Indian Society of Genetics & Plant Breeding

Important

INHERITANCE OF ADDITIONAL RESISTANCE FROM NEAR-ISOGENIC LINES FOR THE GENE LR3 AGAINST INDIAN LEAF RUST RACES

Published on

Near-isogenic leaf rust resistant lines Thatcher + Lr3Ka, Prelude+Lr3Ka and Prelude+Lr3s
in were found to carry a yet undescribed field resistance effective against a mixture of
highly virulent variants 77-1 and 77-2 of the Indian leaf rust race 77. Against another highly
virulent culture from race 108 showing avirulence on Lr3, these three lines as well as the
near-isogenic lines Thatcher+Lr3do and Thatcher+Lr3bg were resistant both at seedling
and adult plant stages. The seedling resistance of each of these five near-isogenic lines to
race 108 was caused by a recessive gene. The seedling resistance of Thatcher+Lr3do and
Thatcher+Lr3bg to race 108 was due to the 'lame gene or a gene tightly linked to Lr3. This
resistance segregated independently of the recessive seedling resistance gene identified
from the near-isogenic lines Thatcher+Lr3ka, Prelude+Lr3ka and Prelude+Lr3sin. The field
resistance of isogenic lines Thatcher+Lr3ka, Prelude+Lr3ka and Prelude+Lr3sin was due
to a dominant and a recessive gene in each. The factors causing field resistance in each of
these three near-isogenic lines were different.
 

Keywords: Puccinia recondita, Triticum aestivum, allelic tests, adult plant resistance.

Info

Year: 1995
Volume: 55
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

Authors

info_circle

Download PDF