Phytochrome Action in Oryza Sativa L. Iii. The Separation of Photoperceptive Site and Growing Zone in Coleoptiles, and Auxin Transport as Effector System

Furuya, Masaki; Pjon, Che-Jun; Fujii, Tadashi; Ito, Michio

doi:10.1111/j.1440-169x.1969.00062.x

Cited by 51 publications

(41 citation statements)

References 11 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the site of red-light perception is often different from the growing region. For example, red light is perceived by the hook in radish (14), by the cotyledons in lightgrown cucumber (4), and by the coleoptile tip in rice (9), but the response in each of these cases occurs in the more basal growing regions. This difference in the site of perception and the site of response in red-light inhibition implicates the transmission of a stimulus or hormone of some kind.…”

Section: Discussionmentioning

confidence: 99%

Rapid Suppression of Growth by Blue Light

Cosgrove¹

1981

Plant Physiol.

227

View full text Add to dashboard Cite

The inhibition of stem elongation in dark-grown seedlings by blue Light was studied with marking techniques and with a high-resolution, growthmeasuring apparatus. Blue light rapidly suppresses growth in a variety of cultivated species. In some species, the inhibition persists only during the period of irradiation, after which time growth quickly returns to the high dark rate, whereas, in other species, the light response has an additional long-term component which lasts for at least several hours in the dark. The long-term inhibition may be mediated by phytochrome, whereas the rapid, short-term component is specific to a blue-light receptor.The rapid inhibition of growth in cucumber (Cucumis sativus L.) requires high-energy blue irradiation, which is perceived directly by the growing region of the hypocotyl and inhibits all regions below the hook to the same extent. Detailed investigation of the kinetics of the inhibition in cucumber and in sunflower (Heliantiws anus L.) shows that, after a short lag period (20 to 30 seconds in cucumber, 60 to 70 seconds in sunflower), the growth rate declines in an exponential fashion to a lower rate, with a half-time of 15 to 25 seconds in cucumber and 90 to 150 seconds in sunflower. Excision of the hypocotyl greatly reduces the sensitivity of the growth rate to blueUght inhibition. Because of the rapid kinetics, the blue-Ught photoreceptor cannot affect celi enlargement by altering the supply of growth hormone or the sensitivity to hormones but probably operates more directly either on the biochemical process which loosens cell walls or on celi turgor.

show abstract

Section: Discussionmentioning

confidence: 99%

Rapid Suppression of Growth by Blue Light

Cosgrove¹

1981

Plant Physiol.

227

View full text Add to dashboard Cite

show abstract

“…Thus, it is more probable that the mutant is impaired in the light-triggered effector system. Classical studies (Furuya et al, 1969) have linked the perception of light by the phytochrome system to auxin transport as the effector system responsible for the regulation of growth. We therefore asked whether light altered auxin content and whether the mutant behaved differently in this context.…”

Section: Red Light Triggers the Jasmonate Pathway In Rice Coleoptilesmentioning

confidence: 99%

“…The response is swift and exclusively based on an inhibition of cell elongation concomitant with a block of basipetal auxin transport from the perceptive site in the coleoptile tip to the major site of cell elongation in the basal region (Furuya et al, 1969). The light signal is perceived almost exclusively through the phytochrome system (Pjon and Furuya, 1967;Takano et al, 2001), whereas bluelight receptors are of negligible importance in rice coleoptiles (Neumann and Iino, 1997).…”

mentioning

confidence: 99%

Impaired Induction of the Jasmonate Pathway in the Rice Mutant hebiba

et al. 2003

Self Cite

View full text Add to dashboard Cite

The elongation of rice (Oryza sativa) coleoptiles is inhibited by light, and this photoinhibition was used to screen for mutants with impaired light response. In one of the isolated mutants, hebiba, coleoptile elongation was stimulated in the presence of red light, but inhibited in the dark. Light responses of endogenous indolyl-3-acetic acid and abscisic acid were identical between the wild type and the mutant. In contrast, the wild type showed a dramatic increase of jasmonate heralded by corresponding increases in the content of its precursor o-phytodienoic acid, whereas both compounds were not detectable in the mutant. The jasmonate response to wounding was also blocked in the mutant. The mutant phenotype was rescued by addition of exogenous methyl jasmonate and o-phytodienoic acid. Moreover, the expression of O. sativa 12-oxophytodienoic acid reductase, an early gene of jasmonic acid-synthesis, is induced by red light in the wild type, but not in the mutant. This evidence suggests a novel role for jasmonates in the light response of growth, and we discuss a cross-talk between jasmonate and auxin signaling. In addition, hebiba represents the first rice mutant in which the induction of the jasmonate pathway is impaired providing a valuable tool to study the role of jasmonates in Graminean development.

show abstract

“…Light-induced changes in transport correlate well with rapid changes in stem elongation (Furuya et al, 1969;Jones et al, 1991), and more gradual developmental changes, including vascular differentiation, have been shown to be regulated by auxin transport (Jacobs, 1979;Ruegger et al, 1997; see also introduction in Carland and McHale, 1996). However, auxin transport itself has been described as developmentally regulated (Jacobs, 1979).…”

mentioning

confidence: 99%