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Journal of Applied Genetics 47(1), 2006, pp. 29-38

Genetic parameters and correlations of collar rot resistance with important biochemical and yield traits in opium poppy (Papaver somniferum L.)

Mala Trivedi, Rajesh K. Tiwari, Om P. Dhawan


Abstract: Collar rot, caused by Rhizoctonia solani Kühn, is one of the most severe fungal diseases of opium poppy. In this study, heritability, genetic advance and correlation for 10 agronomic, 1 physiological, 3 biochemical and 1 chemical traits with disease severity index (DSI) for collar rot were assessed in 35 accessions of opium poppy. Most of the economically important characters, like seed and capsule straw yield per plant, oil and protein content of seeds, peroxidase activity in leaves, morphine content of capsule straw and DSI for collar rot showed high heritability as well as genetic advance. Highly significant negative correlation between DSI and seed yield clearly shows that as the disease progresses in plants, seed yield declines, chiefly due to premature death of infected plants aswell as low seed and capsule setting in the survived population of susceptible plants. Similarly, a highly significant negative correlation between peroxidase activity and DSI indicated that marker-assisted selection of disease-resistant plants based on high peroxidase activity would be effective and survived susceptible plants could be removed from the population to stop further spread.

Key words: collar rot, correlation, genetic advance, heritability, Papaver somniferum, Rhizoctonia solani.

Correspondence: M. Trivedi, Institute of Cell Biology, School of Life Sciences, Lanzhou University, Lanzhou 730000, Gansu, P.R. China; e-mail: malatiwaricimap@rediffmail.com

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