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Abstract Detail


Plant Development / Développement des plantes (CBA/ABC)

Alikpala, Earl [1], Chan, Timmie [1], Pettersson, Ryan [2], Mehroke, Jarnail [2], Singh, Santokh [2].

Physiological studies of leaf senescence, gas exchange rate, and protein profiles in Western Red Cedar (Thuja plicata) leaves.

Major plant physiological processes: gas exchange rates, protein profiles and leaf senescence are regulated by both external (environmental and seasonal) and internal (hormonal) factors. The objectives of this investigation were: (i) to investigate the role of plant hormones in leaf senescence in Western Red Cedar (Thuja plicata) and (ii) to study seasonal changes in photosynthesis and transpiration rates and protein profiles of Western Red Cedar leaves. One-year-old seedlings and excised leaves of mature Western Red Cedar trees were treated with plant hormones and growth regulators: jasmonic acid, abscisic acid, ethephon and benzylamino purine in both light and darkness. Jasmonic acid was the most effective hormone in the induction of leaf senescence in Western Red Cedar. Jasmonic acid treatments (0.1 and 1 mM) also reduced the levels of rubisco and ATP synthase proteins in excised leaves. In addition, seasonal changes in photosynthesis and transpiration rates of Western Red Cedar leaves will be discussed in relation to the levels of rubisco, ATP synthase and dehydrin proteins.


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1 - University of British Columbia, Botany, #3529 – 6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
2 - University of British Columbia, Botany, #3529 - 6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada

Keywords:
Western Red Cedar
Transpiration
Photosynthesis
senescence
jasmonic acid.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM
Number: PPA006
Abstract ID:831


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