Phytochrome B Enhances Photosynthesis at the Expense of Water-Use Efficiency in Arabidopsis

Boccalandro, Hernán E.; Rugnone, Matías Leandro; Moreno, José; Ploschuk, Edmundo L.; Serna, Laura; Yanovsky, Marcelo J.; Casal, Jorge J.

doi:10.1104/pp.109.135509

Cited by 164 publications

(146 citation statements)

References 66 publications

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“…Conversely, both phyB (Boccalandro et al, 2009;Casson et al, 2009) and cry are involved in long-term changes that indirectly condition rapid stomatal responses. In the case of phyB, the effects on stomatal density (Boccalandro et al, 2009;Casson et al, 2009) are larger than the effects on stomatal aperture (Wang et al, 2010). In the case of cry, the effects on stomatal aperture are larger than the effects on stomatal density (this article).…”

Section: Discussionmentioning

confidence: 99%

“…High irradiances, typical of open places and seasons with clear skies, increase stomatal density (Willmer and Fricker, 1996;Lake et al, 2001;Thomas et al, 2004;Casson and Gray, 2008). The high red to farred ratios of open places also increase stomatal density compared to the low ratios of dense vegetation canopies (Boccalandro et al, 2009). These effects of irradiance (Casson et al, 2009) and red/far-red ratio (Boccalandro et al, 2009) are at least partially mediated by phytochrome B (phyB) perception of the light signals.…”

mentioning

confidence: 99%

“…The high red to farred ratios of open places also increase stomatal density compared to the low ratios of dense vegetation canopies (Boccalandro et al, 2009). These effects of irradiance (Casson et al, 2009) and red/far-red ratio (Boccalandro et al, 2009) are at least partially mediated by phytochrome B (phyB) perception of the light signals. Cryptochrome 1 (cry1) and 2 (cry2) increase stomatal index ), i.e.…”

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confidence: 99%

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Phototropins But Not Cryptochromes Mediate the Blue Light-Specific Promotion of Stomatal Conductance, While Both Enhance Photosynthesis and Transpiration under Full Sunlight

et al. 2011

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Leaf epidermal peels of Arabidopsis (Arabidopsis thaliana) mutants lacking either phototropins 1 and 2 (phot1 and phot2) or cryptochromes 1 and 2 (cry1 and cry2) exposed to a background of red light show severely impaired stomatal opening responses to blue light. Since phot and cry are UV-A/blue light photoreceptors, they may be involved in the perception of the blue light-specific signal that induces the aperture of the stomatal pores. In leaf epidermal peels, the blue light-specific effect saturates at low irradiances; therefore, it is considered to operate mainly under the low irradiance of dawn, dusk, or deep canopies. Conversely, we show that both phot1 phot2 and cry1 cry2 have reduced stomatal conductance, transpiration, and photosynthesis, particularly under the high irradiance of full sunlight at midday. These mutants show compromised responses of stomatal conductance to irradiance. However, the effects of phot and cry on photosynthesis were largely nonstomatic. While the stomatal conductance phenotype of phot1 phot2 was blue light specific, cry1 cry2 showed reduced stomatal conductance not only in response to blue light, but also in response to red light. The levels of abscisic acid were elevated in cry1 cry2. We conclude that considering their effects at high irradiances cry and phot are critical for the control of transpiration and photosynthesis rates in the field. The effects of cry on stomatal conductance are largely indirect and involve the control of abscisic acid levels.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Phototropins But Not Cryptochromes Mediate the Blue Light-Specific Promotion of Stomatal Conductance, While Both Enhance Photosynthesis and Transpiration under Full Sunlight

et al. 2011

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“…The mechanisms by which phytochrome influences water economy may be more or less complicated (Boccalandro et al, 2009;González et al, 2012;Sokolskaya et al, 2003). Some recent reports show that the phytochrome increases tolerance to high evaporative demand (Auge et al, 2012) and that phytochromes phyA and phyB can modulate drought stress responses (D' Amico-Damiāo et al, 2015).…”

Section: Along With Vascular Plantsmentioning

confidence: 99%

Atmospheric moisture controls far-red irradiation: a probable impact on the phytochrome

Doroszewski

Górski

Kozyra

2015

International Agrophysics

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A b s t r a c t. It is commonly accepted that an important role of the phytochrome lies in signalling the proximity of competing plants. However, not all photoresponses conveyed by the phytochrome can be explained by the competition only. Because a better description of the natural variability of solar spectral irradiance is necessary to recognize the other roles of the phytochrome, long-lasting spectroradiometric measurements have been performed. Special attention has been paid to the relations between the far-red and red bands of the solar spectrum, which have an impact on the phytochrome. The effect of atmospheric moisture on far-red irradiance (attenuated in the 720 nm band of water vapour absorption) is described. The far-red irradiance, active in the 'high irradiance response' of the phytochrome, and the red/ far-red ratio, important for the 'low fluence response', may vary very strongly relative to the atmospheric moisture. Together with other facts known from photophysiology, the results of the measurements enabled us to formulate a thesis that the phytochrome monitors the amount of water vapour and opens appropriate metabolic pathways to cope with the danger of drought. The recognition of this novel role of the phytochrome might broaden the knowledge in the area of plant photomorphogenesis and ecology.

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“…In the absence of functional PhyB, the PIF transcription factors are not degraded and thus continue to repress transcription of the essential genes required for chloroplast development and function (Chory et al 1989;Stephenson et al 2009). Loss of PhyB function not only impairs chloroplast development but also affects other processes such as shade avoidance, water use efficiency and flowering time (Reed et al 1993;Boccalandro et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Genetic suppression of plant development and chloroplast biogenesis via the Snowy Cotyledon 3 and Phytochrome B pathways

Ganguly

Crisp

Harter

et al. 2015

Functional Plant Biol.

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Abstract. Plant development is regulated by external and internal factors such as light and chloroplast development. A revertant of the Arabidopsis thaliana (L.) Heyhn. chloroplast biogenesis mutant snowy cotyledon 3 (sco3-1) was isolated partially recovering the impaired chloroplast phenotype. The mutation was identified in the Phytochrome B (PhyB) gene and is a result of an amino acid change within the PAS repeat domain required for light-induced nuclear localisation. An independent phyB-9 mutation was crossed into sco3-1 mutants, resulting in the same partial reversion of sco3-1. Further analysis demonstrated that SCO3 and PhyB influence the greening process of seedlings and rosette leaves, embryogenesis, rosette formation and flowering. Interestingly, the functions of these proteins are interwoven in various ways, suggesting a complex genetic interaction. Whole-transcriptome profiling of sco3-1phyB-9 indicated that a completely distinct set of genes was differentially regulated in the double mutant compared with the single sco3-1 or phyB-9 mutants. Thus, we hypothesise that PhyB and SCO3 genetically suppress each other in plant and chloroplast development.

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Phytochrome B Enhances Photosynthesis at the Expense of Water-Use Efficiency in Arabidopsis

Cited by 164 publications

References 66 publications

Phototropins But Not Cryptochromes Mediate the Blue Light-Specific Promotion of Stomatal Conductance, While Both Enhance Photosynthesis and Transpiration under Full Sunlight

Phototropins But Not Cryptochromes Mediate the Blue Light-Specific Promotion of Stomatal Conductance, While Both Enhance Photosynthesis and Transpiration under Full Sunlight

Atmospheric moisture controls far-red irradiation: a probable impact on the phytochrome

Genetic suppression of plant development and chloroplast biogenesis via the Snowy Cotyledon 3 and Phytochrome B pathways

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