article · Plants
Infection by Cucumber mosaic virus alters the defence mechanisms and biochemical makeup of squash plants over a twelve-day period. Following confirmed viral inoculation, researchers tracked changes in gene activity and plant metabolism. The virus causes an initial increase followed by an overall suppression of key defence-related genes, including those responsible for pathogenesis-related proteins and enzymes within the phenylpropanoid pathway. While some genes like PR-2 remain induced in systemically infected tissues, others, such as PAL and HQT, face significant suppression in later stages. Chemical profiling showed that viral infection alters levels of flavonoids, fatty acids, and phenolics. In particular, the virus suppresses most phenolic compounds, notably chlorogenic acid. This biochemical suppression may weaken the plant's immune defences, potentially facilitating the rapid spread of the pathogen throughout the squash tissues.
Cucumber mosaic virus is a damaging plant pathogen that affects important agricultural crops like squash. Understanding the specific genes and defensive chemicals suppressed by the virus illuminates how it overcomes plant immunity. Pinpointing these molecular vulnerabilities helps agricultural researchers understand plant disease progression and could inform future breeding efforts aimed at reinforcing natural resistance against viral infections.
This study represents early-stage basic research into plant-virus interactions. The findings identify specific biochemical pathways and genes, such as those governing chlorogenic acid production, that could serve as targets for crop breeders and agricultural biotechnologists seeking to develop virus-resistant squash varieties. However, the abstract does not report any applied product development, agronomic field trials, or direct commercial tools, indicating that practical applications remain distant from real-world agricultural use.
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The current study focuses on the effects of <i>Cucumber mosaic virus</i> (CMV) infection on phytochemical changes and pathogenesis- and phenylpropanoid pathway-associated gene activities in squash (<i>Cucurbita pepo</i> L.) plants during a time course of 2 to 12 days post inoculation (dpi). The identity of the CMV isolate was confirmed by DAS-ELISA, TEM, and coat protein gene sequence. The CMV infection initially boosts and then suppresses transcript levels of the defense-related genes <i>PR-1, PR-2, PAL, HQT</i>, and <i>CHS</i> during the investigated time course compared to controls. The expression profile during the time-course study indicated that early, transient induction of <i>PR-1</i> occurs during CMV infection, while CMV induced the expression of <i>PR-2</i> in systemically infected squash tissues at all time points and suppressed the expression of <i>PAL</i> and <i>HQT</i> at 8-12 dpi. <i>CHS</i> transcript levels fluctuated between up- and down-regulation, but by 12 dpi, <i>CHS</i> expression reached its peak. The HPLC and GC-MS analyses of CMV-infected squash extracts revealed that different phenolic, flavonoid, and fatty acid compounds could be induced or suppressed upon CMV infection. In particular, CMV could suppress the synthesis of most phenolic compounds, specifically chlorogenic acid, possibly leading to the virus's rapid spread.
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DOI: 10.3390/plants11151908
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