文章出处题 Overthe years , scientists havereported that different types of plants , from trees totomatoes , release compounds( 化合物 )into the air to help neighboring plants.These chemical warningsall have thesame purpose — to spread information aboutone plant’s disease or infestation so other plants candefend themselves.Butexactly how plants receive and act on many of thesesignals is still mysterious. Inthis week ’s Proceedings of the National Academy ofSciences , researchers in Japan offered someexplanations.They had identifiedone chemical message and traced it all the wayfrom release to action. 3.Thepassage is likely to appear in ________