Phytochrome gene diversity

Mathews, Sarah; Sharrock, Robert A.

doi:10.1046/j.1365-3040.1997.d01-117.x

Cited by 264 publications

(225 citation statements)

References 38 publications

(38 reference statements)

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“…DK696 data are redrawn after Maddonni et al (2001a). (Mathews and Sharrock, 1997), but these genes are duplicated in maize (Christensen and Quail, 1989). Phytochrome B is involved in the control of plant stature, tillering, and flowering time in sorghum (Childs et al, 1997), and the control of flowering time in barley (Hanumappa et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Maize Leaves Turn Away from Neighbors

Maddonni¹,

Otegui²,

Andrieu³

et al. 2002

Plant Physiology

147

114

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In commercial crops, maize (Zea mays) plants are typically grown at a larger distance between rows (70 cm) than within the same row (16-23 cm). This rectangular arrangement creates a heterogeneous environment in which the plants receive higher red light (R) to far-red light (FR) ratios from the interrow spaces. In field crops, the hybrid Dekalb 696 (DK696) showed an increased proportion of leaves toward interrow spaces, whereas the experimental hybrid 980 (Exp980) retained random leaf orientation. Mirrors reflecting FR were placed close to isolated plants to simulate the presence of neighbors in the field. In addition, localized FR was applied to target leaves in a growth chamber. During their expansion, the leaves of DK696 turned away from the low R to FR ratio signals, whereas Exp980 leaves remained unaffected. On the contrary, tillering was reduced and plant height was increased by low R to FR ratios in Exp980 but not in DK696. Isolated plants preconditioned with low R/FR-simulating neighbors in a North-South row showed reduced mutual shading among leaves when the plants were actually grouped in North-South rows. These observations contradict the current view that phytochrome-mediated responses to low R/FR are a relic from wild conditions, detrimental for crop yield.

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Section: Discussionmentioning

confidence: 99%

Maize Leaves Turn Away from Neighbors

Maddonni¹,

Otegui²,

Andrieu³

et al. 2002

Plant Physiology

147

114

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“…1). Unlike the dicots, the phytochrome family in monocots contains three different phytochromes designated as phyA, phyB, and phyC (Mathews and Sharrock, 1997). Phytochromes in rice (Oryza sativa) are present as single-copy genes .…”

Section: The Phytochrome-pif Signaling Module Is Evolutionarily Consementioning

confidence: 99%

Phytochromes and Phytochrome Interacting Factors

2017

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The basic helix-loop-helix domain-containing transcription factors that interact physically with the red and far-red light photoreceptors, phytochromes, are called PHYTOCHROME INTERACTING FACTORS (PIFs). In the last two decades, the phytochrome-PIF signaling module has been shown to be conserved from Physcomitrella patens to higher plants. Exciting recent studies highlight the discovery of at least four distinct kinases (PPKs, CK2, BIN2, and phytochrome itself) and four families of ubiquitin ligases (SCF EBF 1/2 , CUL3 LRB , CUL3 BOP , and CUL4 COP1-SPA ) that regulate PIF abundance both in dark and light conditions. This review discusses these recent discoveries with a focus on the central phytochrome signaling mechanisms that have a profound impact on plant growth and development in response to light.

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“…Phytochromes are plant photoreceptors encoded by small gene families in higher plants (Mathews & Sharrock 1997; Correspondetice: Carlos L. liallare. Eax: 54 152113H4: e-tnail: hallare@ifeva.edii.ar Quail 1997).…”

Section: Introductionmentioning

confidence: 99%

Directed overexpression of PHYA locally suppresses stem elongation and leaf senescence responses to far‐red radiation

Rousseaux

Ballaré

Jordan

et al. 1997

Plant Cell & Environment

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Ectopic overexpression of an oat PHYA cDNA in tobacco under the cauliflower mosaic virus 35S promoter results in plants with reduced morphological responses to far-red radiation (FR). We have tested the hypothesis that it is possible to molecularly 'mask' stems and leaves to FR-induced elongation and senescence responses by targeting the overexpression ol'PHYA with appropriate promoters. Oat PHYA was expressed in tobacco {Nicotiana tahacum L. cv Xanthi) under the 35S and two Arabidopsis promoters: UBQl and CAB. The internodes of wild type, UBQ.PHYA, and CAB.PHYA plants, which exhibited little or no oat PHYA overexpression, responded to locali/.ed FR treatments with a marked increase in elongation. In contrast, 35S:PHYA plants, which overexpressed PHYA to high levels in all parts of the shoot, did not respond to FR treatments directed to their stems. Leaf senescence responses to FR were remarkably localized, and sensitivity to FR was also inversely correlated with the local PHYA expression level. Thus, chlorophyll content, specific leaf weight, and nitrate reductase activity in leaf spots treated with FR were highly reduced in wild type and UBQ:PHYA plants, but not in the CAB.PHYA and 35S:PHYA counterparts. Our results suggest that it may be feasible to obtain transgenie crop plants in which certain organs or tissues are made 'blind' to phytochrome-perceived signals of canopy density, but whose general photoniorpbogenic competence is not greatly disturbed.

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Phytochrome gene diversity

Cited by 264 publications

References 38 publications

Maize Leaves Turn Away from Neighbors

Maize Leaves Turn Away from Neighbors

Phytochromes and Phytochrome Interacting Factors

Directed overexpression of PHYA locally suppresses stem elongation and leaf senescence responses to far‐red radiation

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