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Leaf gas exchange and stable carbon isotope composition of redbay and avocado trees in response to laurel wilt or drought stress
Environmental and Experimental Botany ( IF 5.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.envexpbot.2019.103948 Raiza Castillo-Argaez , Bruce Schaffer , Aime Vazquez , Leonel D.S.L. Sternberg
Environmental and Experimental Botany ( IF 5.7 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.envexpbot.2019.103948 Raiza Castillo-Argaez , Bruce Schaffer , Aime Vazquez , Leonel D.S.L. Sternberg
Abstract Symptoms of laurel wilt, a vascular plant disease caused by the fungus Raffaelea lauricola, are similar to those of drought stress. We compared physiological responses of redbay and avocado trees infected with laurel wilt to responses of trees with drought stress. Trees were either inoculated with R. lauricola, subjected to drought stress, or irrigated daily and not inoculated (non-stressed, control). Disease symptoms, net CO2 assimilation (A), stomatal conductance of water vapor (gs), substomatal CO2 concentration (Ci), intrinsic water use efficiency (WUEi), leaf chlorophyll index (LCI), the ratio variable to maximum leaf chlorophyll fluorescence (Fv/Fm), leaf nitrogen (N) concentration, and the ratio of 13C to 12C (δ13C) in leaves were determined prior to inoculation and the imposition of drought stress and when plants showed moderate to severe stress symptoms. Laurel wilt-infected and drought-stressed trees of each species had lower A and gs and higher Ci, Fv/Fm, and LCI than non-stressed trees. Redbay trees with laurel wilt had significantly higher (less negative) leaf δ13C values than non-stressed trees, whereas no significant differences were found in leaf δ13C values among avocado treatments. In avocado trees with laurel wilt, there was a negative linear correlation between δ13C values and Ci but no significant correlation between δ13C values and leaf N in the inoculated trees. Inhibition of photosynthesis in avocado and redbay infected with laurel wilt was determined to be a result of the both stomatal and biochemical factors.
中文翻译:
红湾和鳄梨树对月桂枯萎或干旱胁迫响应的叶片气体交换和稳定碳同位素组成
摘要 月桂枯萎病是一种由 Raffaelea lauricola 真菌引起的维管植物病害,其症状与干旱胁迫的症状相似。我们比较了感染月桂枯萎病的红湾和鳄梨树的生理反应与干旱胁迫下树木的反应。树木要么接种月桂树,经受干旱胁迫,要么每天灌溉而不接种(非胁迫,对照)。疾病症状、净 CO2 同化 (A)、水蒸气的气孔导度 (gs)、亚气孔 CO2 浓度 (Ci)、内在水分利用效率 (WUEi)、叶绿素指数 (LCI)、可变与最大叶绿素荧光的比率 ( Fv/Fm), 叶氮 (N) 浓度, 在接种和施加干旱胁迫之前以及当植物表现出中度至重度胁迫症状时测定叶片中 13C 与 12C (δ13C) 的比率。与未受胁迫的树木相比,月桂枯萎病和干旱胁迫下的每个物种的树木都具有较低的 A 和 gs 以及较高的 Ci、Fv/Fm 和 LCI。具有月桂枯萎病的红湾树的叶片 δ13C 值显着高于未受胁迫的树木(负值较小),而鳄梨处理之间的叶片 δ13C 值没有发现显着差异。在月桂枯萎的鳄梨树中,δ13C 值与 Ci 之间存在负线性相关,但 δ13C 值与接种树的叶片 N 之间没有显着相关性。
更新日期:2020-03-01
中文翻译:
红湾和鳄梨树对月桂枯萎或干旱胁迫响应的叶片气体交换和稳定碳同位素组成
摘要 月桂枯萎病是一种由 Raffaelea lauricola 真菌引起的维管植物病害,其症状与干旱胁迫的症状相似。我们比较了感染月桂枯萎病的红湾和鳄梨树的生理反应与干旱胁迫下树木的反应。树木要么接种月桂树,经受干旱胁迫,要么每天灌溉而不接种(非胁迫,对照)。疾病症状、净 CO2 同化 (A)、水蒸气的气孔导度 (gs)、亚气孔 CO2 浓度 (Ci)、内在水分利用效率 (WUEi)、叶绿素指数 (LCI)、可变与最大叶绿素荧光的比率 ( Fv/Fm), 叶氮 (N) 浓度, 在接种和施加干旱胁迫之前以及当植物表现出中度至重度胁迫症状时测定叶片中 13C 与 12C (δ13C) 的比率。与未受胁迫的树木相比,月桂枯萎病和干旱胁迫下的每个物种的树木都具有较低的 A 和 gs 以及较高的 Ci、Fv/Fm 和 LCI。具有月桂枯萎病的红湾树的叶片 δ13C 值显着高于未受胁迫的树木(负值较小),而鳄梨处理之间的叶片 δ13C 值没有发现显着差异。在月桂枯萎的鳄梨树中,δ13C 值与 Ci 之间存在负线性相关,但 δ13C 值与接种树的叶片 N 之间没有显着相关性。