How do peptides transmit plant defense signals? Experiments provide the answer

Plants can also transmit messages! Taichung No. 1 Senior High School student Chen Yong-an used "salt stress" to investigate how the model organism "Arabidopsis" transmits defense messages, proving that "peptides," which fall between amino acids and proteins, can be used by plants to transmit messages; the finding aids the development of agricultural techniques, and "A Study on the Root Transmission of Defense Messages Between Individual Arabidopsis Plants" won a silver medal at the 10th "Tunisia International Festival of Engineering and Technology."

Chen Yong-an said that biological defense mechanisms are very important to whether a population can survive, and compared with animals, plant defense mechanisms are less often studied. Because plants cannot move freely to escape environmental pressures such as pests, diseases, and salt, they have developed defense mechanisms more complex than those of animals; at his advisor's suggestion, he chose Arabidopsis as the subject of his research.

Chen Yong-an said that during the experiment he used a high-salinity solution to create "salt stress" so that a small number of Arabidopsis plants secreted peptides, which were then received by other plants not subjected to salt stress; the other plants showed signs as if they had experienced salt stress, confirming that when a small number of plants suffer stress, they can use peptides to warn surrounding unaffected plants to defend themselves in advance.

Chen Yong-an said that although his research used salt stress to confirm the role of peptides, pests and diseases are also a direction for future research. He pointed out that environmental stress is a major factor affecting crop yields, and that if the mode of action of peptides becomes clearer in the future, it will help develop emerging pest and disease control techniques.