黄连花的光合日变化及干旱对其光合特性的影响
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摘要
为了明确黄连花(Lysimachia davurica)的光合特性,揭示干旱胁迫对黄连花生长和光合作用的影响机理,以黄连花幼苗为材料,采用LI-6400便携式光合仪测定了自然条件下的光合日变化以及自然干旱5、10和15 d的光响应曲线。结果表明,自然条件下,黄连花净光合速率(P_n)在一天中呈"单峰"型变化, 14:00时达到最大值[9.18μmol·(m~2·s)~(-1))],无"午休"现象。与自然条件相比,干旱胁迫下,黄连花的净光合速率(P_n)、气孔导度(G_s)和蒸腾速率(T_r)降低,胞间CO_2浓度(C_i)升高,表观量子效率(AQE)降低,光补偿点(LCP)增加,光饱和点(LSP)先增加后减小,且净光合速率在胁迫15 d时降为负值,说明黄连花的抗旱能力一般,可以承受10 d的干旱胁迫。
This study aimed to clarify the photosynthetic characteristics of Lysimachia davurica under natural conditions and drought stress conditions. The diurnal variation in photosynthesis under natural conditions, and the light response curve under natural drought conditions for 5, 10, and 15 days, were measured using a LI-6400 portable photosynthetic apparatus with young seedlings of Lysimachia davurica used as samples. The results showed that the net photosynthetic rate(Pn) of Lysimachia davurica appeared to have an "unimodal" pattern that lacked a "midday depression" on one day, which reached a peak of 9.18 μmol·(m~2·s)~(-1) at 14:00. Under drought stress conditions, Pn, stomatal conductance(G_s), and transpiration rate(T_r) decreased, while the internal CO_2 concentration(C_i) increased. The apparent quantum efficiency(AQE) decreased and the light compensation point(LCP) increased. The light saturation point(LSP) initially increased and then decreased. In addition, the net photosynthetic rate decreased to a negative value at 15 days after the application of stress. This indicated that Lysimachia davurica is only weakly able to adapt to dry environments. It can withstand drought stress for up to 10 days.
This study aimed to clarify the photosynthetic characteristics of Lysimachia davurica under natural conditions and drought stress conditions. The diurnal variation in photosynthesis under natural conditions, and the light response curve under natural drought conditions for 5, 10, and 15 days, were measured using a LI-6400 portable photosynthetic apparatus with young seedlings of Lysimachia davurica used as samples. The results showed that the net photosynthetic rate(Pn) of Lysimachia davurica appeared to have an "unimodal" pattern that lacked a "midday depression" on one day, which reached a peak of 9.18 μmol·(m~2·s)~(-1) at 14:00. Under drought stress conditions, Pn, stomatal conductance(G_s), and transpiration rate(T_r) decreased, while the internal CO_2 concentration(C_i) increased. The apparent quantum efficiency(AQE) decreased and the light compensation point(LCP) increased. The light saturation point(LSP) initially increased and then decreased. In addition, the net photosynthetic rate decreased to a negative value at 15 days after the application of stress. This indicated that Lysimachia davurica is only weakly able to adapt to dry environments. It can withstand drought stress for up to 10 days.
引文
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[3]余叔文,汤章城.植物生理和分子生物学(第2版).北京:科学出版社,1999:262-276.YU S W,TANG Z C.Plant Physiology and Molecular Biology(Second Edition).Beijing:Science Press,1999:262-276.
[4]秦登,唐吕君,陈尧,蒋文伟.夏季高温环境下3个矾根品种的光合特性比较.西北林学院学报,2014,29(3):32-36.QIN D,TANG L J,CHEN Y,JIANG W W.Photosynthetic characteristics of three heuchera varieties at high temperature in summer.Journal of Northwest Forestry University,2014,29(3):32-36.
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[6]杨学军,武菊英,滕文军,袁小环.青绿苔草光合作用日变化及季节动态.草业科学,2014,31(1):102-107.YANG X J,WU J Y,TENG W J,YUAN X H.Daily and seasonal variation of photosynthetic characteristics of Carex leucochlora.Pratacultural Science,2014,31(1):102-107.
[7]张金政,张起源,孙国峰,何卿,李晓东,刘洪章.干旱胁迫及复水对玉簪生长和光合作用的影响.草业学报,2014,23(1):167-176.ZHANG J Z,ZHANG Q Y,SUN G F,HE Q,LI X D,LIU H Z.Effects of drought stress and re-watering on growth and photosynthesis of Hosta.Acta Prataculturae Sinica,2014,23(1):167-176.
[8]杨肖华,郭圣茂,冯美玲,赖晓莲,商靓婷.干旱胁迫及复水对射干光合作用和叶绿素荧光特性的影响.江西农业大学学报,2018,40(3):525-532.YANG X H,GUO S M,FENG M L,LAI X L,SHANG L T.Effects of drought stress and re-watering on photosynthesis and chlorophyll fluorescence characteristics of Blackberry lily.Acta Agriculturae Universitatis Jiangxiensis,2018,40(3):525-532.
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[13]田景奎,邹忠梅,刘安,徐丽珍,张宏武,穆红梅,杨世林.黄连花化学成分的研究(Ⅱ).中国中药杂志,2002,27(4):283.TIAN J K,ZOU Z M,XU A,XU L Z,ZHANG H B,MU H M,YANG S L.Studies on the Chemical constituents of Lysimachia davurica(Ⅱ).Chinese Journal of Traditional Chinese Medicine,2002,27(4):283.
[14]田景奎,邹忠梅,徐丽珍,刘建新,张宏武,杨世林.黄连花化学成分的研究(Ⅲ).中国药学杂志,2003,38(11):836-838.TIAN J K,ZOU Z M,XU L Z,LIU J X,ZHANG H W,YANG S L.Studies on the chemical constituents of Lysimachia davurica(Ⅲ).Chinese Pharmaceutical Journal,2003,38(11):836-838.
[15]孙冬玲.黄连花种子萌发及组织培养体系建立.哈尔滨:东北林业大学硕士学位论文,2014.SUN D L.Seed germination and tissue culture system establishment of Lysimachia davurica.Master Thesis.Harbin:Northeast Forestry University,2014.
[16]曲春香,奚惕,苗连山.黄莲花的组织培养及试管繁殖.植物生理学通讯,1990(2):42.QU C X,XI T,MIAO L S.Tissue culture and micro-propagation of Lysimachia vulgaris var.davurica.Plant Physiology Journal,1990(2):42.
[17]谭贵发,周子坤.长白山野生宿根花卉金丝桃、黄连花的驯化栽培与园林应用.吉林林业科技,2014,43(4):13-15.TAN G F,ZHOU Z K.Domesticated cultivation and landscape application of Hepericum ascyron and chinensis and Lysimachia davurica in Changbai Mountain.Journal of Jilin Forestry Science and Technology,2014,43(4):13-15.
[18]张彦妮,雷蕾,夏斌.干旱胁迫及复水对黄连花幼苗生长和生理特性的影响.草业科学,2016,33(9):1681-1689.ZHANG Y N,LEI L,XIA B.Effects of drought stress and rewatering on seeding growth and physiological characteristics of Lysimachia davurica.Pratacultural Science,2016,33(9):1681-1689.
[19]兰小中,廖志华,王景升.西藏高原濒危植物西藏巨柏光合作用日进程.生态学报,2005,12(12):3172-3175.LAN X Z,LIAO Z H,WANG J S.The diurnal course of photosynthesis of the endangered species Tibetan Cupressus gigantea in Tibet plateau.Acta Ecologica Sinica,2005,12(12):3172-3175.
[20]FARQUHAR G D,CAEMMERER S V.Modelling of photosynthetic response to environmental conditions.Physiological Plant Ecology II,1982(12):549-587.
[21]权红,兰小中.濒危植物大花黄牡丹光合特性及日进程研究.种子,2013,32(5):29-32,38.QUAN H,LAN X Z.Studies on photosynthetic characteristics and diurnal course of the endangered species Paeonia ludlowii.Seed,2013,32(5):29-32,38.
[22]任建武,王雁,彭镇华.3种温室栽培石斛冬季光合特性研究.西北林学院学报,2009,24(1):39-43.REN J W,WANG Y,PENG Z H.Characteristics of photosynthetic in three Dendrobium species cultivated in greenhouse during winter.Journal of Northwest Forestry University,2009,24(1):39-43.
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