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Inheritance of Subcrown Internode Length, Crown Depth, and Crown-Tissue Regrowth in a Winter Wheat Cross¹

Forty-two randomly selected wheat (Triticum aestivum L.) lines from the cross ‘Gaines’/‘Nord’ were studied for inheritance of subcrown internode length, crown depth, and crown tissue regrowth at three exposures to cold temperature [0 C for 20 hours (control), and –18 for 4 and 8 hours]. Heritability estimates calculated by the progeny-parent (F₅, F₄) regression method for subcrown internode length and crown depth were 74 and 79%, respectively, suggesting that inheritance of the two criteria is not complex and should permit adequate selection progress. Subcrown internode length and crown depth were closely genetically related with one another, whereas both of these traits were expressed independently of crown tissue regrowth at the three exposures. Use of subcrown internode length and crown depth as selection criteria would not enhance crown tissue regrowth after exposure to cold temperature. The heritability coefficients for crown tissue regrowth of the control, and the 4 and 8-hour exposures to –18 C were 31, 36, and 49%, respectively. This indicated that screening for this trait in the F4 generation is feasible but may be less successful than selection for subcrown internode length and crown depth. Except for subcrown internode length of F4 lines, all three traits were expressed independently of the short plant stature gene (Rht2) of Gaines.

Key Words: Triticum aestivum • Heritability • Cold tolerant • Winterhardiness

² Lecturer i crop science, Fac. of Agriculture, Kabul Univ., Afghanistan (formerly post-doctoral fellow, Washington State Univ.); and geneticist, SEA, USDA, Pullman, WA 99164, respectively.

Received for publication March 21, 1977.