Vol. 6, Issue 2 (2018)
Studies on variability of Rhizoctonia solani isolated from different hosts and its virulence on rice crop
Author(s): Rajeshwari Divya, RK Dantre and AS Kotasthane
Abstract: The cultural and morphological features of Rhizoctonia solani were studied on growing them on PDA medium which was isolated from different host viz. rice, soybean, moongbean groundnut and maize. Five field isolates are characterized for cultural and morphological characteristics on PDA medium under in vitro condition. The isolates varied with respect to growth, colony characteristics and sclerotial morphology and it was found that the rice isolate was submerged to subdued type while the soybean and moongbean isolates produced aerial mycelium with strandy and subdued growth, and it was strandy and subdued in maize and groundnut isolate produced strandy and subdued mycelium. Various shades of dark brown mature sclerotia were observed in rice, soybean, moongbean whereas groundnut and maize isolates produced very dark greyish colored sclerotia. Marked differences in the shape and size of sclerotia were observed by the isolates of different hosts. In rice isolate, the sclerotia was big sized, globular and was myceloid. Maize isolate produced somewhat spherical to small oval shaped sclerotia. Soybean and moongbean isolate produced irregular shaped sclerotia with pitted surface. While the groundnut isolate generally produced irregular shaped sclerotia with smooth surface. In vivo virulence potential of five different field isolates of Rhizoctonia solani isolated from different hosts were studied against different varieties (Swarna, Maheshwari, TN-1, and HMT) of rice crop and it was found that the isolate of groundnut had maximum development of lesion followed by moongbean in Swarna variety. In Maheshwari and HMT variety, moongbean isolate showed maximum development of lesion and least was shown by maize isolate and maize isolate does not had any effect on HMT variety of rice crop. In TN-1 variety, groundnut isolate had maximum development of lesion followed by the isolates of rice and maize while the isolate of moongbean showed least reduction in lesion length.
Pages: 1798-1803 | 480 Views 30 Downloads
How to cite this article:
Rajeshwari Divya, RK Dantre, AS Kotasthane. Studies on variability of Rhizoctonia solani isolated from different hosts and its virulence on rice crop. Int J Chem Stud 2018;6(2):1798-1803.