Abstract/Details

Phenotypic variability and developmental rates affect the response of bean (Phaseolus vulgaris L.) plants to ozone


2004 2004

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Abstract (summary)

Tropospheric ozone is considered the most damaging gaseous air pollutant worldwide to which plants are exposed. Tissue injuries, reductions in plant growth and productivity, and changes in crop quality are some of the effects of ozone on plants. Ozone causes more damage to vegetation than all other air pollutants combined. The economic impacts of ozone on crop growth and productivity continue to be significant.

Over the past several decades, researchers have focused on quantifying ozone-related damage on plants and establishing methods to explain plants' reaction to ozone. Increasingly, however, it has been shown that plant species react to ozone in many different ways: some are excessively susceptible and their development suffers or is severely reduced; others adapt themselves to new environmental conditions and become more tolerant. In some cases, certain cultivars even show resistance.

The studies presented here focus on the impacts of ozone injury on the development of plants with varying degrees of sensitivity to ozone exposure and how growth rate and morphological characteristics affect plant responses to ozone at various concentrations. The degree of plant sensitivity to ozone was determined by comparative field studies, or by using open top field chambers where plants were exposed to ozone at various concentrations. In addition to crop yield evaluations from plants with differences in response to ozone, stomatal conductance was measured as a method of determining potential physiological changes. Stomatal density and aperture size were also assessed.

The present studies assess the relationship between morphological characteristics of ozone-sensitive and ozone-tolerant genotypes of bush bean (Phaseolus vulgaris L.) and ozone exposure under different environmental conditions. The results support the expectation that genotypes within same species may show differences in response to ozone. Morphological characteristics, especially that of leaves, seem to influence individual plant responses to various atmospheric treatments.

Indexing (details)


Subject
Botany;
Ecology;
Plant pathology
Classification
0309: Botany
0329: Ecology
0480: Plant pathology
Identifier / keyword
Biological sciences, Bean, Developmental rates, Ozone, Phaseolus vulgaris, Phenotypic variability
Title
Phenotypic variability and developmental rates affect the response of bean (Phaseolus vulgaris L.) plants to ozone
Author
Elagoz, Vahram
Number of pages
156
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/06, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Manning, William J.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3136724
ProQuest document ID
305176252
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305176252
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