Allantoin, a purine metabolite, confers saline–alkaline tolerance to sugar beet by triggering a self-amplifying feedback loop comprising jasmonic acid and nitric oxide

尿囊素 代谢组 茉莉酸 生物化学 一氧化氮 代谢物 化学 生物合成 生物 水杨酸 内分泌学
作者
Pengfei Zhang,Xuerui Wang,Qiang Lu,Hanwen Zhang,Jingting Chen,He Zhang,Li Wang,Caifeng Li
出处
期刊:Environmental and Experimental Botany [Elsevier]
卷期号:206: 105172-105172 被引量:10
标识
DOI:10.1016/j.envexpbot.2022.105172
摘要

Saline–alkaline (SA) soil inhibits plant growth and development. A few plants have evolved strategies to combat SA stress, but the underlying mechanisms remain elusive. In the current study, we performed a combined proteome and metabolome profiling to capture the major pathways and specified metabolites involved in the sugar beet tolerance to SA stress. Protein abundance and metabolite accumulation in purine metabolism were altered to favour allantoin accumulation under SA stress. Exogenous allantoin alleviated the oxidative damage caused by SA stress, whereas inhibition of allantoin biosynthesis weakened SA tolerance. Transcriptome analysis revealed that allantoin altered the expression patterns of genes involved in jasmonic acid (JA) and nitric oxide (NO) biosynthesis to elevate their levels under SA stress. Inhibition of allantoin biosynthesis completely abolished the JA and NO accumulation. The application of JA and NO promoted the accumulation of each other, and both enhanced SA tolerance. Inhibition of JA biosynthesis completely abolished allantoin-induced SA tolerance and NO accumulation and weakened sodium nitroprusside (SNP, a donor of NO) -induced SA tolerance, whereas inhibition of NO biosynthesis only attenuated allantoin-induced SA tolerance and JA accumulation and JA-induced SA tolerance. Our results suggest that allantoin accumulation is assisted under SA stress, promoting JA accumulation and consequently NO biosynthesis. Subsequently, NO in turn assists JA biosynthesis, forming a self-amplifying feedback loop, in which JA and NO synergistically improve SA tolerance. The current study provides a novel insight into SA tolerance in sugar beet and preliminary reveals the regulatory role of allantoin in SA tolerance.
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