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Surface Area of Chlorophyll-containing Tissue on the Inflorescence of Triticum aestivum L.¹

To determine reasons for variability in yield of wheat (Triticum aestivum L.), we measured the chlorophyllcontaining surface area of various components of the wheat inflorenscence and estimated the proportion that contained chlorophyll.

The cultivars were classified according to awn length (long-awned, medium-awned, or short-awned). Makeup of the inflorescence-area index for the long-awned cultivars was 46% awn, 30% lemma, 20% glume, and 4% palea; of medium-awned cultivars, 37% awn, 35% lemma, 24% glume, and 4% palea; and of short-awned cultivars, 5% awn, 53% lemma, 35% glume, and 7% palea. The inflorescence area was 86%, 80%, and 38% as great as the flag-leaf area (adaxial + abaxial surface) of the long-, medium-, and short-awned cultivars, respectively.

Correlations of flag-leaf and awn area with grain yield were 0.488 and 0.719 for flag-leaf and awn areas, respectively, which supports previous reports of the importance of the awn in filling the ear.

Key Words: Awn • Leaf area • Lemma • Palea • Glume

² Associate Professor of Agronmny, Kansas State University, Manhattan, Kans. 66502; and Agronomist, Plant Science Research Division, ARS, USDA, Pullman, Wash. 99163, respectively.

Received for publication January 29, 1971.