sensitive species 4-7: tolerant plants 15-50 mg/g/dw
||Vatansever R, Ozyigit II, Filiz E. Essential and Beneficial Trace Elements in Plants, and Their Transport in Roots: a Review. Appl Biochem Biotechnol. 2017 Jan181(1):464-482. doi: 10.1007/s12010-016-2224-3. p.471 top paragraphPubMed ID27687587
|| Xu, G., Magen, H., Tarchitzky, J., & Kafkafi, U. (2000). Advances in chloride nutrition. Advances in Agronomy, 68, 96–150. link
||P.470 bottom paragraph: "Cl, as being an essential micronutrient, involves in regulation of the pH and turgor pressure, and cytoplasmic enzyme activities, helps to stabilize the membrane potential, and plays a cofactor role in photosynthesis [refs 5, 157, 158, 160, primary source]. Its deficiency causes the reduced leaf growth and wilting resulted with chlorosis and necrosis, and causes the stunted roots and reduced fruit size. However, its deficiency rarely occurs in normal conditions because the chlorine concentrations in soil are usually high and plants only require the trace amounts [ref 160]. Besides, higher concentrations are reported to be toxic to plants, particularly many economically valuable cereals, vegetables, and fruit crops are susceptible to chlorine toxicity (4–7 mg/g/dw for sensitive species and 15–50 mg/g/dw for tolerant plants) [primary source]."