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The resistance offered by
different genes is also highly influenced by factors viz.,
environment under which plant is grown, age of the plant and genetic
background of the host plants (McGregor and Manners 1985).
It is known that adult
plant resistance offered by the specific genes is not consistent
under given environment. Gupta (1985) indicated that the
adult plant resistance shown by Lr13, Lr26 and Lr14a
is not consistent against different cultures of the race 77A and
hence classification of genes for a seedling resistance or adult
plant resistance cannot be considered as absolute. Hence, the
interactive effect of Lr13 with various genes invites
detailed study. The wider occurrence of Lr13 in Indian wheats
and its contribution of durable additional adult plant resistance are
yet to be exploited. However, the extensive testing of the
constituted lines and consistent result for rust resistance in the
present study indicated that these lines may offer durable resistance
against the prevailing rust races at Wellington. Sawhney
(1994)
opined that judicious combination of moderate adult plant resistance
genes known for durability and other specific but short lived highly
resistance genes provide the most practical and effective strategy
for prolonged and complete resistance. Against this background the
transfer of specific genes (Sr31 and Yr9) and adult
plant resistance genes may offer effective and durable resistance in
the newly constituted lines.
References
Browder LE (1981) A compendium of information and named genes for
low reaction to Puccinia recondita f. sp. tritici.
Crop. Sci. 13: 203-206
Gupta AK (1985) Effectiveness and nature of leaf rust resistance
genes in hexaploid and tetraploid wheats.
In: Proc 3rd Natl Seminar on Genet and Wheat Improv, Shimla (Eds
Akshey K. Gupta, S. Nagarajan and R. S. Rana) pp: 33-56.
McGregor AJ and Manners JG (1985) The effect of temperature and light
intensity and growth and sporulation of Puccinia striiformis
on wheat. Plant. Pathol. 34: 263-271.
Sambroski DJ and Dyck LP (1982) Enhancement of resistance to
Puccinia recondita by interactions of resistance genes in wheat.
Can J.PI.Patho. 4: 152-156
Sawhney RN (1985) Genetics study of Triticum-Puccinia
interactions and its value in breeding strategies. In: Proc 3rd Natl
Seminar Genet and Wheat Improv, Shimla (Eds Akshey K.Gupta, S.
Nagarajan and R. S. Rana) pp: 6-32.
Sawhney RN (1994) In: Monograph on "Breeding for durable resistance
to wheat rusts", IARI, Pusa, New Delhi 110-012
Tomar SMS, Kochumadhavan M, Nambisan PNN and Rao MV (1985) Stripe
rust resistance in diverse stocks carrying specific genes in
hexaploid wheat. In: Proc 3rd Natl Seminar on Genet and Wheat Improv,
Shimla (Eds Akshey K. Gupta, S. Nagarajan and R. S. Rana). pp:
224-231.
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