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首页> 外文期刊>Pakistan journal of botany >EVALUATION OF GROWTH AND GAS EXCHANGE RATES OF TWO LOCAL SAUDI WHEAT CULTIVARS GROWN UNDER HEAT STRESS CONDITIONS
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EVALUATION OF GROWTH AND GAS EXCHANGE RATES OF TWO LOCAL SAUDI WHEAT CULTIVARS GROWN UNDER HEAT STRESS CONDITIONS

机译:在热胁迫条件下生长两种当地沙特小麦品种的生长和燃气汇率评价

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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 thefollowing 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 andchlorophyll fluorescence parameters; Fo, Fm and Fv/Fm. In cultivar Hab-Ahmar, moderate and high temperatures causedsignificant decrease in most growth and physiological parameters such as plant height, number of tillers, leaf area, fresh anddry weight, chlorophyll content, photosynthesis rates, stomatal conductance, dark respiration and the maximum quantumyield of photosystem II (Fv/Fm). In contrast, cv. Algaimi was shown to be more thermotolerant to moderate and hightemperatures, with the exception of some growth parameters that were decreased. Unlike cultivar Hab-Ahmar, cultivarAlgaimi had an increased rate of dark respiration when temperature was high (30oC). Stomatal behavior is shown to bepositively correlated with the rates of photosynthesis in both cultivars; however, in cultivar Hab-Ahmar such correlationdecreased as temperature increased.
机译:本研究研究了三个温度制度,低(20oC),中等(25oC)和高(30oC)的影响,对两种地方沙特小麦(Triticum)品种,HAB-Ahmar和Algaimi.plants的生长和生理参数进行了影响在生长室的受控环境下生长。收获四周后,测量植物并测量义的生长参数;植物身高,分蘖数,叶面积,根长,新鲜干重。物理性状,包括叶绿素含量,光合速率,气孔电导,暗呼吸和氯乙烯荧光参数; FO,FM和FV / FM。在品种hab-ahmar中,中度和高温导致植物高度和生理参数减少,如植物身高,分蘖数,叶面积,新鲜重量,叶绿素含量,光合速率,气孔电导,暗呼吸和最大量子(最大量子)光照系统II(FV / FM)。相比之下,cv。 Algaimi被证明更热透热至中等和高高,除了一些减少的生长参数外。与品种HAB-AHMAR不同,当温度高(30oC)时,培养良好呼吸速度增加。表明气孔行为与两种品种的光合作用率有关相关;然而,在品种hab-ahmar中,随着温度的增加,这种相关性并增加了。

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