Response of southern magnolia to supraoptimal root-zone temperatures

Chris Martin, Dewayne L. Ingram, Matthew A. Jenks

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

1. 1.|Rooted cuttings of southern magnolia (Magnolia grandiflora Hort. 'St. Mary') were exposed for 6 h daily to root-zone temperatures (RZT) of 28, 35 or 42°C for 8 weeks during the spring or fall of 1988. 2. 2.|Length of survival for 8-month old rooted cuttings was shortened when roots were exposed during the spring to 42 or 35°C compared to 28°C. Survival of 13-month old trees was unaffected by RZT treatments applied during the fall. 3. 3.|Electrolyte leakage from excised root tissue exposed for 30 min to temperatures ranging from 25 to 70°C, was used to assess cellular injury of 13-month old rooted cuttings after RZT treatments. 4. 4.|The critical killing temperatures (CT50) of root tissue pretreated at 28, 35 or 42°C RZT were 52.5 ± 0.9°C, 54.0 ± 0.4°C, respectively, and indicated differences in root membrane thermostability. 5. 5.|In another experiment, histological and scanning electron microscopy studies showed the proliferation of cells that was probably a callus response to temperature-mediated root injury induced by 38 or 42°C RZT after 20 or 8 days, respectively.

Original languageEnglish (US)
Pages (from-to)281-285
Number of pages5
JournalJournal of Thermal Biology
Volume16
Issue number5
DOIs
StatePublished - Sep 1991

Keywords

  • Direct heat injury
  • Magnolia grandiflora
  • growth anomalies
  • membrane thermostability

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Agricultural and Biological Sciences(all)
  • Developmental Biology

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