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PMID:19363093

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Citation

Boccalandro, HE, Rugnone, ML, Moreno, JE, Ploschuk, EL, Serna, L, Yanovsky, MJ and Casal, JJ (2009) Phytochrome B enhances photosynthesis at the expense of water-use efficiency in Arabidopsis. Plant Physiol. 150:1083-92

Abstract

In open places, plants are exposed to higher fluence rates of photosynthetically active radiation and to higher red to far-red ratios than under the shade of neighbor plants. High fluence rates are known to increase stomata density. Here we show that high, compared to low, red to far-red ratios also increase stomata density in Arabidopsis (Arabidopsis thaliana). High red to far-red ratios increase the proportion of phytochrome B (phyB) in its active form and the phyB mutant exhibited a constitutively low stomata density. phyB increased the stomata index (the ratio between stomata and epidermal cells number) and the level of anphistomy (by increasing stomata density more intensively in the adaxial than in the abaxial face). phyB promoted the expression of FAMA and TOO MANY MOUTHS genes involved in the regulation of stomata development in young leaves. Increased stomata density resulted in increased transpiration per unit leaf area. However, phyB promoted photosynthesis rates only at high fluence rates of photosynthetically active radiation. In accordance to these observations, phyB reduced long-term water-use efficiency estimated by the analysis of isotopic discrimination against (13)CO(2). We propose a model where active phyB promotes stomata differentiation in open places, allowing plants to take advantage of the higher irradiances at the expense of a reduction of water-use efficiency, which is compensated by a reduced leaf area.

Links

PubMed PMC2689964 Online version:10.1104/pp.109.135509

Keywords

Arabidopsis/physiology; Arabidopsis/radiation effects; Arabidopsis Proteins/metabolism; Light; Photosynthesis/radiation effects; Phytochrome B/metabolism; Plant Stomata/metabolism; Plant Stomata/radiation effects; Plant Transpiration/radiation effects; Signal Transduction/radiation effects; Water/physiology

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:PHYB

acts_upstream_of_or_within

GO:0015979: photosynthesis

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:PHYB

acts_upstream_of_or_within

GO:0010374: stomatal complex development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:PHYB

acts_upstream_of_or_within

GO:0010148: transpiration

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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