数字农科院2.0

β‑1,4‑D‑Glucan-Based Oligomers Modulate PTI to Fine-Tune Lettuce Immune Responses

文献类型： 外文期刊

作者： Jiuxing He; Meng Kong; Wei Han; Min Gong; Qiuyan Huo; Jiqing Song; Peiwu Li; Xurong Mei; and Guohua Lv

关键词： damage-associated molecular patterns (DAMPs); pattern-triggered immunity (PTI); cello-oligosaccharides; degree of polymerization; lettuce

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2025 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Damage to plant cell walls releases endogenous molecules that act as damage-associated molecular patterns (DAMPs) to activate immunity. The contribution of cellulose-derived β-1,4-glucan oligomers (cello-oligosaccharides) to this process remains unclear. Here, we show that cello-oligosaccharides elicit pattern-triggered immunity (PTI) in Lactuca sativa in a chain-length− dependent manner. Across DP2−DP5, cellotetraose (CEL4) elicited the strongest responses, including rapid ROS production, MPK6 phosphorylation, defense gene induction, stomatal closure, and callose/lignin deposition. Transcriptomic analyses revealed that chain length qualitatively encodes the signaling output by selectively engaging defense modules rather than simply amplifying response amplitude. CEL4 further potentiated flg22-induced immunity and reduced Botrytis cinerea infection, indicating DAMP− PAMP synergy. CEL4-induced immunity was transient and growth-compatible, with photosynthetic and metabolic recovery within 12 h. Thus, CEL4 represents a structure-specific, growth-compatible immunomodulator, and chain length emerges as a key informational cue for decoding carbohydrate DAMPs, with implications for sustainable, immune-centered crop protection.

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