8th INTERNATIONAL WHEAT CONFERENCE

The accessions Gamdow-6; Lakata-1; Fret-1; BAV 92//SAP/ MON performed better than
Inqilab 91. A Pakistani variety Uqab was the best performer in field conditions and it was
moderately tolerant in aquaculture, while a Pakistani variety AS-02 was susceptible in
field and aquaculture. A Chinese variety Ning 8319 was found good in aquaculture.
The germplasm was evaluated during the years 2004-05 and 2005-06 in field conditions
for drought tolerance. Two sets of the material were planted in a double row plot of 2.5m
length. Basal irrigation for germination was applied to both the sets. Afterwards, one
set was irrigated normally (4 irrigations) and no irrigation was applied to the other set.
Fertilizers and other practices were according to the standard recommendations. The
rainfall received in the crop season during 2004-05 and 2005-06 was 158mm and 43mm,
respectively. Hence, there were different stress levels in both the years. Yield per plant
under stress and relative yield per plant (yield under stress /yield under normal) were
used as criterion for drought tolerance. Kukuna; Weebil 1; Harrier’S’; PBW343; CROC/
AE.SQ(203)//KAUZ/3/CASIA; PVN//CAR422/ANA/5/BOW/CROW//BUC/PVN/3/
YR/4/TRAP#1 were the best drought.
Unusual frost during the 2008-09 crop season helped in screening the material for frost
tolerance. During the period 15 th Dec to 15 th Feb frost was observed in 48 nights. This
damaged the early sown wheat crop of farmers particularly early heading varieties like
Shafaq and Bhakhar. In a set of 450 germplasm entries, most of accession were severely affected
but varieties/lines Uqab; HD2009; Kanchan; Shalimar88; MAYA/PVN; Bluesilver;
HD2179; Punjab81; VEE#10/2*PVN completed heading and anthesis in the frost period
and were not affected. The lines HUW234+Lr34 and HUW234+Lr34 //2* PRL/VEE#10
have shown pollen sterility. When pollinated with viable pollen, they have shown about
40-50% seed setting. They can further be studied for low temperature induced male sterility
for use in wheat hybrid development. A Bangladeshi variety ‘Kanchan’ have shown
moderate to high level of tolerance for all these stresses.
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