Root excretions in relation to the rhizosphere effect

摘要: The exudation of amino acids by the roots tomato, subterranean clover, and phalaris growing in nutrient solution under different environmental conditions has been studied. amounts balance exuded plants differed — tomato exceeding clover. Exudation was greater from during first two weeks growth than second two-week period. Light intensity had a marked effect on serine, glutamic acid α-alanine exudate were less at lower light intensities. In root aspartic acid, phenylalanine leucine decreased with decreasing but serine asparagine increased. Higher temperatures increased clover roots, latter released large higher temperatures. both considerably temperature. Calcium level aeration little presence micro-organisms influenced concentration surrounding roots.