圖1. 最近一項針對豆科植物的研究已經揭露，在根瘤菌共生期間，IRON MAN (IMA)胜肽(縮胺酸)促進了，將鐵收集到根瘤中的角色。就植物生長及氮衡定性之關鍵層面的氮固定而言，此過程是至關重要的。
A recent study on leguminous plants has uncovered the role of IRON MAN (IMA) peptides in facilitating the collection of iron into root nodules during rhizobial symbiosis. This process is vital for nitrogen fixation, a key aspect of plant growth and nitrogen homeostasis.
IMA peptides in legumes enhance iron acquisition for nitrogen fixation, offering insights into sustainable agriculture practices.
於豆類中的IRON MAN (IMA)胜肽增強了，獲取供固定氮之用的鐵。這提供了，可持續之農業實務的諸多洞察力。
Leguminous plants have a mechanism (rhizobial symbiosis) to efficiently acquire nitrogen, which is an essential macronutrient for growth, through the nitrogen-fixing bacteria rhizobia. Root nodules are organs on plant roots that facilitate the symbiotic relationship.
豆科植物具有一種，藉由固定氮的細菌根瘤菌有效獲取，就生長而言，是種不可或缺之大量氮營養素的機制(根瘤菌的共生)。根瘤是於植物根上，促進共生關係的器官。
Rhizobia colonizes these nodules and fix nitrogen by converting nitrogen from air into ammonia. Iron is needed for the enzymes that catalyze nitrogen fixation; however, where and how iron is transported to the nodule and used for nitrogen fixation is largely unknown.
根瘤菌移生於此些根瘤中，並藉由將來自空氣的氮轉化成氨，來固定氮。對催化固定氮的酵素而言，鐵是必需的；然而，鐵在何處及如何被運輸到根瘤中，及被用於固定氮，絕大部分不詳。
In this study, using the legume model plant Lotus japonicus, a transcriptome analysis was performed based on the nitrogen status in the plant body during the rhizobial symbiosis process. IRON MAN (IMA) peptides consisting of approximately 50 amino acids were identified, which function systemically (shoot and root systems) to collect iron into the nodules following rhizobial infection.
在該項使用豆科模型植物百脈根(屬於豆科草本植物)的研究中，根據根瘤菌共生過程中，於植物體內的氮狀態，進行了一項轉錄體分析。鑑定了，由大約50個胺基酸組成的IMA胜肽，其在根瘤菌感染之後，系統性地(芽及根體系)起作用，將鐵收集到此些根瘤中。
Furthermore, the function of IMA peptides was analyzed in L. japonicus and Arabidopsis thaliana, a plant devoid of rhizobial symbiosis. In both plant species, the IMA peptides maintained nitrogen homeostasis by obtaining iron in response to increased nitrogen concentrations in the plant body, thereby regulating plant growth.
此外，也分析了百脈根及擬南芥(缺乏根瘤菌共生的植物)中，IMA胜肽的功能。於這兩植物物種中，IMA胜肽藉由，在對該種植物體內，增多之氮濃度作出反應中獲取鐵，維持了氮衡定性，從而調節植物的生長。
The research group previously identified a mechanism for regulating rhizobial symbiosis in response to the presence of nitrogen in the soil. This study builds on previous studies by clarifying the underlying mechanism of iron acquisition in response to nitrogen, which provides further insight into the mechanisms of plant adaptation to the environment.
先前，該研究團隊確認了一種，在對土壤中氮的存在作出反應，以調節根瘤菌共生的機制。這項研究，以先前諸多研究為基礎，藉由闡明在對氮作出反應上，獲取鐵的基本機制，提供了植物適應此環境之諸機制的進一步洞察力。
These findings are promising for the development of new technologies that contribute to a sustainable society by maximizing the capacity of plants for microbial symbiosis in terms of nutrient use.
此些研究發現可望開發，藉由根據養分使用，最大化植物供微生物共生的能力，且可持續之生物社會的新技術。
網址：https://scitechdaily.com/how-plants-obtain-nitrogen-by-supplying-iron-to-symbiotic-bacteria/
翻譯：許東榮
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