Control by light of hypocotyl growth in de-etiolated mustard seedlings : II. Sensitivity for newly-formed phytochrome after a light to dark transtition.
作者： A Wildermann , H Drumm , E Schäfer , H Mohr
DOI: 10.1007/BF00387892
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摘要: After sowing, mustard (Sinapis alba L.) seedlings were grown for 48 h in white light (25°C). These fully de-etiolated, green used as experimental material between and 72 after sowing to study the control by phytochrome (Pfr) of hypocotyl elongation a light→dark transition. It was found that transfer darkness leads complete loss sensitivity towards newlyformed Pfr period 12 while effectiveness Pfr, which established at end pretreatment maintained. is concluded two kinds must be kept apart: "old" operates during first transition "new" appearance totally ignored plant. Between 24 seedling restored an effect no longer detectable. The restoration process accelerated through ("positive feedback"). implications these findings plant growth under natural light/dark regimes are discussed.
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