条锈菌侵染对小麦光合作用和呼吸作用速率的影响

 小麦幼苗叶片受到条锈菌侵染后,净光合速率降低,显症和产孢以后剧烈下降,变化幅度可达健株正常值的50%左右。病株光呼吸速率和暗呼吸速率在侵染初期略有降低,显症和产孢以后急剧上升,光呼吸速率升高幅度可达健株正常值的60-70%,暗呼吸速率可比健株升高1.6-1.7倍以上。随着小麦和条锈菌两者亲和性的增强,上述变化起始略晚,但变化幅度增大。文中讨论了上述病理学变化的意义。

EFFECTS OF STRIPE RUST INFECTION ON PHOTOSYNTHESIS AND RESPIRATION OF WHEAT

The first leaves of wheat cultivars Lovrin 13 and Huixianhong were heavily inoculated with several races of stripe rust.Changes in photosynthe-sis,photorespiration and dark respiration during infection process were mea-sured in inoculated leaves with FOW infrared gas analyser.Net photosynthesis rate declined slightly in the initial stage of infection and rapidly increased by about 50% in the stage of symptom appearing and pustule formation.Respiration remarkably increased in the late stage of infection,following an initial decline.Photorespiration rate in infected leaves rose to 60-70% and dark respiration rate rose to 1.6-1.7 times that of health leaves.The duration and degree of these changes were dependant on the degree of incompatibility between host and stripe rust.The significance of these results was disscused,