Arabidopsis thaliana floral stem elongation: Evidence for an endogenous circadian rhythm

Jouve, Laurent; Greppin, Hubert; Agosti, Robert Degli

doi:10.1016/s0981-9428(98)80212-x

Cited by 36 publications

(23 citation statements)

References 16 publications

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“…This is quite similar to the growth pattern of the Arabidopsis inflorescence stem in which the circadian clock modulates auxin transport, auxin sensitivity, or both, to yield a rhythm in the rate of elongation (Jouve et al, 1998(Jouve et al, , 1999. The Lhc (also called CAB) mRNA levels exhibit a robust circadian pattern under free-running conditions in LL, despite the continuous presence of phytochrome in the active form (Millar and Kay, 1996).…”

Section: Possible Fine Tuning Of Xsp30 Expression By Gasupporting

confidence: 53%

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

et al. 2003

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Root-produced organic compounds in xylem sap, such as hormones and amino acids, are known to be important in plant development. Recently, biochemical approaches have revealed the identities of several xylem sap proteins, but the biological functions and the regulation of the production of these proteins are not fully understood. XYLEM SAP PROTEIN 30 kD (XSP30), which is specifically expressed in the roots of cucumber (Cucumis sativus), encodes a lectin and is hypothesized as affecting the development of above-ground organs. In this report, we demonstrate that XSP30 gene expression and the level of XSP30 protein fluctuate in a diurnal rhythm in cucumber roots. The rhythmic gene expression continues for at least two or three cycles, even under continuous light or dark conditions, demonstrating that the expression of this gene is controlled by a circadian clock. Removal of mature leaves or treatment of shoots with uniconazole-P, an inhibitor of gibberellic acid (GA) biosynthesis, dampens the amplitude of the rhythmic expression; the application of GA negates these effects. These results suggest that light signals perceived by above-ground organs, as well as GA that is produced, possibly, in mature leaves, are important for the rhythmic expression of XSP30 in roots. This is the first demonstration of the regulation of the expression of a clock-controlled gene by GA.The higher plant body consists of functionally specialized organs such as the leaf, stem, flower, and root. Because plants grow in changing environments, it is essential for different organs to interact to ensure that the plant body develops and functions properly. Information transfer between organs is essential for synchronized plant development (Bernier, 1988;Kolek and Kozinka, 1991). A major route for the transfer of materials between organs consists of the vascular bundles, which are composed mainly of the xylem and phloem. Numerous materials are translocated over long distances through these bundles. The xylem is composed mainly of xylem vessels, which form a type of apoplastic space. Organic nutrients, such as amino acids, sugars, and organic acids, as well as water and inorganic nutrients, are transported through the xylem to the aboveground organs (Schurr and Schulze, 1995;Zornoza et al., 1996;Satoh et al., 1998). Interestingly, the roots control aspects of the development of aerial organs, possibly acting via growth-related compounds in the xylem sap (Kinet et al., 1993;Satoh, 1996). For example, cytokinin, abscisic acid, and other growth-related compounds that are synthesized in root tissues are involved in stomatal responses (Else et al., 1995;Liang et al., 1997), leaf senescence (Nooden et al., 1990;Soejima et al., 1992), lateral bud development (Bangerth, 1994; Beveridge et al., 1997), flower bud formation (Kinet et al., 1993), leaf greening , and adventitious root formation (Kuroha et al., 2002).Recently, macromolecules have been found in xylem sap, including oligo-and polysaccharides (Satoh et al., 1992; Campbell et al., 1995) and protei...

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Section: Possible Fine Tuning Of Xsp30 Expression By Gasupporting

confidence: 53%

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

et al. 2003

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“…In Arabidopsis, there is a circadian rhythm in the elongation rate of the abaxial and adaxial cells of the petiole that confers an oscillation in position of cotyledons and leaves (Engelmann and Johnsson, 1998). Arabidopsis also exhibits a circadian rhythm in the rate of hypocotyl elongation (Dowson-Day and Millar, 1999) and in the elongation rate of inflorescence stem (Jouve et al, 1998).…”

Section: Arabidopsis Displays Many Circadian Rhythmsmentioning

confidence: 99%

Plant Circadian Rhythms

2006

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“…Free auxin levels are clock regulated (Jouve et al, 1998;Rawat et al, 2009), and in addition, plant sensitivity to auxin varies in a circadian manner . As expected given these findings, genes encoding auxin signaling components and auxinresponsive genes show a higher incidence of circadian regulation than expected by chance .…”

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confidence: 99%

Genomic Analysis of Circadian Clock-, Light-, and Growth-Correlated Genes Reveals PHYTOCHROME-INTERACTING FACTOR5 as a Modulator of Auxin Signaling in Arabidopsis

2011

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Plants exhibit daily rhythms in their growth, providing an ideal system for the study of interactions between environmental stimuli such as light and internal regulators such as the circadian clock. We previously found that two basic loop-helix-loop transcription factors, PHYTOCHROME-INTERACTING FACTOR4 (PIF4) and PIF5, integrate light and circadian clock signaling to generate rhythmic plant growth in Arabidopsis (Arabidopsis thaliana). Here, we use expression profiling and realtime growth assays to identify growth regulatory networks downstream of PIF4 and PIF5. Genome-wide analysis of light-, clock-, or growth-correlated genes showed significant overlap between the transcriptomes of clock-, light-, and growth-related pathways. Overrepresentation analysis of growth-correlated genes predicted that the auxin and gibberellic acid (GA) hormone pathways both contribute to diurnal growth control. Indeed, lesions of GA biosynthesis genes retarded rhythmic growth. Surprisingly, GA-responsive genes are not enriched among genes regulated by PIF4 and PIF5, whereas auxin pathway and response genes are. Consistent with this finding, the auxin response is more severely affected than the GA response in pif4 pif5 double mutants and in PIF5-overexpressing lines. We conclude that at least two downstream modules participate in diurnal rhythmic hypocotyl growth: PIF4 and/or PIF5 modulation of auxin-related pathways and PIF-independent regulation of the GA pathway.

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Arabidopsis thaliana floral stem elongation: Evidence for an endogenous circadian rhythm

Cited by 36 publications

References 16 publications

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

Possible Involvement of Leaf Gibberellins in the Clock-Controlled Expression of XSP30, a Gene Encoding a Xylem Sap Lectin, in Cucumber Roots

Plant Circadian Rhythms

Genomic Analysis of Circadian Clock-, Light-, and Growth-Correlated Genes Reveals PHYTOCHROME-INTERACTING FACTOR5 as a Modulator of Auxin Signaling in Arabidopsis

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