Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 16:611-615 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Stand Establishment of Wheat Lines under Different Levels of Water Potential1

Azam Gul and R. E. Allan2

Seedling emergence and the growth of seedlings of 93 wheat (Triticum aestivum L. em Thell.) lines, developed by recurrent selection for improved seedling vigor, and tour check cultivars were studied at four soilwater levels in laboratory tests and at different planting depths and locations in three field tests. Both studies revealed that the lines differed markedly in their emergence characteristics. Emergence rate index (ERI) was high for number of lines in all four soil water potentials (—2.2, —6.0, —10.2, —14.4 bars) and in field tests.

The time required for emergence nearly doubled for each decrease of water potential of —4 bars within the range studied. Total stand, coleoptile length, seedling height, and root weight were similarly progressively reduced as water potential decreased.

Total stand, coleoptile length, and seedling height were inconsistently related to ERI in laboratory tests, but were generally related in the field tests. Likewise, root weights of the nine promising lines were inconsistent with ERI at the three higher water potentials but were correlated (r = 0.93) at the lowest water potential the laboratory tests.

Key Words: Seedling vigor • Triticum aestivum L. em Thell. • Genotype-environment interaction • Emergence

1 Cooperative investigations of the ARS, USDA and College of Agricultural Research Center, Washington State Univ., Pullman, WA 99163. Scientific Paper No. 4401, project 1467.

2 Lecturer in crop science, Faculty of Agric., Kabul Univ., Afghanistan (formerly postdoctoral fellow, Washington State Univ.); and geneticist, ARS, USDA, Pullman, WA 99163, respectively.

Received for publication May 15, 1975.




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