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Responses to drought stress in Prunus sargentii and Larix kaempferi seedlings using morphological and physiological parameters
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.foreco.2020.118099 Narayan Bhusal , Minsu Lee , Ah Reum Han , Areum Han , Hyun Seok Kim
Forest Ecology and Management ( IF 3.7 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.foreco.2020.118099 Narayan Bhusal , Minsu Lee , Ah Reum Han , Areum Han , Hyun Seok Kim
Abstract The frequency and severity of drought are expected to increase due to climate change; therefore, drought tolerance of tree species should be considered before planting for maximal survival in the field. In this study, we examined the response of drought stress in two of the most popular plantation species: Sargent cherry (Prunus sargentii) and Japanese larch (Larix kaempferi) based on the morphological and physiological characteristics. These plantation species are widely planted in central and northern Asia, especially in Japan and Korea, and also widely used for plantation purpose in northern Europe. Three different irrigation regimes of control (CT; 100% precipitation (P)), light drought (LD; 40% reduction of P), and heavy drought (HD; 80% reduction of P) were applied at the experimental site of Mt. Jiri, the Republic of Korea. For morphological responses, both species experienced a significant decrease in leaf size in drought conditions; however, Sargent cherry and Japanese larch experienced reduced leaf width and length, respectively. On the other hand, leaf mass area (LMA, g cm−2) increased and branch growth decreased in both species under drought conditions. As physiological responses, drought stress significantly decreased maximum photosynthesis rate (Amax) and electron transfer rate (Jmax) for both species, while stomatal conductance (Gs) at Amax significantly decreased only in Sargent cherry. Drought significantly reduced predawn (ΨPD), midday leaf water potential (ΨMD), and transpiration in Sargent cherry but not in Japanese larch. In mid-summer, carbon isotopic composition (δ13C) significantly decreased in Sargent cherry but only showed a reduction tendency in Japanese larch. However, the changes of δ13C were not significant in early summer or mid-fall. In the present study, both species showed isohydric and anisohydric characteristics, but Sargent cherry showed greater anisohydric behavior with a steeper slope (Y = 2.132X) and Japanese larch showed more isohydric behavior with a shallower slope (Y = 1.722X). Our results highlight that both species altered their morphological and physiological responses under drought stress; however, the Japanese larch showed greater resistance and resilience in morphological and physiological responses, and in plant-water relations. Therefore, Japanese larch would be more beneficial for plantations in water deficit regions than Sargent cherry.
中文翻译:
使用形态和生理参数对 Prunus sargentii 和 Larix kaempferi 幼苗干旱胁迫的响应
摘要 由于气候变化,干旱的频率和严重程度预计将增加;因此,在种植前应考虑树种的耐旱性,以在田间获得最大存活率。在这项研究中,我们根据形态和生理特征检查了两种最受欢迎的种植园物种:萨金特樱桃 (Prunus sargentii) 和日本落叶松 (Larix kaempferi) 对干旱胁迫的响应。这些人工林品种广泛种植于中亚和北亚,特别是日本和韩国,在北欧也广泛用于人工林。在山的实验地点应用了三种不同的控制灌溉制度(CT; 100%降水(P)),轻度干旱(LD; P减少40%)和重干旱(HD; P减少80%)。大韩民国吉日。对于形态学反应,这两个物种在干旱条件下的叶片大小均显着减小;然而,萨金特樱桃和日本落叶松的叶子宽度和长度分别减少。另一方面,在干旱条件下,两个物种的叶质量面积(LMA,g cm−2)增加,枝条生长减少。作为生理反应,干旱胁迫显着降低了两个物种的最大光合作用速率 (Amax) 和电子转移速率 (Jmax),而 Amax 的气孔导度 (Gs) 仅在萨金特樱桃中显着降低。干旱显着降低了萨金特樱桃的黎明前 (ΨPD)、正午叶水势 (ΨMD) 和蒸腾作用,但在日本落叶松中则没有。仲夏之际,碳同位素组成(δ13C)在萨金特樱桃中显着降低,但在日本落叶松中仅显示出降低趋势。而δ13C的变化在初夏或中秋并不显着。在本研究中,两个物种都表现出等水和非等水特征,但萨金特樱桃表现出更大的等水行为,斜率更陡 (Y = 2.132X),日本落叶松表现出更多的等水行为,斜率更小 (Y = 1.722X)。我们的研究结果强调,这两个物种在干旱胁迫下都改变了它们的形态和生理反应;然而,日本落叶松在形态和生理反应以及植物-水分关系方面表现出更大的抵抗力和恢复力。因此,日本落叶松比萨金特樱桃更有利于缺水地区的种植园。
更新日期:2020-06-01
中文翻译:
使用形态和生理参数对 Prunus sargentii 和 Larix kaempferi 幼苗干旱胁迫的响应
摘要 由于气候变化,干旱的频率和严重程度预计将增加;因此,在种植前应考虑树种的耐旱性,以在田间获得最大存活率。在这项研究中,我们根据形态和生理特征检查了两种最受欢迎的种植园物种:萨金特樱桃 (Prunus sargentii) 和日本落叶松 (Larix kaempferi) 对干旱胁迫的响应。这些人工林品种广泛种植于中亚和北亚,特别是日本和韩国,在北欧也广泛用于人工林。在山的实验地点应用了三种不同的控制灌溉制度(CT; 100%降水(P)),轻度干旱(LD; P减少40%)和重干旱(HD; P减少80%)。大韩民国吉日。对于形态学反应,这两个物种在干旱条件下的叶片大小均显着减小;然而,萨金特樱桃和日本落叶松的叶子宽度和长度分别减少。另一方面,在干旱条件下,两个物种的叶质量面积(LMA,g cm−2)增加,枝条生长减少。作为生理反应,干旱胁迫显着降低了两个物种的最大光合作用速率 (Amax) 和电子转移速率 (Jmax),而 Amax 的气孔导度 (Gs) 仅在萨金特樱桃中显着降低。干旱显着降低了萨金特樱桃的黎明前 (ΨPD)、正午叶水势 (ΨMD) 和蒸腾作用,但在日本落叶松中则没有。仲夏之际,碳同位素组成(δ13C)在萨金特樱桃中显着降低,但在日本落叶松中仅显示出降低趋势。而δ13C的变化在初夏或中秋并不显着。在本研究中,两个物种都表现出等水和非等水特征,但萨金特樱桃表现出更大的等水行为,斜率更陡 (Y = 2.132X),日本落叶松表现出更多的等水行为,斜率更小 (Y = 1.722X)。我们的研究结果强调,这两个物种在干旱胁迫下都改变了它们的形态和生理反应;然而,日本落叶松在形态和生理反应以及植物-水分关系方面表现出更大的抵抗力和恢复力。因此,日本落叶松比萨金特樱桃更有利于缺水地区的种植园。