不同氮素营养条件下内生真菌感染对黑麦草光合和蒸腾速率及生物量的影响

以黑麦草(Lolium perenne L)为实验材料,研究在不同氮素营养条件下内生真菌(Neotyphodium lolii)感染对其光合特性及生物量的影响.结果表明:1)整个实验中,内生真菌感染对黑麦草净光合速率、蒸腾速率以及水分利用效率均无显著影响,但在中氮和高氮水平时,感染种群的净同化累积值有超过非感染种群的趋势;2)在本实验的第一处理期和第二处理期,内生真菌感染对黑麦草绿色部分的干物质产量无显著影响,但在第三处理期感染种群的绿色部分的干物质产量显著高于非感染种群.

Effects of Endophyte Infection on Photosynthesis,Transpiration and Biomass of Lolium perenne L.at Different Nitrogen Levels

In order to investigate the effect of endophyte infection on its host plants, net photosyn-thetic rate, transpiration rate, water using efficiency and dry mass yield were determined usingendophyte-infected (EI) and endophyte-free (EF) populations of Lolium perenne L. at different nitro-gen levels. There were no significant differences between EI and EF populations in net photosyn-thetic rate,transpiration rate or water using efficiency during the experimental period but the cumu-lative value of diurnal photosynthesis was greater in EI populations than in EF populations both atthe medium and at high nitrogen level. No significant differences existed between EI and EF popula-tions in dry mass yield of the herbage during the first or the second experimental period. During thethird experimental period, the dry wass of the EI populations was significantly higher than the EFpopulations.