Photoinhibition of Elongation Growth of Roots in Rice Seedlings

Ohno, Y.; Fujiwara, Akio

doi:10.1093/oxfordjournals.pcp.a079235

Cited by 35 publications

(17 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In roots, negative phototropic growth is induced by light (Parks and Poff, 1986;Feldman and Briggs, 1987;Blancaflor and Masson, 2003). Light also plays a possible role in the initiation of lateral roots (Furuya and Torrey, 1964;Ohno and Fujiwara, 1967). Light regulation of gene expression in roots has been discussed (Hemm et al, 2004;Sato-Nara et al, 2004).…”

Section: Divergence Of Light Effect In Different Organsmentioning

confidence: 99%

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

et al. 2005

View full text Add to dashboard Cite

Genome-wide 70-mer oligonucleotide microarrays of rice (Oryza sativa) and Arabidopsis thaliana were used to profile genome expression changes during light-regulated seedling development. We estimate that the expression of ;20% of the genome in both rice and Arabidopsis seedlings is regulated by white light. Qualitatively similar expression profiles from seedlings grown under different light qualities were observed in both species; however, a quantitatively weaker effect on genome expression was observed in rice. Most metabolic pathways exhibited qualitatively similar light regulation in both species with a few species-specific differences. Global comparison of expression profiles between rice and Arabidopsis reciprocal best-matched gene pairs revealed a higher correlation of genome expression patterns in constant light than in darkness, suggesting that the genome expression profile of photomorphogenesis is more conserved. Transcription factor gene expression under constant light exposure was poorly conserved between the two species, implying a faster-evolving rate of transcription factor gene expression in light-grown plants. Organ-specific expression profiles during seedling photomorphogenesis provide genome-level evidence for divergent light effects in different higher plant organs. Finally, overrepresentation of specific promoter motifs in root-and leaf-specific light-regulated genes in both species suggests that these cis-elements are important for gene expression responses to light.

show abstract

Section: Divergence Of Light Effect In Different Organsmentioning

confidence: 99%

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Red light was most effective with maize roots (Schwarz and Schneider, 1985), while blue light was more effective with excised wheat roots (Björn et al, 1963). With rice seedlings, blue light inhibited root growth through suppression of both cell elongation and division, but red or far-red light inhibited only cell elongation (Ohno and Fujiwara, 1967). The use of the photosynthetic inhibitor, DCMU, showed that photosynthetic activity was not required for the photoinhibition (Ohno and Fujiwara, 1967).…”

Section: Introductionmentioning

confidence: 99%

Light-stimulated root elongation in Arabidopsis thaliana

Kurata

Yamamoto

1997

Journal of Plant Physiology

View full text Add to dashboard Cite

SummaryWe investigated the effects of continuous irradiation either with white light or far-red light on elongation of roots of Arabidopsis thaliana. The white light used lacked most spectral components in the far-red region. The white-light irradiation of a whole seedling stimulated root growth; DCMU, an inhibitor of photosynthesis, completely inhibited this stimulation.Excised roots lost their responsiveness to light. Sugars produced during photosynthesis stimulated the elongation of roots in the dark. Root growth was also promoted by continuous exposure of a whole seedling to far-red light although chlorophyll did not accumulate at the same rate as under white light. The effect of far-red light was not inhibited by DCMU. In a phyA mutant, there was no stimulation of root growth under far-red light.These results show that root growth is primarily promoted by photosynthetic activity, and that phytochrome A stimulates root growth independently of photosynthesis. In a phyB mutant, there was no stimulation of root growth by either white, red or far-red light, suggesting that phytochrome B, either as Pr or Pfr, is necessary for the roots to respond 1 to light.

show abstract

“…Partial irradiations of shoots and roots demonstrated that roots of rice seedlings (Ohno and Fujiwara 1967) or the apical 1 mm of maize roots ) directly responded to the light stimulus that inhibited root growth. Using a series of microsurgical arrangements root cap of maize roots was the site of photoperception for the light-induced inhibition of root elongation in these seedlings.…”

Section: Discussionmentioning

confidence: 99%

“…Many studies have approached the question of the photoperceptive site in root responses such as the light induction of gravitropism (Tepfer and Bonnett 1972, Wilkins and Wain 1975, Pilet 1978) and photoinhibition of root growth (Ohno and Fujiwara 1967, Pilet and Ney 1978.…”

mentioning

confidence: 99%

Photoperceptive Site of the Photoinduction of Root Hairs in Lettuce (Lactuca sativa L. cv. Grand Rapids) Seedlings Under Low pH Conditions

2000

View full text Add to dashboard Cite

Lght induces root hair formation in etiolated lettuce(Lactuca sativa L. cv. Grand Rapids) seedlings under acidic conditions by a phytochrome-mediated response. Microbeam irradiation of l mm root segments with the first (100 JmV) and second (1,OOO J m 2 ) maxima of the fluence 'response curve for red light induction of root hair initiation indicated that the ca. 5 mm apical portion of 12 mm long roots was the site of photoperception. The root hair-forming portion of the root was situated at a distance of 1.7 mm from the root tip at the time of red light irradiation and extended (at most 1.5 mm) towards the basal end at a later stage of development, irrespective of which portion of the root was irradiated with red light.

show abstract

Photoinhibition of Elongation Growth of Roots in Rice Seedlings

Cited by 35 publications

References 0 publications

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

Conservation and Divergence of Light-Regulated Genome Expression Patterns during Seedling Development in Rice andArabidopsis [W]

Light-stimulated root elongation in Arabidopsis thaliana

Photoperceptive Site of the Photoinduction of Root Hairs in Lettuce (Lactuca sativa L. cv. Grand Rapids) Seedlings Under Low pH Conditions

Contact Info

Product

Resources

About