Đang chuẩn bị liên kết để tải về tài liệu:
Handbook of Plant Nutrition - chapter 12
Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
12 Manganese The determination of manganese (Mn) essentiality in plant growth by McHargue (1914–1922) focused the attention of plant nutritionists on this nutrient, and led the way for further groundbreaking studies. | CRC_DK2972_Ch012.qxd 7 14 2006 11 19 AM Page 35 12 Manganese Julia M. Humphries James C.R. Stangoulis and Robin D. Graham University of Adelaide Adelaide Australia CONTENTS 12.1 Introduction .351 12.2 Forms of Manganese and Abundance in Soils.352 12.3 Importance to Plants and Animals .352 12.3.1 Essentiality of Manganese to Higher Plants .352 12.3.2 Function in Plants .352 12.3.3 Importance to Animals .353 12.4 Absorption and Mobility .353 12.4.1 Absorption Mechanisms .353 12.4.2 Distribution and Mobility of Manganese in Plants .353 12.5 Manganese Deficiency .354 12.5.1 Prevalence .354 12.5.2 Indicator Plants .354 12.5.3 Symptoms .354 12.5.4 Tolerance .355 12.6 Toxicity.356 12.6.1 Prevalence .356 12.6.2 Indicator Plants .356 12.6.3 Symptoms .356 12.6.4 Tolerance .357 12.7 Manganese and Diseases .357 12.8 Conclusion .365 Acknowledgments .365 References .366 12.1 INTRODUCTION The determination of manganese Mn essentiality in plant growth by McHargue 1914-1922 focused the attention of plant nutritionists on this nutrient and led the way for further groundbreaking studies. Since then research into the concentrations of manganese that confer deficiency or toxicity and the variation between- and within-plant species in their tolerance or susceptibility to these afflictions has proliferated. The symptoms of toxicity and deficiency have also received much attention owing to their variation among species and their similarity to other nutrient anomalies. The diversity of visual symptoms within a species that often confounds diagnosis has been 351 CRC_DK2972_Ch012.qxd 7 14 2006 11 19 AM Page 35 352 Handbook of Plant Nutrition attributed to soil conditions. Soil pH is one of the most influential factors affecting the absorption of manganese by changing mobility from bulk soil to root surface. In addition to research on manganese diagnostics workers have also focused on the role of manganese in resistance to pests and disease revealing economically important interactions that .