Phenylalanine ammonia-lyase 2 regulates secondary metabolism and confers manganese tolerance in Stylosanthes guianensis
文献类型： 外文期刊
作者： Wang, Linjie 1 ; Li, Jifu 1 ; Liu, Liting 1 ; Dong, Rongshu 1 ; Liu, Guodao 1 ; Rao, Idupulapati M. 3 ; Chen, Zhijian 1 ;
作者机构： 1.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Key Lab Crop Gene Resources & Germplasm Enhancemen, Minist Agr & Rual Affairs, Haikou 571101, Peoples R China
2.Chinese Acad Trop Agr Sci, Natl Key Lab Trop Crop Breeding, Sanya 572024, Peoples R China
3.Int Ctr Trop Agr, Cali 763537, Colombia
期刊名称：PLANT PHYSIOLOGY （ 影响因子：6.9； 五年影响因子：7.7 ）
ISSN： 0032-0889
年卷期： 2025 年 197 卷 1 期
页码：
收录情况： SCI
摘要： Stylo (Stylosanthes guianensis) is a tropical legume that exhibits considerable tolerance to manganese (Mn) toxicity, which severely constrains plant growth in acidic soils. To elucidate the Mn detoxification mechanisms in stylo, this study investigated the excess Mn-regulated metabolic profile of stylo roots and examined the role of metabolic enzymes in Mn tolerance. Excess Mn triggered oxidative stress in the 2 stylo genotypes tested. However, Mn-stimulated activation of antioxidant defense systems was observed in the Mn-tolerant genotype RY5 but not in the Mn-sensitive genotype TF0317. Metabolomic analysis of the Mn-tolerant RY5 roots revealed numerous excess Mn-responsive metabolites, mainly related to flavonoids and phenolic acids. Furthermore, a set of genes involved in the phenylpropanoid/flavonoid pathway were upregulated by excess Mn in stylo roots, especially in RY5. We characterized the excess Mn-inducible gene SgPAL2, encoding phenylalanine ammonia-lyase. SgPAL2 localized to the endoplasmic reticulum. Compared with control plants, SgPAL2 overexpression led to increases in shoot and root dry weights under Mn-excess conditions, whereas SgPAL2 suppression had the opposite effect. Moreover, SgPAL2 overexpression dramatically altered secondary metabolism, particularly flavonoid metabolism. In a bioassay, the inhibition of root elongation caused by excess Mn was alleviated by treatment with exogenous calycosin, an SgPAL2-regulated isoflavonoid, suggesting calycosin can detoxify Mn. Taken together, these findings indicate that SgPAL2 plays a critical role in enhancing Mn tolerance in stylo through metabolic regulation. The excess manganese-inducible gene SgPAL2 encodes phenylalanine ammonia-lyase, which enhances manganese tolerance in Stylosanthes guianensis by altering flavonoid metabolism.
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