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Inheritance of host plant resistance to the sorghum shootfly

Published online by Cambridge University Press:  19 September 2011

B. S. Rana ,
M. G. Jotwani  and
N. G. P. Rao
B. S. Rana
Affiliation:
AICSIP, IARI Regional Station, Hyderabad, India
M. G. Jotwani
Affiliation:
AICSIP, IARI Regional Station, Hyderabad, India
N. G. P. Rao
Affiliation:
AICSIP, IARI Regional Station, Hyderabad, India
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Abstract

The behaviour of shootfly resistance is examined over the Fl, F2, F3 and advanced generations. The Fl is almost intermediate between two parents with an added heterotic advantage of a lower ‘dead-heart’ percentage. Resistance shows partial dominance under low to moderate shootfly infestation but this relationship may shift under heavy infestation conditions.

The resistance is polygenic in nature and governed by additive genes. In the absence of host immunity, gradual accumulation of favourable genes is possible by line breeding from R × I and I × I crosses by selecting 1 SD below the population mean. Selection for multiple characters limits the genetic advance for shootfly resistance—resulting in 0- 5% selection intensity and relatively less resistant but high yielding desirable progenies. Multilocation tests enable the selection of varieties stable for shootfly resistance.

Keywords

Shootflyresistanceinheritancevarietiesprogeniesselectioncrossesgenerationssusceptible
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 2 , Special Issue 1-2: The Biology, Ecology and Control of the Sorghum Shootfly, Atherigona soccata Rondani , June 1981 , pp. 105 - 109
Copyright
Copyright © ICIPE 1981

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References

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