Cold and freeze stress at flowering Effects on seed yields in winter rapeseed

Lardon, A.; Triboï‐Blondel, Anne‐Marie

doi:10.1016/0378-4290(95)00052-6

Cited by 25 publications

(18 citation statements)

References 7 publications

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“…No início do florescimento (E3), as plantas estão mais predispostas a danos, pois este é o momento de ocorrência de processos mais sensíveis à geada (Lardon & Triboi-Blondel, 1995 No experimento 4, houve interação significativa entre os tratamentos. A queima de folhas começou a ocorrer a partir da geada a -2°C, e o dano aumentou progressivamente até a geada a -6°C, nos tratamentos A3 e A4 (Tabela 4).…”

Section: Resultsunclassified

Aclimatação ao frio e dano por geada em canola

Dalmago

Cunha

Santi

et al. 2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a influência da aclimatação ao frio sobre o dano causado pela geada em diferentes estádios fenológicos de genótipos de canola. Foram realizados cinco experimentos em ambiente controlado, em 2006, 2007 e 2008. Os fatores avaliados foram: genótipos, aclimatação (com; sem), intensidades de geada, estádios de desenvolvimento de plantas, regimes de aclimatação e regimes de geada. As variáveis avaliadas foram: queima de folhas, massa de matéria seca, estatura de plantas, duração de subperíodo, componentes de rendimento e rendimento de grãos. A aclimatação ao frio, antes da geada, resultou em menor queima de folhas e maior massa de matéria seca, em comparação a plantas não aclimatadas. As geadas foram prejudiciais a partir de -6°C no início do ciclo de desenvolvimento, principalmente em plantas não aclimatadas, e a partir de -4ºC na floração, com redução do número de síliquas e do número de grãos por síliqua. A aclimatação após as geadas não contribuiu para a tolerância da canola a esse evento. Geadas consecutivas não acarretaram maior prejuízo à canola. A aclimatação de plantas de canola antes da geada reduz os danos, principalmente quando a geada ocorre no início do desenvolvimento das plantas.Termos para indexação: Brassica napus, estresse térmico, temperatura baixa, tolerância ao frio. Acclimatization to cold and frost-injury in canolaAbstract -The objective of this work was to evaluate the influence of cold acclimatization on frost damage at different phenological stages of canola genotypes. Five experiments were carried out under controlled conditions, in 2006, 2007, and 2008. The evaluated factors were: genotypes, acclimatization (with; without), frost gradient, plant developmental stages, acclimatization regimes and frost regimes. The evaluated variables were: leaf scorching symptoms, dry weight, plant height, length of subperiod, yield components and grain yield. The acclimatization before frost resulted in lesser leaf scorching symptoms and higher dry matter in comparison to plants not acclimated. Frosts were harmful from -6°C in early plant development stage, mainly in nonacclimated plants, and from -4ºC at flowering, reducing the number of pods and the number of grains per pod. Acclimatization after frost did not contribute to the tolerance of canola to frost. Consecutive frosts caused no greater impairment to canola. The canola acclimatization before frost reduces damage caused by it, mainly when the frost occur in the initial plant development stages.

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Section: Resultsunclassified

Aclimatação ao frio e dano por geada em canola

Dalmago

Cunha

Santi

et al. 2010

Pesq. agropec. bras.

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“…Flowering is the most critical stage of rapeseed development, because of the decrease in the total leaf area and reduced photosynthesis [20,21]. Frost at the beginning of the flowering increases branching, and the flowering lasts longer, resulting in an increased number of poorly filled pods, formed on the lower branches [22,23]. If the post-flowering period is water limited, the yield will be low, as canopy transpiration cannot be met [24].…”

Section: Introductionmentioning

confidence: 99%

Dissection of Year Related Climatic Variables and Their Effect on Winter Rapeseed (Brassica Napus L.) Development and Yield

Marjanović-Jeromela

Terzić

Jankulovska³

et al. 2019

Agronomy

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Winter oilseed rape (WOSR) production is dependent on weather conditions, but is also characterized by low nitrogen (N) use efficiency. The objectives of this study were to: (i) evaluate sources of variability for the seed yield and oil content of four rapeseed cultivars under the influence of three sowing dates (SD trial) and five nitrogen dosages (N trial) during four growing seasons; (ii) understand year-related interactions and the effect of climatic variables in different growth stages; and (iii) assess the presence of interactions cultivar by year (C × Y) and treatment by year (T × Y). Six climatic factors were observed, during germination, overwintering, budding, flowering and ripening. The mixed effect split-plot analysis of variance was used, as well as factorial regression models. The C × Y interaction was the most important for the oil content in both trials. The precipitation at budding stage (75.8%), relative air humidity at overwintering (63.3%) and flowering stage (53.0%) accounted for the highest proportion of T × Y interaction for the seed yield, as well as precipitation at flowering (92.0%) and ripening (85.0%) for the oil content. Water availability was the main determinant of the seed yield and/or oil content accompanied with cooler temperatures during the seed development. The study successfully dissected the effect of year-related climatic variables on the agronomical traits in winter rapeseed. Based on this, appropriate agronomic practices can be applied at specific growing stages to ensure a high seed and oil yield.

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“…Thanks to its plasticity, branching is often involved in the response of plants to environmental constraints, and notably to flower damage (Sadras, 1996 ; Tiffin, 2000 ). In WOSR, floral bud damage may be due to pests (Lerin, 1987 ; Brandt and Lamb, 1994 ; Nilsson, 1994 ) or environmental constraints (Morrison, 1993 ; Lardon and Triboi-Blondel, 1995 ; Annisa et al, 2013 ) and can cause potentially dramatic yield losses. In particular, before flowering, WOSR plants may undergo massive floral bud losses due to pollen stealing by pollen beetles ( Meligethes aeneus L—Lerin, 1987 ).…”

Section: Introductionmentioning

confidence: 99%

Floral bud damage compensation by branching and biomass allocation in genotypes of Brassica napus with different architecture and branching potential

2015

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Plant branching is a key process in the yield elaboration of winter oilseed rape (WOSR). It is also involved in plant tolerance to flower damage because it allows the setting of new fertile inflorescences. Here we characterize the changes in the branching and distribution of the number of pods between primary and secondary inflorescences in response to floral bud clippings. Then we investigate the impacts of the modifications in branching on the biomass allocation and its consequence on the crop productivity (harvest index). These issues were addressed on plants with contrasted architecture and branching potential, using three genotypes (Exocet, Pollen, and Gamin) grown under two levels of nitrogen fertilization. Clipping treatments of increasing intensities were applied to either inflorescences or flower buds. We were able to show that restoration of the number of pods after clipping is the main lever for the compensation. Genotypes presented different behaviors in branching and biomass allocation as a function of clipping treatments. The number of fertile ramifications increased for the high intensities of clipping. In particular, the growth of secondary ramifications carried by branches developed before clipping has been observed. The proportions of yield and of number of pods carried by these secondary axes increased and became almost equivalent to the proportion carried by primary inflorescences. In terms of biomass allocation, variations have also been evidenced in the relationship between pod dry mass on a given axis and the number of pods set, while the shoot/root ratio was not modified. The harvest index presented different responses: it decreased after flower buds clipping, while it was maintained after the clipping of the whole inflorescences. The results are discussed relative to their implications regarding the identification of interesting traits to be target in breeding programs in order to improve WOSR tolerance.

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Cold and freeze stress at flowering Effects on seed yields in winter rapeseed

Cited by 25 publications

References 7 publications

Aclimatação ao frio e dano por geada em canola

Aclimatação ao frio e dano por geada em canola

Dissection of Year Related Climatic Variables and Their Effect on Winter Rapeseed (Brassica Napus L.) Development and Yield

Floral bud damage compensation by branching and biomass allocation in genotypes of Brassica napus with different architecture and branching potential

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