Higher Aluminum Tolerance of Lespedeza bicolor Relative to Lespedeza cuneata Is Associated with Saccharide Components of Root Tips

Aluminum (Al) toxicity is the primary factor limiting agricultural productivity in acid soils. The cell wall mainly composed of saccharides and first barrier for aluminum to enter plant root cells, but it unknown whether how saccharide components are involved regulating Al tolerance Lespedeza that well adapted Here, we used Al-tolerant bicolor Al-sensitive cuneata examine association with through analyzing changes roots exposed toxicity. accumulated more pectin less hemicellulose walls than Lespedeza. treatment decreased amounts total sugar secreted from within only content monosaccharides including glucose mannose both species, increased xylose contents Taken together, rather responsible accumulation, Al-decreased may enhance organic-acid secretion chelate toxic Al, which contribute tolerance.