Response of Disomic Chromosome Substitution lines of wheat to Azotobacter chroococcum grown under different soil types

摘要

A pothouse experiment was conducted to evaluate response of 20 disomic chromosome substitution lines of cv. C591 in the background of Chinese spring to inoculation of two strains of Azotobacter, M37 and Mac27, grown under two different soil types i.e. sand and clay-loam. Experiment was laid out in a completely randomized block design (CRD) with three replications. Observations were recorded on important seedling, root and plant traits contributing to grain and biological yield. On overall basis, most lines responded better to M37 as compared to Mac27. Between soil types clay loam supported higher number of Azotobacter colonies in wheat rhizosphere. This may be the major reason for the better performance of various disomic substitution lines for yield and yield attributing traits and high nitrogen content, particularly in 1D, 2B and 1A. Among disomic substitution lines 3A, 5A, 2B, 7B and 1D responded better for several seedling, root and plant traits and hence the grain and biological yield. As several lines responded to inoculation by M37 in particular, it is expected that the response be due to growth promoting phytohormones produced by bio-inoculants and the responsive genes (QTLs) localized on different chromosomes Chromosome specific selective breeding is recommended to concentrate gene constellations on one or two chromosomes to facilitate wheat breeding for organic regimes.