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Plant viruses impose a serious threat on agriculture, which motivates extensive breeding efforts for viral resistant crops and inspires lasting interests on basic research to understand the mechanisms underlying plant immunity against viruses. Viruses are obligate intracellular parasites. Their genomes are usually small and only encode a few products that are essential to hijack host machinery for their nucleotide and protein biosynthesis, and that are necessary to suppress host immunity. Plants evolved multilayers of defense mechanisms to defeat viral infection. In this research topic, we gathered 13 papers covering recent advances in different aspects of plant immunity against viruses, including reviews on RNA silencing and R gene based immunity and their application, translational initiation factor mediated recessive resistance, genome editing based viral immunity, role of chloroplast in plant-virus interaction, and research articles providing new mechanistic insights on plant-virus interactions. We hope that this Research Topic helps readers to have a better understanding of the progresses that have been made recently in plant immunity against viruses. A deeper understanding of plant antiviral immunity will facilitate the development of innovative approaches for crop protections and improvements.

Virus --- Hormone --- Plant Immunity --- NBS-LRR --- Soybean mosaic virus --- Cucumber mosaic virus --- Genome editing --- RNA silencing --- Chloroplast --- Recessive Resistance

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Plant viruses impose a serious threat on agriculture, which motivates extensive breeding efforts for viral resistant crops and inspires lasting interests on basic research to understand the mechanisms underlying plant immunity against viruses. Viruses are obligate intracellular parasites. Their genomes are usually small and only encode a few products that are essential to hijack host machinery for their nucleotide and protein biosynthesis, and that are necessary to suppress host immunity. Plants evolved multilayers of defense mechanisms to defeat viral infection. In this research topic, we gathered 13 papers covering recent advances in different aspects of plant immunity against viruses, including reviews on RNA silencing and R gene based immunity and their application, translational initiation factor mediated recessive resistance, genome editing based viral immunity, role of chloroplast in plant-virus interaction, and research articles providing new mechanistic insights on plant-virus interactions. We hope that this Research Topic helps readers to have a better understanding of the progresses that have been made recently in plant immunity against viruses. A deeper understanding of plant antiviral immunity will facilitate the development of innovative approaches for crop protections and improvements.

Virus --- Hormone --- Plant Immunity --- NBS-LRR --- Soybean mosaic virus --- Cucumber mosaic virus --- Genome editing --- RNA silencing --- Chloroplast --- Recessive Resistance --- Virus --- Hormone --- Plant Immunity --- NBS-LRR --- Soybean mosaic virus --- Cucumber mosaic virus --- Genome editing --- RNA silencing --- Chloroplast --- Recessive Resistance

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• EndNote
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This paper presents the first causal evidence on the effects of school accountability systems on teacher labor markets. We exploit a 2002 change in Florida's school accountability system that exogenously shocked some schools to higher accountability grades and others to lower accountability grades, and measure whether teachers in shocked schools are more or less likely to move. Using microdata from the universe of Florida public school teachers, we find strong evidence that accountability shocks influence the teacher labor market; specifically, teachers are more likely to leave schools that have been downward shocked -- especially to the bottom grade -- and they are less likely to leave schools that have been upward shocked. We also find that accountability shocks influence the distribution of the measured quality of teachers (in terms of value added measures) who stay and leave their school, though the average differences are not large.