Can seed quality of hairy fleabane be reduced due to glyphosate resistance?

• Main Author: Costa, Flávia Regina da
• Publication Date: 2018
• Other Authors: Stinghen, Jussara Cristina, Bortoli, Janice Regina Gmach, Coelho, Cileide Maria Medeiros, Carvalho, Leonardo Bianco de
• Format: Article
• Language: eng
• Source: Revista de Ciências Agroveterinárias (Online)
• Download full: https://periodicos.udesc.br/index.php/agroveterinaria/article/view/11126
• topic: Conyza bonariensis; herbicide resistance; seed vigor; conyza; germination; herbicide; Conyza bonariensis; resistência a herbicida; vigor de semente; conyza; germinação; herbicida

The resistance to glyphosate may provide a penalty on plant growth and physiology. We investigate if the resistance to glyphosate reduces the seed quality of Conyza bonariensis by performing seed viability and vigor tests under a completely randomized design with four replicates of 50 seeds for both glyphosate-susceptible (S) and -resistant (R) biotypes. Low seed viability (<50%) was found in both S and R biotypes. No difference occurred between either S and R biotypes on seed germination and embryo viability. The percentage of seed germination of the S biotype was higher than the R biotype in the cold test (~58%), accelerated aging test (~84%), and high-temperature stress test (~45%). This is the first time one found evidences that resistance to glyphosate may be responsible for a penalty on seed quality of C. bonariensis.