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Adventitious root formation in relation to irradiance and auxin supply

  • Original Paper
  • Published:
Biologia Plantarum

Abstract

High irradiance during treatment of mung bean cuttings favours root formation in response to supplied auxin, whether the latter is IAA or IBA. On the other hand it is inhibitory towards root formation in the absence of supplied auxin. Light promotes the uptake of14C-IAA into cuttings and its upward movement into the leaves. When14C-IAA is applied to leaves of cuttings high irradiance favours movement of radioactivity into the epicotyl and hypocotyl. This movement is also enhanced by concomitant supply of IBA to the base of the cuttings. The irradiance under which stock plants are raised also affects the extent of root formation on cuttings. When cuttings are held in darkness without a supply of exogenous auxin they root best if prepared from seedlings raised under high irradiance. However, transport of14C-IAA out of leaves of cuttings is favoured when cuttings are prepared from seedlings grown under low irradiance. These observations are discussed in relation to auxin transport, photodestruction and, possibly, metabolism.

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Authors and Affiliations

  1. Department of Botany, University of Sheffield, S10 2TN, Western Bank, Sheffield, UK

    B. C. Jarvis & A. I. Shaheed

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  1. B. C. Jarvis
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  2. A. I. Shaheed
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Jarvis, B.C., Shaheed, A.I. Adventitious root formation in relation to irradiance and auxin supply. Biol Plant 29, 321–333 (1987). https://doi.org/10.1007/BF02886608

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  • DOI: https://doi.org/10.1007/BF02886608

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