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Genetic studies on collar rot resistance in opium poppy (Papaver somniferum L.)

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Trivedi M., Dhawan O. P., Tiwari R. K., Sattar A.
Journal of Applied Genetics
|
2005
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vol. 46
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issue 3
279-284
EN
The collar rot disease has been reported recently and occurs at the 10-12-leaf stage of plants of opium poppy. Infected plants topple down and dry prematurely due to fast rotting at the collar region. The inoculum for this study was multiplied on the cornmeal-sand cuture. Genetic ratios were calculated by the ?2 test. Inheritance studies on this disease show a monogenic pattern of segregation with the ratio of 3 : 1 at F2, 1 : 2 : 1 at F3 and 1 : 1 at the backcross. Such genetic ratios clearly indicate that a single ressisive gene (rs-1) is responsible for disease resistance in opium poppy. The infrenece drawn on the basis of the present study will be a great help in the future breeding programme of opium poppy for collar rot resistance.
2

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

100%
TrivediT., Tiwari R. K., Dhawan O. P.
Journal of Applied Genetics
|
2006
|
vol. 47
|
issue 1
29?38
EN
Collar rot, caused by Rhizoctonia solani Kuhn, 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.
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