Campus Units
Agronomy
Document Type
Article
Publication Date
2017
Journal or Book Title
Frontiers in Plant Science
Volume
8
DOI
10.3389/fpls.2017.01039
Abstract
Brassinosteroids (BRs) and Gibberellins (GAs) are two classes of plant hormones affecting plant height (PHT). Thus, manipulation of BR and GA levels or signaling enables optimization of crop grain and biomass yields. We established backcross (BC) families, selected for increased PHT, in two elite maize inbred backgrounds. Various exotic accessions used in the germplasm enhancement in maize project served as donors. BC1-derived doubled haploid lines in the same two elite maize inbred backgrounds established without selection for plant height were included for comparison. We conducted genome-wide association studies to explore the genetic control of PHT by BR and GA. In addition, we used BR and GA inhibitors to compare the relationship between PHT, BR, and GA in inbred lines and heterozygotes from a physiological and biological perspective. A total of 73 genomic loci were discovered to be associated with PHT, with seven co-localized with GA, and two co-localized with BR candidate genes. PHT determined in field trials was significantly correlated with seedling stage BR and GA inhibitor responses. However, this observation was only true for maize heterozygotes, not for inbred lines. Path analysis results suggest that heterozygosity increases GA levels, which in turn promote BR levels. Thus, at least part of heterosis for PHT in maize can be explained by increased GA and BR levels, and seedling stage hormone inhibitor response is promising to predict heterosis for PHT.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Language
en
File Format
application/pdf
Recommended Citation
Hu, Songlin; Wang, Cuiling; Sanchez, Darlene L.; Lipka, Alexander E.; Liu, Peng; Yin, Yanhai; Blanco, Michael; and Lubberstedt, Thomas, "Gibberellins Promote Brassinosteroids Action and Both Increase Heterosis for Plant Height in Maize (Zea mays L.)" (2017). Agronomy Publications. 297.
https://lib.dr.iastate.edu/agron_pubs/297
Comments
This article is published as Hu, Songlin, Cuiling Wang, Darlene L. Sanchez, Alexander E. Lipka, Peng Liu, Yanhai Yin, Michael Blanco, and Thomas Lübberstedt. "Gibberellins promote brassinosteroids action and both increase heterosis for plant height in maize (Zea mays L.)." Frontiers in plant science 8 (2017). 10.3389/fpls.2017.01039. Posted with permission.