Oriental Plane Tree Disease

Wald, George; Buy, H. G. du

doi:10.1126/science.84.2176.247-a

Cited by 38 publications

(15 citation statements)

References 2 publications

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“…Furthermore, the fact that red light was equally as effective as white light in the inactivation strongly suggests that auxin probably is not the factor directly affected by light. Auxin inactivation in vitro by a brei of etiolated pea epicotyls is greatest in the blue-green wave lengths (3900 to 5200 A), the range of absorption of ft-carotene and riboflavin (4,18).…”

Section: Discussionmentioning

confidence: 99%

Effects of Light on Elongation and Branching in Pea Roots

Torrey

1952

Plant Physiol.

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Section: Discussionmentioning

confidence: 99%

Effects of Light on Elongation and Branching in Pea Roots

Torrey

1952

Plant Physiol.

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“…zinc-zinc sulphate electrodes. Glass figure 1A show the changes in the long,itudinal electrical polarity of the apical 15 figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…Heat from the lamp was absorbed by a layer of water 2 cm. deep located 15 cm. below the lower rim of the reflector.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Light on the Electrical Polarity and the Rate of Elongation of the Avena Coleoptile

Schrank

1946

Plant Physiol.

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“…Over the years, a variety of different chromophores for blue-light photoreceptors has been proposed, including flavins (Galston, 1949), carotenoids (Wald and DuBuy, 1936), pterins (Galland and Senger, 1988), and retina1 (Lorenzi et al, 1994). Recently, Ahmad and Cashmore (1993) described a putative photoreceptor for the suppression of hypocotyl elongation in Arabidopsis thaliana (L.) Heyhn.…”

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confidence: 99%

Evidence That Zeaxanthin Is Not the Photoreceptor for Phototropism in Maize Coleoptiles

1996

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The photoreceptor that mediates blue-light-induced phototropism in dark-grown seedlings of higher plants has not been identified, although the carotenoid zeaxanthin has recently been proposed as the putative chromophore. In the experiments described in this paper, we analyzed phototropism and a blue-light-induced protein phosphorylation that has been genetically and physiologically implicated in phototropism in wild-type maize (Zea mays 1.) seedlings and compared the results with those from seedlings that are either carotenoid deficient through a genetic lesion or have been chemically treated to block carotenoid biosynthesis. The bluelight-dependent phototropism and phosphorylation responses of seedlings deficient in carotenoids are the same as those of seedlings containing normal levels of carotenoids. These results and those in the literature make it unlikely that zeaxanthin or any other carotenoid is the chromophore of the blue-light photoreceptor for phototropism or the blue-light-induced phosphorylation related to phototropism.In plants, a diverse array of phenomena are induced by blue light, ranging from changes in growth and development, such as phototropism and the inhibition of hypocotyl elongation, to transitory phenomena, such as solar tracking of leaves and the opening of stomata (Short and Briggs, 1994). These responses occur in a wide variety of tissues and cell types and are induced under widely differing light conditions, an indication that different blue-light photoreceptors may mediate these responses.Over the years, a variety of different chromophores for blue-light photoreceptors has been proposed, including flavins (Galston, 1949), carotenoids (Wald and DuBuy, 1936), pterins (Galland and Senger, 1988), and retina1 (Lorenzi et al., 1994). Recently, Ahmad and Cashmore (1993) described a putative photoreceptor for the suppression of hypocotyl elongation in Arabidopsis thaliana (L.)Heyhn. The cloned gene encodes a protein with sequence homology to prokaryotic and eukaryotic DNA photolyases, enzymes known to use a flavin as a chromophore, and the (1994) recently observed severa1 correlations between the leve1 of zeaxanthin, a carotenoid of the xanthophyll cycle, and phototropic sensitivity in maize (Zea mays L.). They suggested that zeaxanthin might be the photoreceptor chromophore for phototropism in this species on the basis of these correlations. In this paper we present data that indicate that carotenoids, including zeaxanthin, are unlikely to be the chromophores mediating phototropism in dark-grown maize coleoptiles, because under our conditions, the correlation between zeaxanthin content and phototropism fails completely, as does the correlation between any other carotenoid and phototropism. Since different maize cultivars can vary considerably in various aspects of their phototropic responses (Briggs, 1963), we included the cultivar used by Quifiones and Zeiger (1994) in these studies. Albino homozygous mutants (w3/w3) of W3 were also obtained by self-fertilizing greenhouse-grown heter...

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Oriental Plane Tree Disease

Cited by 38 publications

References 2 publications

Effects of Light on Elongation and Branching in Pea Roots

Effects of Light on Elongation and Branching in Pea Roots

The Effect of Light on the Electrical Polarity and the Rate of Elongation of the Avena Coleoptile

Evidence That Zeaxanthin Is Not the Photoreceptor for Phototropism in Maize Coleoptiles

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