Australian Herbicide Resistance Initiative (AHRI)

Quinclorac Resistance in Echinochloa crus-galli from China

This AHRI research paper by Q. Peng et al, entitled “Quinclorac resistance in Echinochloa crus-galli from China” was published in Rice Science in 2019.

Over the past decade, there has been a productive collaboration between AHRI and Chinese researchers.  Scholarships from the China Scholarship Council have enabled young Chinese university assistant Professors (Lecturers) to come to AHRI each for one year to work principally with AHRI researchers Drs Yu Qin and Heping Han. Dr Qiong Peng came to AHRI for one year to study Chinese Echinochloa populations resistant to the rice-selective auxinic herbicide quinclorac.  This paper documents two Echinochloa populations as being very highly resistant to quinclorac. She found that quinclorac resistance in these Echinochloa populations is not due to differential quinclorac uptake, translocation or metabolism.  Anyone who works on the mechanistic basis of auxinic herbicide resistance knows that this is a very difficult research area, given the cascade of changes that auxinic herbicides cause in plants. Further molecular work is required to identify the mechanistic basis of quinclorac resistance.

Authors: Peng Qiong, Han Heping, Yang Xia, Bai Lianyang, Yu Qin, Stephen B. Powles

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