Background and aims

The domestication of modern crop cultivars involved significant changes in key agronomic traits relative to their wild relatives. This study aimed to investigate the effects of crop domestication on leaf phosphorus (P)-use strategies, particularly photosynthetic P-use efficiency (PPUE), under low plant-available soil P conditions.

Methods

Ten crop species and their wild relatives were grown in pots under low plant-available soil P conditions to compare leaf PPUE, the concentration and percentage of five leaf P fractions, and investigate the correlation of these P fractions with PPUE.

Results

Domesticated crops exhibited significantly higher area-based (A_area) and mass-based (A_mass) photosynthesis rate, and PPUE (63%, 74% and 69%, respectively) than their wild relatives under low plant-available P condition. Domesticated crops demonstrated a 49% higher metabolite-P concentration but an 18% lower lipid-P concentration than their wild relatives. Domestication significantly reduced P allocation to lipid-P (20%) and inorganic-P (9%), coupled with increased partitioning to metabolite-P (67%) and residual-P (43%). PPUE was positively correlated with A_area, A_mass, metabolite-P concentration, and the percentage of leaf P allocated to the metabolite-P fraction, while being negatively correlated with leaf P concentration, nucleic acid-P, inorganic-P concentration, and the percentage of leaf P allocated to inorganic-P fraction.

Conclusion

Crop domestication enhanced PPUE by increased photosynthesis rates and a shift in leaf P allocation to different P fractions. Greater allocation to P-containing metabolites but reduced investment in inorganic P provide crucial mechanistic insights for enhanced PPUE under P-limited condition, unravelling strategies aimed at improving crop P-use efficiency under low-limited environment.

中文翻译：

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作物驯化提高了光合磷利用效率，这与低土壤磷条件下叶片磷组分的变化有关

 背景和目标

现代作物品种的驯化涉及与其野生近缘种相关的关键农艺性状的显着变化。本研究旨在研究在植物有效土壤磷含量较低的条件下，作物驯化对叶片磷（P）利用策略的影响，特别是光合磷利用效率（ PPUE）。

 方法

在低植物有效土壤磷条件下在盆中种植十种作物及其野生近缘种，比较叶片 PPUE、五种叶片 P 组分的浓度和百分比，并研究这些 P 组分与 PPUE 的相关性。

 结果

在低植物有效磷条件下，驯化作物表现出比野生近缘种显着更高的面积（A_面积）和质量（A_质量）光合作用速率和 PPUE（分别为 63%、74% 和 69%）。与野生近缘种相比，驯化作物的代谢物磷浓度高出 49%，但脂质磷浓度低 18%。驯化显着减少了磷对脂质磷（20%）和无机磷（9%）的分配，同时增加了对代谢物磷（67%）和残留磷（43%）的分配。 PPUE 与 A_面积、A_质量、代谢物 P 浓度以及叶 P 分配到代谢物 P 部分的百分比呈正相关，而与叶 P 浓度、核酸 P、无机 P 浓度和叶 P 浓度呈负相关。分配给无机磷部分的叶磷百分比。

 结论

作物驯化通过增加光合作用速率和将叶片磷分配到不同的磷组分来增强 PPUE。增加对含磷代谢物的分配，但减少对无机磷的投资，为有限磷条件下增强PPUE提供了重要的机制见解，揭示了旨在提高低有限环境下作物磷利用效率的策略。