Phytochrome-controlled level of growth substances in etiolated oat seedlings
نویسندگان
چکیده
منابع مشابه
Distribution of Phytochrome in Etiolated Seedlings.
'I'lle l)lalt p)ignent, phytochrome regulates a large numl)er of l)hysiological processes in higher plaints (14). T'he pigment is nmost readily detected in darkgrown see(llings both because it is normally present in higher conlcenitrationis than in light-grown seedlinigs (8, 11), and because dark-grown seedlinigs contain only smlall amounts of other pigments absorbing ligfit ini the same spectr...
متن کاملPhytochrome control of two low-irradiance responses in etiolated oat seedlings.
Light-induced coleoptile stimulation and mesocotyl suppression in etiolated Avena sativa (cv. Lodi) has been quantitated. Etiolated seedlings showed the greatest response to light when they were illuminated 48 to 56 hours after imbibition. Two low-irradiance photoresponses for each tissue have been described. Red light was 10 times more effective than green and 1,000 times more effective than f...
متن کاملEvidence for bound phytochrome in oat seedlings.
Phytochrome is consistently observed in pellets centrifuged from homogenates of etiolated, 5-day-old oat seedlings. The majority of pigment associated with the pellet cannot be removed by buffer washes, nor can appreciable quantities of additional phytochrome be adsorbed onto the sedimented material. Over 70% of phytochrome in the pellet is released by 1% Triton X-100.Storage at 0 degrees , irr...
متن کاملPhytochrome changes correlated to mesocotyl inhibition in etiolated Avena seedlings.
The elongation of etiolated Avena mesocotyls is inhibited by red light (660 mmu). Immediately after exposing mesocotyl sections to varying doses of red light the ensuing concentrations of phytochrome in the far-red absorbing form (P(730)) were measured. The extent of mesocotyl inhibition observed 5 days later is proportional to the logarithm of P(730) concentration in mesocotyl tissue at the ti...
متن کاملPartial Purification and Characterization of a Phytochrome-degrading Neutral Protease from Etiolated Oat Shoots.
A factor catalyzing the in vitro degradation of oat phytochrome in crude extracts has been shown to be a proteolytic enzyme. The enzyme, an endoprotease, has been purified about 600-fold from dark-grown oat shoots by chromatography on ion exchange and molecular seive gels. The pH-activity curve is broad, with a maximum around pH 6.4. The enzyme is apparently dependent on the presence of reduced...
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ژورنال
عنوان ژورنال: Acta Societatis Botanicorum Poloniae
سال: 2014
ISSN: 2083-9480
DOI: 10.5586/asbp.1992.033