水分胁迫对白羊草光合生理特性的影响

测定了白羊草(Bothriochloaischaemum)在黄土高原丘陵沟壑区大田干旱条件下叶片光合速率、叶片水势、叶绿素含量、气孔阻力、蒸腾强度、细胞膜透性和脯氨酸积累指标。结果表明:土壤干旱条件下,降低了白羊草叶水势、气孔蒸腾强度、光合速率和叶绿素含量,增加了叶片气孔阻力、细胞膜透性和脯氨酸的积累。解除水分胁迫、恢复供水48h后,上述各项指标可以恢复到正常供水值的50%以上,说明了白羊草自身调节能力强,对干旱有良好的适应性和忍耐性。

Effects of Moisture Stress on the Photosynthesis Physiological Characteristics in Bothriochloa ischaemum

In this paper, under the dry soil in tablelands, hills and gullies, that in Bothriochloa ischaemum were determined they were the photosynthesis rate, leaves water patential, chlorophyll containing, stomatal resistance, transpiration strength, cell membrance permeability and proline acidcontent accumulation. With the dry soil, the result showed that in Bothriochloa ischaemum leaves water patential, transpiration strength, photosynthesis rate and chlorophyll containing were lowered, the leaf"s stomatal resistance, cell membrance permeability and proline acidcontent accumulation were increased. By reliefing moisture stress and recovering water''s supplying during 48 hours, the various indexes that were researched can recover 50% of the normal water supplying. This showed Bothriochloa ischaemum has the strong ability of regulating itself, the adaptability and the patience to the dry soil.