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Wheat Information Service
Number 84: 49-50 (1997)
Research information

Agronomic performance of semi-dwarf wheat (Triticum aestivum L.) genotypes1

K.A. Siddiqui, M.A. Sial and K.D. Jamali

Atomic Energy Agricultural Research Centre, Tandojam Sindh, Pakistan


During the past four decades the incorporation of semi-dwarf genes into wheat crop in the world has resulted in dramatic yield increases. The majority of semi-dwarf wheat varieties covering more than half the world's wheat acreage now carry either Rht1 or Rht2 (Gale and Youssefian 1985). Eight advanced lines and two commercial varieties Sarsabz and Soghat 90 of wheat (Triticum aestivum L.) were selected to study the agronomic characters. Presence of semi-dwarf genes were presumed by the parentage of a genotype mentioned in the list of pedigree (Singh et al. 1989).

The varietal comparison results are presented in Table 1. WRSO1 (Rht1) and SI88155 (Rht1) lines had the lowest grain yield per plant than the other genotypes. The remaining eight genotypes were not significantly different from each other for their grain yield per plant. WRS01 had the reduced number of grains and yield of main spike and also lowest number of grains per spikelet. Sarsabz (Rht1) and Soghat 90 (Rht2) had the highest grain yield of main spike. SI8878 (Rht1) had the highest number of grains per spike and spikelet. SI88171 had the lowest number of spikelets per spike. SI88123 (Rht1) had the highest grain yield per plant in the non-significant group of genotypes and also had the increased number of spikes per plant. Final yield is a complex character and depends on its various components. Each genotype has its own strategy to produce more yield.


References

Gale MD and Youssefian S (1985) Dwarfing genes in wheat. ln: Progress in Plant Breeding I: 1-35 Ed: Russell GE. Butterworths London.

Singh RP, Villareal RL, Rajaram S and Del Toro E (1989) Cataloguing dwarfing genes Rht1 and Rht2 in germplasm used by the bread wheat breeding programme at CIMMYT. Cereal Res Comm 17: 273-279.

1Contribution No.42 of AEARC Tandojam

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