Ms. 2106 SHORT COMMUNICATION Changes in rhizosphere populations of selected physiological groups of bacteria related to substitution of specific pairs of c h r o m o s o m e s in spring wheat Summary Rhizosphere population characteristics of two cultivars of spring wheat (Tritieum aestivum L. emend Thell.), Rescue (R) and Cadet (C), and the related chromosome substitution lines, C-R5B and C-R5D, were investigated. R e p l a c e m e n t of the chromosome pair, 5 B, in Cadet with 5 B from Rescue made m a n y of the rhizosphere microbial characteristics of C-R5 B similar to or the same as those in the rhizosphere of the donor parent, Rescue. In contrast, substitution of the functionally related chromosome pair, 5D, did not cause marked changes in the rhizosphere microbial population, demonstrating the specificity of the plant's control over factors governing the rhizosphere microbial environment.
A derivative of Triticum aestivum L. emend Thell. cultivar Rescue3 (2n = 42) × Agropyron elongatum (Host.) Beauv. (2n = 70) is immune to wheat streak mosaic virus Marmor virgatum McK., has 21 pairs of chromosomes, and hybridizes readily with wheat. By crossing with lines ditelosomic for known chromosomes it was determined that Agropyron chromosomes have replaced wheat chromosomes 4D, 5D, and 6D. In growth habit the immune line is like Rescue, but its long slender spikes, absence of awns, and small, slender, blue seeds resemble Agropyron.
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