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Wheat Information Service
Number 85: 14-20 (1997)
Research article
Removal of green photosynthetic structures and
their effect on some yield parameters in bread wheat
Naeem Mahmood and Muhammad Aslam Chowdhry
Department of Plant Breeding & Genetics, University of
Agriculture, Faisalabad, Pakistan
Summary
The studies were carried out to investigate the impact of the
removal of green photosynthetic structures including flag leaf, 3rd
nodal leaf and awns, on some yield related parameters in two local
wheat cultivars (Pasban 90 and Inqalab 91). The experiment was laid
out in a triplicated randomized complete block design in split-plot
fashion. The two varieties differed significantly for flag leaf area,
3rd nodal leaf area, seed set percentage, grains per spike and grain
weight per spike. Effect of the removal of flag leaf (T2),
3rd nodal leaf (T3) and awns (T4) was displayed
as reduction in yield components. Removal of flag leaf resulted 16.4,
14.8, 34.5 and 20.0% reduction in seed set percentage, grains/spike,
grain weight/spike and 100-grain weight, respectively. Reduction in
these traits as a consequence of the removal of 3rd nodal leaf and
awns was also significant. However the extent of this reduction was
less than that of flag leaf removal. Interaction of varieties and
treatment was significant for seed set, grains/spike and 100-grain
weight. Both of the varieties presented a marked reduction in the
four traits studied when the flag leaf was removed. However, Inqalab
91 proved superior to Pasban 90. The results signified the major
contribution of flag leaf towards yield related traits studied. In
ranked order maximum contribution occurred from flag leaf followed by
3rd nodal leaf and awns at the last.
Key words: wheat, flag leaf, nodal leaf, awns,
photosynthates
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