Photoperiod, light, and temperature requirements to control plant architecture and flowering time in<i>Salvia exserta</i>

Mata, Diego Alejandro; Botto, Javier Francisco

doi:10.1080/14620316.2011.11512782

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…However, such a proposition needs testing in a dedicated factorial experiment in which the red:far-red ratio of the plant and the bud is varied independently. Furthermore, studies on the effects of light intensity on budbreak also changed light intensity on the whole plant (e.g., Mata and Botto, 2011;Schoellhorn et al, 1996;Su et al, 2011;Zieslin and Mor, 1990). Our study reveals that when light intensity and red:far-red ratio received by the plant are similar but differ at bud level, Fig.…”

Section: Discussionsupporting

confidence: 49%

“…Comparing between rose crops illuminated with fluorescent lamps [F (no far-red light)] and a mixture of fluorescent and incandescent light {F+I [red:far-red ratio 0.64, both treatments having equal amount of photosynthetic active radiation (PAR)]}, Mor and Halevy (1984) found less budbreak of the lowest positioned bud on a shoot remainder under F+I compared with F. Similar spectral results were found in other studies on roses (Zieslin and Mor, 1990). Also in other plant species, light level and spectrum affect budbreak of plants [e.g., Arabidopsis thaliana (Finlayson et al, 2010;Su et al, 2011), Poaceae species (Belesky et al, 2011;Evers et al, 2006)], and ornamental crops (Mata and Botto, 2011), but the effects are not present in all plant species (e.g., Crotser et al, 2003;Kawamura and Takeda, 2002). Mor and Halevy (1984) suggested that the inhibitory effect of shoots on axillary budbreak is related to the low red:far-red ratio reaching the buds rather than to low light intensity.…”

supporting

confidence: 63%

“…In their case, the whole crop was subjected to low red:far-red ratio, whereas in our study, only the shoot remainders experienced low red:far-red ratios. Also experiments with other plant species where effects of light spectrum on budbreak or branching were observed often changed light spectrum for the whole plant (e.g., Clifford et al, 2004;Crotser et al, 2003;Mata and Botto, 2011). Our research focused on the effect of light received by the bud, because light on the bud is necessary for the bud to break (Girault et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

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Axillary Budbreak in a Cut Rose Crop as Influenced by Light Intensity and Red:far-red Ratio at Bud Level

Wubs

Heuvelink

Marcelis

et al. 2014

J. Amer. Soc. Hort. Sci.

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When flower-bearing shoots in cut rose (Rosa ×hybrida) are harvested, a varying number of repressed axillary buds on the shoot remainder start to grow into new shoots (budbreak). Earlier experiments indicated that light reaching the bud affected the number of budbreaks. In all these studies, whole plants were illuminated with different light intensities or light spectra. The aim of this article is to disentangle the effects of light intensity and light spectrum, in this case red:far-red ratio, at the level of the buds on budbreak in a rose crop. Three experiments were conducted in which light intensity and red:far-red ratio at the level of the buds were independently varied, whereas intensity and red:far-red ratio of incident light on the crop were not changed. Light intensity and red:far-red ratio at the position of the buds were quantified and related to budbreak on the shoot remainders. Removal of vertical shoots increased light intensity and red:far-red ratio as well as budbreak (1.9 budbreaks per shoot remainder compared with 0.4 budbreaks when five vertical shoots were present). No vertical shoots and red light-absorbing shading paper over the plant base mimicked the effect of vertical shoots with respect to light intensity and red:far-red ratio, but budbreak (1.0 budbreaks) was intermediate compared with treatments with and without shoots. This suggested that the presence of shoots exerts an inhibiting effect on budbreak through both effects on light at the bud and correlative inhibition. When plants had no vertical shoots and light intensity and red:far-red ratio at bud level were changed by neutral and red light-absorbing shading paper, there was a positive effect of light intensity on budbreak (0.3 more budbreaks per shoot remainder) and no effect of red:far-red ratio. Combinations of high and low light intensity with high and low red:far-red ratio on axillary buds showed that there was a positive effect of light intensity on budbreak (0.5 more budbreaks per shoot remainder) and no effect of red:far-red ratio. Our study reveals that when light intensity and red:far-red ratio received by the plant are similar but differ at bud level, budbreak was affected by light intensity and not by red:far-red ratio.

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Section: Discussionsupporting

confidence: 49%

supporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

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Axillary Budbreak in a Cut Rose Crop as Influenced by Light Intensity and Red:far-red Ratio at Bud Level

Wubs

Heuvelink

Marcelis

et al. 2014

J. Amer. Soc. Hort. Sci.

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“…S1). The Solatrol filter has been previously used and increased significantly the R/FR ratio reaching the plants (Mata and Botto , ). Three plots for each light treatment and experiment were established.…”

Section: Methodsmentioning

confidence: 99%

Physiological responses of spring rapeseed (Brassica napus) to red/far‐red ratios and irradiance during pre‐ and post‐flowering stages

Rondanini

Vilariño

Roberts

et al. 2014

Physiologia Plantarum

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Early shade signals promote the shade avoidance syndrome (SAS) which causes, among others, petiole and shoot elongation and upward leaf position. In spite of its relevance, these photomorphogenic responses have not been deeply studied in rapeseed (Brassica napus). In contrast to other crops like maize and wheat, rapeseed has a complex developmental phenotypic pattern as it evolves from an initial rosette to the main stem elongation and an indeterminate growth of floral raceme. In this work, we analyzed (1) morphological and physiological responses at individual level due to low red/far-red (R/FR) ratio during plant development, and (2) changes in biomass allocation, grain yield and composition at crop level in response to high R/FR ratio and low irradiance in two modern spring rapeseed genotypes. We carried out pot and field experiments modifying R/FR ratios and irradiance at vegetative or reproductive stages. In pot experiments, low R/FR ratio increased the petiole and lamina length, upward leaf position and also accelerated leaf senescence. Furthermore, low R/FR ratio reduced main floral raceme and increased floral branching with higher remobilization of soluble carbohydrates from the stems. In field experiments, low irradiance during post-flowering reduced grain yield, harvest index and grain oil content, and high R/FR ratio reaching the crop partially alleviated such effects. We conclude that photomorphogenic signals are integrated early during the vegetative growth, and irradiance has stronger effects than R/FR signals at rapeseed crop level.

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“…Similar reports exist for species other than rose. Both higher red:far-red ratio and higher light intensity increased tiller production in Triticum aestivum (Evers et al, 2006), shoot production in Salvia exserta (Mata and Botto, 2011), and budbreak in wild-type Arabidopsis (Finlayson et al, 2010;Su et al, 2011). However, in most work regarding the effect of light intensity and light spectrum on budbreak, the light on the whole crop is changed, whereas the effect might be different when only the light intensity and/or spectrum on the bud itself is considered.…”

mentioning

confidence: 99%

Four Hypotheses to Explain Axillary Budbreak after Removal of Flower Shoots in a Cut-rose Crop

Wubs¹,

Heuvelink²,

Marcelis³

et al. 2013

J. Amer. Soc. Hort. Sci.

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When flower-bearing shoots in cut-rose (Rosa ×hybrida) are harvested (removed), a varying number of repressed axillary buds on the shoot remainder start to grow into new shoots (budbreak). Besides removing within-shoot correlative inhibition, it is hypothesized that shoot removal leads to 1) increased light intensity lower in the crop canopy; 2) changes in the light spectrum (particularly red:far-red ratio); and 3) changed source:sink ratio (i.e., the ratio between supply and demand of assimilates). As a fourth hypothesis it is proposed that the degree of budbreak on a shoot remainder is also influenced by the correlative inhibition exerted by other shoots on the plant. It is the goal of this work to determine which of these four hypotheses is most important for budbreak in a cut-rose crop. Four experiments were conducted, in which these factors were varied by leaf removal, removal of mature shoots, varying the number of young shoots, shading of the crop, and application of direct light on the buds. Increase in source:sink ratio was not consistently associated with higher budbreak. If source:sink ratio was decreased by removal of leaves or a mature shoot, budbreak showed even a tendency to increase. Budbreak was subject to correlative inhibition exerted by other shoots on the plant. Treatments where more light reached the bud (as a result of less shoots, no shading of the crop, application of local light) increased budbreak. Increased red:far-red ratio had the same result as more light reaching the bud but was often interrelated with light intensity. It was concluded that after removal of the flower-bearing shoot, among the factors tested, light intensity on the buds was an important and consistent factor explaining budbreak on the shoot remainder, whereas the effect of light spectrum should be further investigated.

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Photoperiod, light, and temperature requirements to control plant architecture and flowering time inSalvia exserta

Cited by 10 publications

References 29 publications

Axillary Budbreak in a Cut Rose Crop as Influenced by Light Intensity and Red:far-red Ratio at Bud Level

Axillary Budbreak in a Cut Rose Crop as Influenced by Light Intensity and Red:far-red Ratio at Bud Level

Physiological responses of spring rapeseed (Brassica napus) to red/far‐red ratios and irradiance during pre‐ and post‐flowering stages

Four Hypotheses to Explain Axillary Budbreak after Removal of Flower Shoots in a Cut-rose Crop

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