Journal Article

Physiology and anatomy of lenticel-like structures on leaves of <i>Eucalyptus nitens</i> and <i>Eucalyptus globulus</i> seedlings

Elizabeth Pinkard, Warwick Gill and Caroline Mohammed

in Tree Physiology

Volume 26, issue 8, pages 989-999
Published in print August 2006 | ISSN: 0829-318X
Published online August 2006 | e-ISSN: 1758-4469 | DOI:
Physiology and anatomy of lenticel-like structures on leaves of Eucalyptus nitens and Eucalyptus globulus seedlings

More Like This

Show all results sharing this subject:

  • Plant Sciences and Forestry


Show Summary Details


Intumescences or abnormal, non-pathogenic, blister-like protuberant growths, form on Eucalyptus globulus Labill. and, to a much lesser extent, Eucalyptus nitens (Deane and Maiden) Maiden leaves when plants are grown in a high relative humidity environment. We examined the histology of intumescences and their effects on leaf photosynthetic processes. Intumescences were induced by placing E. globulus and E. nitens seedlings in a relative humidity of 80% in a greenhouse for 5 days. Symptomatic and asymptomatic leaves of plants with intumescence development were compared with leaves of control plants. Light-saturated carbon dioxide (CO2) assimilation (Amax) and responses of CO2 assimilation (A) to varying intercellular CO2 partial pressure (Ci) were measured. Symptomatic and asymptomatic leaf samples were fixed and sectioned and cellular structure was examined. Intumescences greatly reduced the photosynthetic capacity of E. globulus leaves and were associated with reduced electron transport rate and ribulose bisphosphate (RuBP) regeneration capacity. Tissue necrotization and cellular collapse of the palisade mesophyll and deposition of phenolic compounds in the affected areas, probably reduced light penetration to photosynthesizing cells as well as reducing the amount of photosynthesizing tissue. Photosynthetic capacity of E. nitens was unaffected. The intumescences resembled simple lenticels, both morphologically and developmentally. To our knowledge, this is the first time that lenticel-like structures developed in response to environmental conditions have been described on leaves.

Keywords: CO2 assimilation; electron transport; histology; intumescence; oedema; RuBP

Journal Article.  0 words. 

Subjects: Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.