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EVALUATION OF GROWTH AND GAS EXCHANGE RATES OF TWO LOCAL SAUDI WHEAT CULTIVARS GROWN UNDER HEAT STRESS CONDITIONS

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dc.contributor.author BOUTRAA, TAHAR
dc.contributor.author ABDELLAH AKHKHA
dc.contributor.author ABDUL KHALIQ AL-SHOAIBI
dc.date.accessioned 2022-12-21T04:16:56Z
dc.date.available 2022-12-21T04:16:56Z
dc.date.issued 2015-02-04
dc.identifier.citation Boutraa, T., Akhkha, A., & Al-Shoaibi, A. K. (2015). Evaluation of growth and gas exchange rates of two local saudi wheat cultivars grown under heat stress conditions. Pak. J. Bot, 47(1), 27-34. en_US
dc.identifier.issn 2070-3368
dc.identifier.uri http://142.54.178.187:9060/xmlui/handle/123456789/15410
dc.description.abstract The present study investigated the effects of three temperature regimes, low (20ºC), moderate (25ºC) and high (30ºC), on growth and physiological parameters of two local Saudi wheat (Triticum durum) cultivars, Hab-Ahmar and Algaimi. Plants were grown under controlled environment in growth chambers. After four weeks plants were harvested and the following growth parameters were measured; plant height, number of tillers, leaf area, root length, fresh and dry weight. Physiological traits include chlorophyll content, photosynthesis rates, stomatal conductance, dark respiration and chlorophyll fluorescence parameters; Fo, Fm and Fv/Fm. In cultivar Hab-Ahmar, moderate and high temperatures caused significant decrease in most growth and physiological parameters such as plant height, number of tillers, leaf area, fresh and dry weight, chlorophyll content, photosynthesis rates, stomatal conductance, dark respiration and the maximum quantum yield of photosystem II (Fv/Fm). In contrast, cv. Algaimi was shown to be more thermotolerant to moderate and high temperatures, with the exception of some growth parameters that were decreased. Unlike cultivar Hab-Ahmar, cultivar Algaimi had an increased rate of dark respiration when temperature was high (30ºC). Stomatal behavior is shown to be positively correlated with the rates of photosynthesis in both cultivars; however, in cultivar Hab-Ahmar such correlation decreased as temperature increased. en_US
dc.language.iso en en_US
dc.publisher Karachi: Pakistan Botanical Society en_US
dc.subject Thermotolerance en_US
dc.subject Wheat en_US
dc.subject Growth en_US
dc.subject Photosynthesis en_US
dc.subject Fluorescence en_US
dc.title EVALUATION OF GROWTH AND GAS EXCHANGE RATES OF TWO LOCAL SAUDI WHEAT CULTIVARS GROWN UNDER HEAT STRESS CONDITIONS en_US
dc.type Article en_US


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