Data Views Total Plants: 182 CSV Excel PDF Total Activities: 20 Show All Paginate , Previous12345678910 Click on column headings to sort the list on the column Plant Part All parts ... Bark Bulb Flower Fruit Inflorescence Leaf Pericarp Plant Rhizome Root Seed Shoot Stem Tissue Culture Tuber Low PPM High PPM StdDev *Reference Zea mays Root -- 36.0 -0.4 * Zea mays Shoot -- 85.0 -0.7 * *Unless otherwise noted all references are to Duke, James A. 1992. Handbook of phytochemical constituents of GRAS herbs and other economic plants. Boca Raton, FL. CRC Press.