Light‐Quality Manipulation by Horticulture Industry

Rajapakse, Nihal C.; Shahak, Yosepha

doi:10.1002/9781119312994.apr0321

Cited by 2 publications

(1 citation statement)

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“…Flowering behaviour is modified by environmental cues, with light being one of the most important signals that regulates flowering through quality, quantity and duration (Thomas 2006). Plants perceive subtle changes in light composition, duration and direction through photoreceptor pigments, which result in physiological and morphological modifications necessary for adaptation to environmental changes (Rajapakse & Shakak 2007). In higher plants, the ‘shade avoidance syndrome’ is an adaptive developmental strategy mediated by the perception of light spectral quality, in particular the red to far-red ratio, R: FR, which acts as an early warning of potential shading (Salter et al 2003; Ballaré & Pierik 2017).…”

Section: Introductionmentioning

confidence: 99%

Gene networks underlying faster flowering induction in response to far-red light

Navarro

Ribalta

Hurgobin

et al. 2017

Preprint

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Light is one of the main signals that regulates flowering. Low red to far-red ratios accelerate flowering in a wide range of species. The central gene pathways controlling flowering time in Arabidopsis, appear to be largely conserved in legumes. However, numerous examples exist of gene duplication and loss. The role of CONSTANS-LIKE genes as integrators of the photoperiod response has been questioned in several dicot species, including legumes. In this study on subterranean clover, using RNA-seq and controlled light spectra, we identified 13 differentially expressed genes related to light signalling, meristem identity and flowering promotion. Of these, we pinpointed genes which seem to link photoperiod and far-red light signalling coding for a With no lysine kinase, a CCT motif related to CONSTANS, a FLOWERING LOCUS T b2 like protein, and their active downstream cascade. The earlier down-regulation of these genes under blue compared to far-red-enriched light may explain their role in floral induction. A second independent approach (qPCR analysis) confirmed our findings. Contrasting responses to light quality related to reproduction and defence mechanisms were also found. These results will contribute to a better understanding of the molecular basis of flowering in response to light quality in long-day plants.

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Section: Introductionmentioning

confidence: 99%

Gene networks underlying faster flowering induction in response to far-red light

Navarro

Ribalta

Hurgobin

et al. 2017

Preprint

View full text Add to dashboard Cite

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The Use of Red Shade Nets Improves Growth in Salinized Pepper (Capsicum annuum L.) Plants by Regulating Their Ion Homeostasis and Hormone Balance

et al. 2020

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The actual climate crisis scenario is aggravating the abiotic stress episodes that crop plants have to face. Salinity is one of the most important abiotic stresses directly impairing plant growth and productivity. Several strategies have been developed to minimize the negative effects of salinity in agricultural industry, mainly at the plant level, while management strategies, such us the control of microclimate conditions and light quality over plant canopy, have also been used. Indeed, shading plants with photoselective nets has been considered an efficient management strategy to modulate solar radiation to improve crop productivity. The aim of this work was to gain insights about the physiological factors underlying the salinity-alleviating effect of using red shading nets. For that, pepper plants (Capsicum annuum L.) were grown under control (0 mM NaCl) and moderate salinity (35 mM NaCl) conditions, with half of the plants covered with a red net (30% shading). The shoot growth impairment provoked by salinity was in part minimized by shading plants with red nets, which can be explained by their higher capacity to exclude Na+, control of K+ homeostasis and regulation of hormonal balance. Indeed, the concentrations of the most active cytokinin in pepper, trans-zeatin, as well as its metabolic precursor, zeatin riboside, increased in shaded plants, associated to shoot growth recovery and photosynthetic rate maintenance under salinity. Furthermore, the stress-related hormone abscisic acid (ABA) increased with salinity but in a lower extend in the plants shaded with red nets, suggesting a fine tune of stomata opening by ABA which, in crosstalk with salicylic acid increment, improved plant water relations. Likewise, the concentrations of gibberellins and the ethylene precursor, 1-aminocyclopropane-1-carboxylic acid, also changed during salinity stress in shaded plants but those changes were uncoupled of growth responses as indicated by the principal component analysis and thus they seem to play a minor role. Our data demonstrate that shading pepper plants with red nets is an efficient management strategy to modulate microclimate conditions at crop level thus controlling the ion homeostasis and hormonal balance of the plant to cope with salinity stress. This is especially important due to the actual and expected changes of the global climatic conditions.

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Light‐Quality Manipulation by Horticulture Industry

Abstract: The sections in this article areIntroductionRegions of Light Spectrum Important for Plant Growth and DevelopmentPlant Responses to Quality of LightLight Manipulation by Horticulture IndustryFuture Prospects

Cited by 2 publications

References 99 publications

Gene networks underlying faster flowering induction in response to far-red light

Gene networks underlying faster flowering induction in response to far-red light

The Use of Red Shade Nets Improves Growth in Salinized Pepper (Capsicum annuum L.) Plants by Regulating Their Ion Homeostasis and Hormone Balance

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