Off-campus UNL users: To download campus access dissertations, please use the following link to log into our proxy server with your NU ID and password. When you are done browsing please remember to return to this page and log out.
Non-UNL users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
Effect of the 1BL/1RS translocation on yield components and grain yield in hard red winter wheat in Nebraska
Abstract
The objective of this study was to assess the effect of the 1BL/1RS wheat-rye translocation on yield components and grain yield of hard red winter wheat in diverse Nebraska environments. Two different genetic backgrounds were used: (1) a set of randomly $\rm F\sb3$-derived genotypes from the cross 'Siouxland'/'Ram' (Siouxland is a 1BL/1RS source whereas Ram is a non-1RS cultivar), and (2) a random set of $\rm F\sb{12}$-derived genotypes from the wheat cultivar 'Rawhide' (Rawhide is heterogenous for the 1BL/1RS translocation). Genotypes were screened by electrophoresis for the presence or absence of the translocated segment. Field trials with the identified genotypes were conducted in seven (Siouxland/Ram background) and four (Rawhide background) environments. A 9% yield increase on 1BL/1RS over 1B and heterogeneous genotypes was found in the Siouxland/Ram background. Higher grain yield of the 1BL/1RS genotypes was explained mainly by increased kernel weight. Better agronomic performance of the 1BL/1RS genotypes in the Siouxland/Ram background could be associated with stress tolerance during grain filling in lower yielding environments. No significant differences for grain yield were found among genotypes in the Rawhide background. 1BL/1RS genotypes had heavier kernels but fewer spikes $\rm m\sp{-2}$ than 1B genotypes. Average yields for all genotypes were significantly higher than normal in three of four environments. Hence, lack of differences among chromosome classes could be attributed to (1) absence of stressful conditions in three of four environments tested, or (2) there is no difference between 1BL/1RS and 1B genotypes in this genetic background. Lack of effect on agronomic performance of the 1BL/1RS translocation in Rawhide background is important. The 1BL/1RS translocation confers a detrimental effect on wheat end-use quality; consequently a "reconstructed" Rawhide without the translocation should have better quality and similar agronomic performance to Rawhide.
Subject Area
Agronomy|Genetics
Recommended Citation
Moreno-Sevilla, Benjamin, "Effect of the 1BL/1RS translocation on yield components and grain yield in hard red winter wheat in Nebraska" (1994). ETD collection for University of Nebraska-Lincoln. AAI9425299.
https://digitalcommons.unl.edu/dissertations/AAI9425299