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Spikeless tillers of wheat (Triticum aestivum L.) affect grain yield because of less than optimum effective plant
population. This study was conducted to examine the genetic variability for tiller mortality, and its relationship to grain
yield in diverse wheat lines. Twenty lines were evaluated in replicated field tests in 4 years at Rampur, Nepal. The
characters investigated were maximum number of tiller produced, the number of reproductive tillers, tiller mortality, and
grain yield. The lines differed significantly for all characters. The tiller mortality ranged from 7 to 30%. There were
substantial effects of environment on all four characters. The entry-by-year interactions were significant for all traits,
primarily because of changes in the relative genotypic differences for these traits in the four years. However, certain lines
consistently ranked low or high for tiller mortality. There was a significant negative correlation between front tine tiller and grain yield in 3 out of
4 years. There was a positive correlation of highest tiller number with reproductive tiller number and with tiller mortality.
Grain yield showed a nonsignificant positive correlation with maximum tiller number. The reproductive tiller number was
positively correlated with grain yield. Results of this study indicate that spikeless tillers contribute negatively to grain
yield and that genetic variation exists for tiller mortality in spring wheat.