The circadian clock gene regulatory module enantioselectively mediates imazethapyr-induced early flowering in Arabidopsis thaliana.
Plant growth and development are strongly affected by environmental pollutants, such as herbicides. Widely used herbicides can remain in soil or aquatic systems for long periods of time. Herbicide pollutants have been reported to heavily affect global plant growth and pose a significant challenge to agriculture. However, it is unclear whether herbicides affect plant flowering. Here, we demonstrated that imazethapyr (IM), a chiral herbicide, can enantioselectively promote flowering in Arabidopsis thaliana. We clarified the possible mechanism by which IM promotes flowering and found that the photoperiod pathway may play an important role in propagating the IM stress signal. IM enantiomers decreased the amplitude of core oscillators (CIRCADIAN CLOCK ASSOCIATED 1 and LATE ELONGATED HYPOCOTYL) and utilized the up-regulation of the GIGANTEA-(CONSTANS)-FLOWERING LOCUS T pathway to induce floral gene, APETALA1 over-expression enantioselectively; this treatment ultimately caused early flowering. Our findings provide new insight into the method by which plants control reproductive timing in response to herbicide stress. Flowering time is an important trait in crops and affects the life cycles of pollinator species. The persistence of herbicides in the biosphere will alter plant life cycles and diversity.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China. Electronic address: hfqian@zjut.edu.cn.
Haifeng
H
Qian
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
Xiao
X
Han
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
Xiaofeng
X
Peng
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
Tao
T
Lu
College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, People's Republic of China.
Weiping
W
Liu
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China. Electronic address: azwfu@zjut.edu.cn.
Zhengwei
Z
Fu
D017360:Arabidopsis / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D057906:Circadian Clocks / Q000187:drug effects; D035264:Flowers / Q000187:drug effects / Q000254:growth & development; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D053263:Gene Regulatory Networks / Q000187:drug effects*; D006540:Herbicides / Q000494:pharmacology*; D009539:Nicotinic Acids / Q000494:pharmacology*; D060888:Real-Time Polymerase Chain Reaction; D012098:Reproduction / Q000187:drug effects; D013237:Stereoisomerism
D029681:Arabidopsis Proteins; D006540:Herbicides; D009539:Nicotinic Acids; C093630:imazethapyr
Arabidopsis thaliana; Clock genes; Flowering; Imazethapyr; Photoperiod pathway