Indian Society of Genetics & Plant Breeding

NATURE AND INHERITANCE OF LEAF RUST RESISTANCE OF WHEAT CULTIVAR HD2009

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The leaf rust resistant cultivar HD2009 and the reference line for the gene Lr34 (RL6058),
show high infection types against race 77-5 both on see'dlings and adult plants
suggesting absence of hypersensitive resistance in these two wheats. The field resistance
of HD2009 to this race is due to small uredia as compared to those seen on Agra
Local, a susceptible cultivar. The latency period on Agra Local was longer than that
of HD2009. The reference line RL6058 developed smaller uredia and showed longer
latency period as compared to HD2009 and Agra Local. The F2 generation from the
cross HD2009/RL6058 transgressed for field resistance as well as susceptibility to leaf
rust indicating that resistance of HD2009 is not due to Lr34. The F2 and F3 plants
from the cross HD2009 / Agra Local also showed similar transgression, which is attributed
to recombination of factors contributing towards resistance, both from resistant and
susceptible parents
 

Keywords: Wheat (Triticum aestivum), Lr34, race 77, durable resistance.

Info

Year: 2000
Volume: 60
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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