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Maize (Zea mays) is an important food, feed and bioenergy crop, which plays a pivotal strategic role in China's food security, and pests seriously affect the yield and quality
of maize.
Benzoxazinoids (BXDs) and Volatile terpenes are synthetic insect-resistant defense compounds, BXDs, in maize Directly inhibit insect feeding, terpene compounds attract natural enemies of pests to parasitize and prey
on pests.
Previous studies have shown that jasmonic acid (JA) treatment can promote the accumulation of BXDs and volatile terpene compounds, but the internal molecular mechanism is unknown
.
JA is an important plant hormone that plays an important role
in plants responding to insect feeding.
MYC2 is a key transcription factor in the JA signaling pathway, regulating the transcriptional expression
of JA-mediated defense response genes.
In Arabidopsis, tomato, and rice, MYC2 regulates JA-mediated insect resistance defense mechanisms that have been extensively studied, but how MYC2 regulates JA in maize The molecular mechanisms underlying mediated anti-insect defense responses remain unclear
.
Recently, Wu Jianqiang's team from the Kunming Institute of Botany, Chinese Academy of Sciences identified the function
of maize MYC2 in JA-mediated insect-resistant defense response through genetics, biochemistry, molecular biology and bioinformatics.
The results showed that the resistance of ZmMYC2s mutants to Mythimna separata and Spodoptera frugiperda was significantly weakened compared with wild-type maize.
ZmMYC2s biprostic plants have a femaleized male spike phenotype, indicating that ZmMYC2s regulates the insect resistance defense of maize and the sex-determination process
of maize male panicles.
Analysis of BXDs and volatile terpene content in ZmMYC2s mutants and transcriptional levels of synthetic genes showed that ZmMYC2s were performed during maize response mimicking insect feeding and MeJA treatment Positively regulates the biosynthesis
of BXDs and volatile terpene compounds.
ZmMYC2s activate the BXDs synthesis genes IGPS1/3 and BX10/11/12/14 and terpene synthesis genes Transcriptional activity of promoters of TPS10/2/3/4/5/8.
Combined RNA-Seq and CUT&Tag-Seq analysis identified 22 ZmMYC2s that were directly regulated and responded to simulated insect feeding MeJA-treated transcription factors, 7 transcription factors involved in regulating the biosynthesis of Dingbu, ZmMYC2s may form a transcriptional regulatory network with these transcription factors, enhancing the insect-resistant defense response
of maize.
This study provides an important basis for understanding the molecular mechanism of maize insect resistance and JA signaling pathway.
The study, titled ZmMYC2s play important roles in maize responses to simulated herbivory and jasmonate, was published online in the Journal of Integrative Plant Biology Ma Canrong, a doctoral student at the Kunming Institute of Botany, Chinese Academy of Sciences, is the first author of the paper, and researcher Wu Jianqiang and associate researcher Wang Lei are co-corresponding authors
.
The research was supported
by the Pilot Cultivation Program of the Chinese Academy of Sciences, the Center for Excellence in Biological Interactions, the National Natural Science Foundation of China, and the Yunnan Innovation Team Project.
Article link
ZmMYC2s regulates the insect-resistant response of maize to insect feeding and the sex-determination process of maize male ears
W+OS: simulated insect feeding, ns: no significant difference, nd: not detected, myc2ab: ZmMYC2s double mutant, myc2a: ZmMYC2a mutant, myc2b: ZmMYC2b mutant
.
