Endogenous Rhythmicity of Ethylene Production in Growing Intact Cereal Seedlings

Abstract

Ethylene evolution from etiolated barley (Hordeum vulgare), wheat (Triticum aestivum), and rye (Secale cereale) seedlings during coleoptile growth followed a rhythmic pattern, with a period of about 16 h for barley and wheat and 12 h for rye seedlings. Leaf emergence disturbed the established rhythm of ethylene evolution.

Spatial Distribution of Ethylene Production by Individual Needles Along a Shoot ofPinus sylvestrisL.: Relationship with Peroxidase Activity

“…We found variability in ethylene production : (1) between individual pairs of needles within individual pine seedlings ; and (2) between individual pine seedlings. Data on variability of mean ethylene production between individual pine seedlings are in accordance with earlier results with Pinus taeda seedlings (Telewski, 1990) and those with cereal seedlings (Ievinsh and Kreicbergs, 1992). In both cases the variation in ethylene production by individual plants was not due to variation in environmental conditions but rather depended on genetical (Telewski, 1990) or endogenous factors (Ievinsh and Kreicbergs, 1992).…”

“…Data on variability of mean ethylene production between individual pine seedlings are in accordance with earlier results with Pinus taeda seedlings (Telewski, 1990) and those with cereal seedlings (Ievinsh and Kreicbergs, 1992). In both cases the variation in ethylene production by individual plants was not due to variation in environmental conditions but rather depended on genetical (Telewski, 1990) or endogenous factors (Ievinsh and Kreicbergs, 1992). With respect to observed variability of ethylene production between individual needle pairs within a shoot, it should be pointed out that individual pairs cannot be treated as physiologically independent subunits.…”

Photoperiod Control of Gibberellin Levels and Flowering in Sorghum1

“…Ethylene has been shown to be produced in rhythmic, often diurnal pulses in a number of studies (Lipe and Morgan, 1973;Rikin et al, 1984;Morgan et al, 1990;Ievinsh and Kreicbergs, 1992;Machácková et al, 1997). However, the observations on GA 20 and GA 1 are the first, to our knowledge, in which the rhythmic levels of hormones have been observed in a context that suggests a possible linkage with both a physiological process (promotion of floral initiation) and a regulatory mechanism (phytochrome perception of daylength) (Talon et al, 1991;Foster and Morgan, 1995).…”

Diurnal Fluctuations in Ethylene Formation in Chenopodium rubrum

“…Severa1 plants (Vicia, Kalanchoe, and Cal tha) have been reported to exhibit diurnal variations of ethylene formation (Kapuya and Hall, 1977). Endogenous rhythms of ethylene formation have been observed in cotton grown under CL (Rikin et al, 1984) and in etiolated barley, wheat, and rye seedlings grown under both CL and CD (Ievinsh and Kreicbergs, 1992). The aim of this work was to determine if an endogenous or diurnal rhythmicity in ethylene production exists in C. vubrum and to investigate which step of ethylene biosynthesis is regulated by the photoperiod.…”