Chem.

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“…Esse tipo de resposta está de acordo com Gomez & Miralles (2011), que observaram redução de duas folhas em razão do aumento em seis horas no fotoperíodo, entre a emergência e o florescimento. A redução no número de folhas com o atraso da semeadura, sob fotoperíodo longo e baixas temperatura do ar, também foi observada por Nanda et al (1995). O aumento do fotoperíodo induz o florescimento e causa redução na TEF (Nanda et al, 1996) (Burton et al, 2008).…”

Section: Resultsunclassified

“…Porém, o filocrono de 50 graus-dia por folha é o utilizado com mais frequência, normalmente como valor único para os diferentes subperíodos fenológicos da canola (Morrison & McVetty, 1991;Nanda et al, 1995). Resultados recentes mostram que o filocrono em canola varia conforme a ontogenia da cultura, e essa variação está mais associada a modificações na morfologia das folhas do que a estádios fenológicos específicos (Gomez & Miralles, 2011).…”

Section: Introductionunclassified

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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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“…At the individual plant scale, the leaf appearance rate is a key factor of this development because it drives the settings of the number of leaves that is highly correlated to the leaf surface at the crop scale (Nanda, Bhargava & Rawson 1995) and in ne to the crop yield (Morrison & Mcvetty 1991;Diepenbrock 2000). Recent works have shown that leaf appearance rate may also vary highly with plant-plant competition within the crop (Baey & Cournède 2011) and explains an important part of the leaf surface variability under high pressure of competition far before the variation in the individual leaf surface (Baldissera, Frak, de Faccio Carvalho P.C.…”

Section: Introductionmentioning

confidence: 99%

Change-Point Estimation in the Multivariate Model Taking into Account the Dependence: Application to the Vegetative Development of Oilseed Rape

Brault

Lévy‐Leduc

Mathieu

et al. 2018

JABES

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Effect of sowing date on rates of leaf appearance, final leaf numbers and areas in Brassica campestris, B. juncea, B. napus and B. carinata

Cited by 32 publications

References 27 publications

Multivariate Analysis of Tronchuda Cabbage (Brassica oleracea L. var. costata DC) Phenolics: Influence of Fertilizers

Multivariate Analysis of Tronchuda Cabbage (Brassica oleracea L. var. costata DC) Phenolics: Influence of Fertilizers

Filocrono e número de folhas da canola em diferentes condições ambientais

Change-Point Estimation in the Multivariate Model Taking into Account the Dependence: Application to the Vegetative Development of Oilseed Rape

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