J Integr Plant Biol. ›› 1979, Vol. 21 ›› Issue (3): -.

• Research Articles •    

Pathological Anatomy of the Leaves of Leaf-Blight Disease in Oryza sativa L.

Lee Cheng-lee, Zhang Xin-ying and Li Mao-xue   

Abstract: The leaf-blight bacteria (Xanthomonas oryzae Dawson) infect the leaves of the rice plant repeatedly, through the water pores at the forepart of the leaf blade. As the hydathode on top of the rice leaf-blade is not so conspicuous as that in the dicotyledons, such as Brassica, there is no reduced stoma on the summit of the leaf. However, many deformed stomata distributing irregularly at the forepart of the leaf are referred as water pores. These water pores being somewhat larger than the normal stomata are located very closely to the top and they become round by lateral bulging out. Besides, there are a few which are smaller than the stomata. After artificial inoculation by spraying with bacteria suspensions, the leaf-blight bacteria following the entrance through the water pores invaded the tracheids and spread over the veins and veinlets including the transverse veinlets connected between them. This kind of vein system facilitates the spreading of germs. At times the bac- teria may lodge in the immature tracheids or other parenchymatous cells. The development of disease with puncture inoculation was more rapid than that with spray inoculation. By way of puncture inoculation, it might or might not prick through the veins or veinlets, however, the course of proliferation in the vessels of various sizes of viens was basically similar to that of the spray inoculation.

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