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Physiology and anatomy of lenticel-like structures on leaves of Eucalyptus nitens and Eucalyptus globulus seedlings

Citation

Pinkard, EA and Gill, WM and Mohammed, CL, Physiology and anatomy of lenticel-like structures on leaves of Eucalyptus nitens and Eucalyptus globulus seedlings, Tree Physiology, 26, (8) pp. 989-999. ISSN 0829-318X (2006) [Refereed Article]

DOI: doi:10.1093/treephys/26.8.989

Abstract

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 (CO 2) assimilation (A max) and responses of CO 2 assimilation (A) to varying intercellular CO 2 partial pressure (C i) 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. © 2006 Heron Publishing.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Forestry Sciences not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Other Plant Production and Plant Primary Products
Objective Field:Plant Production and Plant Primary Products not elsewhere classified
Author:Pinkard, EA (Dr Elizabeth Pinkard)
Author:Gill, WM (Dr Warwick Gill)
Author:Mohammed, CL (Professor Caroline Mohammed)
ID Code:39723
Year Published:2006
Web of Science® Times Cited:10
Deposited By:Agricultural Science
Deposited On:2006-08-01
Last Modified:2007-04-18
Downloads:0

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