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Photosynthetic characteristics of Bothriochloa ischaemum under drought stress and elevated
Authors
冀智清
刘国彬
+3 more
张昌胜
张超
薛萐
Publication date
1 January 2012
Publisher
Abstract
采用盆栽控制试验,研究了黄土丘陵区乡土种白羊草在不同水分水平(80%FC和40%FC)和CO2浓度(375和750μmol·m-2·s-1)处理下的光合生理变化特征.结果表明:干旱胁迫使白羊草的最大净光合速率(Pnmax)、表观量子效率(AQE)、气孔导度(gs)、蒸腾速率(Tr)、最大光化学效率(Fv/Fm)、潜在光化学效率(Fv/Fo)和光合色素含量降低,丙二醛(MDA)和脯氨酸(Pro)含量升高.水分充足条件下,与正常大气CO2浓度相比,大气CO2浓度倍增下白羊草的Pnmax、MDA和Pro含量无显著差异.干旱胁迫下,CO2浓度升高提高了白羊草的最大荧光(Fm)、Fv/Fm、Fv/Fo、叶绿素含量和AQE,Pnmax比正常CO2浓度下高23.3%,差异达到显著水平,而MDA和Pro含量均显著降低.CO2浓度升高对干旱胁迫引起的白羊草光合能力下降有一定的补偿作用,减轻了干旱胁迫对白羊草的伤害.</span
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018