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Relationships between Morphological Characters above the Flag Leaf Node and Grain Yield in Spring Wheats¹

A study of the effects of seeding rates and dates on four morphological characters above the flag leaf node and on the yield components of seven spring wheat (Triticum aestivum L. aestivum group) genotypes indicated that interaction effects among genotypes, dates, and rates were as common for the morphological characters as for the yield components. In addition, the relationship between yield per unit area and each of the morphological characters was affected greatly by date and rate of seeding and by genotype. The most consistent general relationship across the range of genotypes was obtained between yield and extrusion length and was negative. It is suggested that, in breeding for higher yield, the use of early seeding dates and intermediate seeding rates (60 to 120 kg/ha), combined with selection for short extrusion length, long heads and large flag-leaf lamina area and flag-leaf sheath area, would be useful.

Key Words: Extrusion length • Seeding dates • Seeding rates • Genotypes • Interaction • Triticum aestivum L.

² Associate professor and former M.Sc. graduate student, respectively.

Received for publication July 18, 1978.