Variability of spike spikelets number in bread wheat

The number of spikelets per spike is related to the seed yield per spike and total seed yield of wheat plants. The aim of this work is to investigate of spike spikelets number variation in primary spike of wheat grown under different environmental conditions. The 10 wheat genotypes were used for the study. The genotypes were grown in the experiment on a plot size of 1 m2 in three replications in two vegetation seasons (2015-2017). The seeds of at a distance of 0.10 m in rows of 1.0 m length among which was a distance of 0.2 m. At the full maturity stage, the 20 plants replication-1 were used for the analysis of the number of spikelets per primary spike. The analysis of variance was performed by MSTAT C (5.0 version). The results showed significant differences among wheat genotypes in both years, according to number of spikelets per primary spike. On average in the first vegetation season the least number of spikelets per primary spike 19.30 had G-3502-2, while the highest number of spikelets 23.51 had G-3502-1 genotype. In the second vegetation season the number of spikelets primary spike-1 varied from the lowest 19.25 in the G-3502-2 genotype to the highest 25.46 in G-3502-1 genotype. The differences in the average of spikelets spike-1 were determined by genetic, environmental factors, and interaction genotype/environment.