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到2030年，我国将基本建成现代农产品产地市场体系_我的网站

A |     Mosquitoes use the body odor, heat, and carbon dioxide that humans emit, varying from person to person, to find their next meal. The study, which was published in the scientific journal Cell, reveals that mosquitoes may perceive odors via a variety of distinct pathways, in contrast to animals, which have a single set of neurons that detect each sort of odor.,Female mosquitoes use the variety of odors that people and other animals produce to find the blood that will feed their eggs. The olfactory neurons in the insects' antennae, which are where they take up scents, detect and send scent information to the brain.,Groups of human-odor receptors on the olfactory neurons in the antennae of female mosquitoes (Aedes aegypti) were rendered inactive by the study's lead author Meg Younger and her colleagues at Boston University in Massachusetts using the gene editing tool CRISPR.,"We found that there’s a real difference in the way mosquitoes encode the odors that they encounter compared to what we’ve learned from other animals,” Younger is quoted as saying in the Guardian report on the findings.,According to Younger, the scientists believed that mosquitoes would adhere to the core tenet of olfaction, which states that each neuron expresses only one type of receptor.,“Instead, what we’ve seen is that different receptors can respond to different odors in the same neuron," she added.,This reportedly suggests that mosquitoes can still detect human odors after losing one or more receptors. The researchers asserted that this backup system may have developed as a survival mechanism.,"The mosquito Aedes aegypti is specialized to bite humans, and it is believed that they evolved to do that because humans are always close to fresh water and mosquitoes lay their eggs in fresh water. We are basically the perfect meal, so the drive to find humans is extremely strong," Younger explained,In the end, the researchers argued, knowing how the mosquito brain perceives human odor could be used to influence biting behavior and stop the spread of diseases like malaria, dengue fever, and yellow fever that are transmitted by those insects.,"One major strategy for controlling mosquitoes is to attract them to traps to remove them from the biting population. If we could use this knowledge to understand how human odor is represented in the mosquito antennae and brain, we could develop blends that are more attractive to mosquitoes than we are. We could also develop repellants that target those receptors and neurons that detect human odor," Younger concluded.,Notably, Christopher Potter at Johns Hopkins School of Medicine in Maryland recently found a similar phenomenon in fruit flies, or Drosophila melanogaster.,“If one of these types of olfactory receptors is mutated or no longer functioning, there’s this backup system," Potter is quoted as saying in the New Scientist report. “It’s changing the dogma of what we thought we knew about the olfactory system.”,Science & TechSmell of Blood: Mosquitoes' Scent-Based Host-Seeking Mechanism Revealed16 May, 05:54 GMT。    近日，农业农村部印发《全国农产品产地市场体系发展“十五五”规划》，以推进农产品产需衔接、完善农产品现代流通体系为重点任务，推动线上线下融合、产地销地匹配、农业商业互联，完善产地市场设施建设，优化市场营销服务，增强监测预警能力，发展壮大流通主体，高质量推进农产品产地市场体系建设。规划指出，到2030年，我国将建成50个能够辐射带动区域乃至全国优势产业发展的农产品产地市场集群，培育壮大1500个具有仓储保鲜、初加工、冷链配送能力的产地冷链集配中心，壮大500个高标准引领、高水平认证支撑的农业精品品牌，推动现代农产品产地市场体系基本建成。到2035年，现代农产品产地市场体系建设取得显著成效，实现农产品产需高效衔接，在保障农产品稳定安全供给、提升农业质量效益和促进农民增收等方面作用更加突出，有力支撑农业农村现代化建设。

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