Bell-like homeodomain selectively regulates the high-irradiance response of phytochrome A

Staneloni, Roberto J.; Rodríguez‐Batiller, María José; Legisa, Danilo Mario; Scarpin, M Regina; Agalou, Adamantia; Cerdán, Pablo D.; Meijer, Annemarie H.; Ouwerkerk, Pieter B.F.; Casal, Jorge J.

doi:10.1073/pnas.0906598106

Cited by 32 publications

(30 citation statements)

References 38 publications

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“…Notably, some potential PNY binding sites within these genomic regions were identified. For example, the P3 genomic region contains a core motif (ATGGAT) reported as a binding site for BEL1-LIKE HOMEODOMAIN (BLH1; Staneloni et al, 2009). Within the region P7, the two motifs AAATTACCA and AATTATCCT, which are similar to those previously identified as binding sites of BELLRINGER (BLR) in the AGAMOUS intronic region (AAATTAAAT, AAAT-TAGTC, and ACTAATTT; Bao et al, 2004;Smaczniak et al, 2012), were also found.…”

Section: Pny Represses Bop1 and Bop2 Transcription By Directly Bindinmentioning

confidence: 61%

Floral induction in Arabidopsis thaliana by FLOWERING LOCUS T requires direct repression of BLADE-ON-PETIOLE genes by homeodomain protein PENNYWISE

et al. 2015

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Section: Pny Represses Bop1 and Bop2 Transcription By Directly Bindinmentioning

confidence: 61%

Floral induction in Arabidopsis thaliana by FLOWERING LOCUS T requires direct repression of BLADE-ON-PETIOLE genes by homeodomain protein PENNYWISE

et al. 2015

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“…The hook exaggeration in tomato is a rare case where VLFR does not accompany FR-HIR, although both responses are commonly mediated by phyA. However, the uncoupling of the two phyA responses may be rationalized by the findings that distinct signal transduction systems from phyA led to the two responses (Staneloni et al 2009). …”

Section: Discussionmentioning

confidence: 93%

Light exaggerates apical hook curvature through phytochrome actions in tomato seedlings

Shichijo

Ohuchi

Iwata

et al. 2009

Planta

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Contrary to the established notion that the apical hook of dark-grown dicotyledonous seedlings opens in response to light, we found in tomato (Solanum lycopersicum L.) that the apical hook curvature is exaggerated by light. Experiments with several tomato cultivars and phytochrome mutants, irradiated with red and far-red light either as a brief pulse (Rp, FRp) or continuously (Rc, FRc), revealed: the hook-exaggeration response is maximal at the emergence of the hypocotyl from the seed; the effect of Rp is FRp-reversible; fluence-response curves to a single Rp or FRp show an involvement of low and very low fluence responses (LFR, VLFR); the effect of Rc is fluence-rate dependent, but that of FRc is not; the phyA mutant (phyA hp-1) failed to respond to an Rp of less than 10(-2) micromol m(-2) and to an FRp of all fluences tested as well as to FRc, thus indicating that the hook-exaggeration response involves phyA-mediated VLFR. The Rp fluence-response curve with the same mutant also confirmed the presence of an LFR mediated by phytochrome(s) other than phyA, although the phyB1 mutant (phyB1 hp-1) still showed full response probably due to other redundant phytochrome species (e.g., phyB2). Simulation experiments led to the possible significance of hook exaggeration in the field that the photoresponse may facilitate the release of seed coat when seeds germinate at some range of depth in soil. It was also observed that seed coat and/or endosperm are essential to the hook exaggeration.

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“…2C). In the WT and ft mutant, supplementary far-red light caused some reduction of hypocotyl growth indicating that the high-irradiance response (30) dominates over the shadeavoidance response at this early stage of the life of the seedling ( Fig. 2C; see also ref.…”

Section: Resultsmentioning

confidence: 99%

Arabidopsis thaliana life without phytochromes

Strasser

Sánchez‐Lamas

Yanovsky

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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172

150

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Plants use light as a source of energy for photosynthesis and as a source of environmental information perceived by photoreceptors. Testing whether plants can complete their cycle if light provides energy but no information about the environment requires a plant devoid of phytochromes because all photosynthetically active wavelengths activate phytochromes. Producing such a quintuple mutant of Arabidopsis thaliana has been challenging, but we were able to obtain it in the flowering locus T ( ft ) mutant background. The quintuple phytochrome mutant does not germinate in the FT background, but it germinates to some extent in the ft background. If germination problems are bypassed by the addition of gibberellins, the seedlings of the quintuple phytochrome mutant exposed to red light produce chlorophyll, indicating that phytochromes are not the sole red-light photoreceptors, but they become developmentally arrested shortly after the cotyledon stage. Blue light bypasses this blockage, rejecting the long-standing idea that the blue-light receptors cryptochromes cannot operate without phytochromes. After growth under white light, returning the quintuple phytochrome mutant to red light resulted in rapid senescence of already expanded leaves and severely impaired expansion of new leaves. We conclude that Arabidopsis development is stalled at several points in the presence of light suitable for photosynthesis but providing no photomorphogenic signal.

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Bell-like homeodomain selectively regulates the high-irradiance response of phytochrome A

Abstract: Arabidopsis thaliana ͉ promoter ͉ TALE

Cited by 32 publications

References 38 publications

Floral induction in Arabidopsis thaliana by FLOWERING LOCUS T requires direct repression of BLADE-ON-PETIOLE genes by homeodomain protein PENNYWISE

Floral induction in Arabidopsis thaliana by FLOWERING LOCUS T requires direct repression of BLADE-ON-PETIOLE genes by homeodomain protein PENNYWISE

Light exaggerates apical hook curvature through phytochrome actions in tomato seedlings

Arabidopsis thaliana life without phytochromes

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