Advances in Life Sciences
Year : 2016, Volume : 5, Issue : 10
First page : ( 4064) Last page : ( 6068)
Print ISSN : 2278-3849. Online ISSN : 2278-4705.

Relationship Between Inoculum Density of Rhizoctonia solani on Growth and Physiological Parameters of Pseuderanthemum atropurpureum

Ganaie Mucksood Ahmad*, Khan Tabreiz Ahmad

Section of plant pathology and Nematology, Department of Botany, Aligarh Muslim University, Aligarh, India

*Email: amu.mucksood@gmail.com

Online published on 23 December, 2016.

Abstract

Experiments were conducted to investigate the effect of Rhizoctonia solani on plant growth and physiological parameters of Pseuderanthemum atropurpureum. The gradual decrease in plant growth and physiological parameters of P. atropurpureum was observed with increasing inoculum levels of R. solani. The damaging threshold level of R. solani on P. atropurpureum was recorded as 3.0 g fungus per kg soil, as this inoculum level caused the significant reduction in plant growth and physiological parameters. Further, it was observed that R. solani caused the root-rot in the plants inoculated with different inoculum levels of R. solani. However, the intensity of rotting was not uniform and it increased with the increase in inoculum level of the R. solani. At lower inoculum levels of R. solani no aerial symptoms were observed. The infected plants at higher inoculum levels showed stunted growth and premature yellowing of leaves. The yellowing started from the lower leaves and proceeded to upwards, followed by drying and falling of leaves. The present study concludes that P. atropurpureum is a new host for R. solani.

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Keywords

P. atropurpureum, R. solani, Damaging threshold level, Root-rot, Chlorophyll content.

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