排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
MAO ZHONGYUAN; CRAKER LYLE E.; DECOTEAU DENNIS R. 《Journal of experimental botany》1989,40(11):1273-1277
Light control of leaf abscission in Coleus (Coleus blumei Benthcv. Ball 2719 Red) appears to be regulated by the quantity ofendogenous auxin transported from the leaf blade to the abscissionzone. Gas chromatographicmass spectrophotometric analysisindicated that diffusate collected from leaf tissue treatedwith red light contained significantly higher levels of auxinthan dark and far-red light-treated leaf tissue. In addition,diffusate from red light-treated tissue inhibited abscissionof leafless petioles while diffusate from far-red light-treatedtissue promoted abcission when compared with diffusate fromdark-treated tissue. The effect of red light on abscission couldbe mimicked by IAA, but not by other phytohormones. An auxintransport inhibitor, 2, 3, 5-triiodobenzoic acid (TIBA), appliedeither as a lanolin ring around the petiole or vacuum infiltratedinto tissue, could completely eliminate any red light effecton abscission. The data are consistent with a phytochrome-mediatedlight regulation of endogenous auxin level in the leaf whichthen controls abscission. Key words: Abscission, Coleus, IAA, plant hormones, red (far-red) light, TIBA 相似文献
2.
CRAKER LYLE E.; ZHAO SHU YING; DECOTEAU DENNIS R. 《Journal of experimental botany》1987,38(5):883-888
Craker, L. E., Zhao, S. Y. and Decoteau, D. R. 1987. Abscission:response to red and far-red light.J. exp. Bot. 38: 883888. The dose-response and time relationship of red and far-red lightin the inhibition and promotion, respectively, of dark-inducedleaf abscission was quantified using cuttings of coleus (ColeusBlumei Benth.). A continuous photon flux of approximately 15nM m2 s1 of red light was sufficient to preventleaf abscission. Abscission was promoted by exposure to a photonflux of approximately 10 nM m2 s1 of far-red lightThe inhibition of abscission by red light could be reversedby treatment with far-red and the promotion of abscission byfar-red light could be reversed by treatment with red lightThe data were consistent with a phytochrome receptor systemlocated in the leaves that controlled the presence of an abscission-inhibitingsubstance in the abscission zones. Key words: Abscission, Coleus Blumei, far-red light red light 相似文献
3.
Plants of radish (Raphanus sativus L.) were grown under selectedlight conditions in controlled environmental chambers in orderto monitor the role of photoperiod, irradiance level and inputlight energy in plant development. Results indicated that thedaily input of light energy was the most important light factoraffecting leaf development while photoperiod and irradiancelevel had the major influences on storage organ development.Distribution of assimilates to leaves and storage organs variedunder different light regimes with long photoperiods and highirradiances producing the largest storage organs. Once initiated,the rate of storage organ growth was similar under all testedlight environments. Raphanus sativus L., radish, growth, development, light, photoperiod, assimilate distribution, storage organ 相似文献
1