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Abstract Detail



Biotic and abiotic stress

Abdulmajeed, Awatif [1], Qaderi, Mirwais [2].

Aerobic methane emissions from pea plants: Inter-organ and inter-position variations.

Earlier studies have shown that aerobic methane (CH4) emission from plants increases under environmental stress conditions. The interactive effects of multiple environmental stress factors, such as temperature, ultraviolet-B (UVB) radiation and watering regime, on CH4 emission have received little attention. We determined methane emission rates from leaf and stem of different parts of shoot (upper, middle, and lower) in pea plants. Pea plants (Pisum sativum L. var. 237J Sundance) were grown under two temperature regimes (22/18oC and 28/24oC; 16/8h, light/dark), two levels of UVB radiation [0 (zero) and 5 (ambient) kJ m−2 d−1] and two watering regimes (well watered and water stressed). Plant parts were incubated under higher temperature regime at ambient UVB for two hours and CH4 emission rates were measured. Our preliminary results have shown that higher temperatures and ambient UVB increased CH4 emission, but water stress did not. Methane emission rates were higher from the stem than from the leaf. There were no differences in CH4 emission rates among leaf from different shoot parts. Methane emission rates were higher from the upper part of the stem than the other parts. Higher temperature increased, but ambient UVB decreased, the concentration of chlorophyll. Although temperature, UVB radiation or watering regime, as individual factors, did not affect the concentration of flavonoids, their three-way interaction had significant effect. The concentration of flavonoids was highest for the water-stressed plants grown under higher temperatures at ambient UVB and lowest for the well-watered plants grown under the same temperature regime at zero UVB.


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1 - Dalhousie University, Biology, Halifax, NS, B3H 4R2, Canada
2 - Mount Saint Vincent University, Biology, Halifax, NS, B3M 2J6, Canada

Keywords:
Methane
Pisum sativum
temperature stress
ultraviolet-B
Water stress.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PBA004
Abstract ID:508
Candidate for Awards:CSPB President's Award for Best Student Presentation


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