Track 2-3-1: Integrated Nutrient Management for Soil Health and Effects on Quality of Production
Description
On a global scale, acidic soils cover an estimated 37.8 million km2 of the earth's surface, and up to 50% of the world’s potentially arable soils are acidic. Aluminum (Al) is highly abundant in acid soil conditions. At low (< 5.5) pH, a toxic form of aluminum, Al3+, is solubilized from aluminosilicate clay minerals into soil solutions. High concentrations of Al3+ in soil solutions caused seriously damage to plants by inhibiting cell elongation and division in roots, leading to swollen root apices with poor or no root-hair development, and decreasing plant growth (Kochian et al., 2005). Al toxicity represents one of the most important constraints for agricultural production in areas with acidic soils. Plant hormones are involved in plant adaptation to environmental stresses (Zhu et al., 2013). However, limited information is available for hormones effects on plant tolerance to Al3+ toxicity. Alfalfa (Medicago sativa L.) is an important legume used as a forage crop worldwide. Al toxicity is a major factor limiting alfalfa production in soils with low pH. The purpose of this study was to investigate Al3+ -induced abscisic acid (IAA) transport, distribution and their relation to Al3+ -inhibition of root growth in alfalfa by exogenous foliar application of IAA on plants with or without apical buds.
Included in
Effects of Abscisic Acid on Alleviation of Aluminum Toxicity in Alfalfa
On a global scale, acidic soils cover an estimated 37.8 million km2 of the earth's surface, and up to 50% of the world’s potentially arable soils are acidic. Aluminum (Al) is highly abundant in acid soil conditions. At low (< 5.5) pH, a toxic form of aluminum, Al3+, is solubilized from aluminosilicate clay minerals into soil solutions. High concentrations of Al3+ in soil solutions caused seriously damage to plants by inhibiting cell elongation and division in roots, leading to swollen root apices with poor or no root-hair development, and decreasing plant growth (Kochian et al., 2005). Al toxicity represents one of the most important constraints for agricultural production in areas with acidic soils. Plant hormones are involved in plant adaptation to environmental stresses (Zhu et al., 2013). However, limited information is available for hormones effects on plant tolerance to Al3+ toxicity. Alfalfa (Medicago sativa L.) is an important legume used as a forage crop worldwide. Al toxicity is a major factor limiting alfalfa production in soils with low pH. The purpose of this study was to investigate Al3+ -induced abscisic acid (IAA) transport, distribution and their relation to Al3+ -inhibition of root growth in alfalfa by exogenous foliar application of IAA on plants with or without apical buds.
