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Discussion<br />
109<br />
B.A. Malik<br />
Dr. K.B.Singh mentioned that desi crosses will he made at ICRISAT and F2<br />
generation will be supplied to ICARDA for screening against Ascochyta rabiei<br />
and developing material for inclzsion in the international nurseries. My suggestion<br />
is that F2 bulk (depending upon the availability of seed) may be<br />
supplied to the cooperating national programs for selection under their own<br />
conditions. This would accelerate the process of cultivaral evolution and would<br />
reduce the risk of disease incidence due to diversified testing.<br />
J.B. Smithson<br />
F2 populations o' crosses involving Ascochyta-resistantdesi lines will certainly<br />
be provided to Pakistan next season.<br />
H.C. Weltzien<br />
Were your mixtures or multilines exposed to natural infection or to artifical<br />
inoculation? The principle of multiline effect can only work when a natural<br />
epiphytotic is observed and the slower disease progress is measured.<br />
K.B. Singh.<br />
The trial was grown at Tel Hadya and Lattakia Under Tel Hadya conditions<br />
the disease pressure was high as the experimental plot was entirely surrounded<br />
by susceptible genotypes, whereas at Lattakia, the experiment has been grown<br />
away from disease nursery. But the disease development and spread was high<br />
at both the locations.<br />
T.S. Sandhu<br />
For launching a breeding program for pyramiding genes in a simple cultivar or<br />
development of multilines we need information that genes in the resistant<br />
sources are located at different loci and are not multiple alleles of the same<br />
gene. I am afraid this information is lacking in chickpea in respect of resistance<br />
to ascochyta blight.<br />
K.B. Singh<br />
Our knowledge about the genetics of resistance to blight is limited. This is<br />
precisely the reason that we propose to identify the genes first and then to<br />
incorporate them in a single genotype. The information about the races of the<br />
pathogen and sources of resistance for each race is essential before initiating<br />
any program for the development of multilines in chickpeas.<br />
F.A. Elsayed<br />
The esistance of mixtures, which you have discussed in your presentation, are<br />
not even close to the definition of multilines?<br />
K.B. Singh<br />
We have not initiated any program for the development of mulitlines because<br />
we do not have information on races of blight pathogen. Only after establishing<br />
races and identifying sources of resistance to different races, one could initiate
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