tailieunhanh - Báo cáo lâm nghiệp: "Contribution of different solutes to the cell osmotic pressure in tap and lateral roots of maritime pine seedlings: effects of a potassium deficiency and of an all-macronutrient deficienc"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Contribution of different solutes to the cell osmotic pressure in tap and lateral roots of maritime pine seedlings: effects of a potassium deficiency and of an all-macronutrient deficiency. | Ann. Sci. For. 55 1998 315-327 Inra Elsevier Paris 315 Original article Contribution of different solutes to the cell osmotic pressure in tap and lateral roots of maritime pine seedlings effects of a potassium deficiency and of an all-macronutrient deficiency Marie-Béatrice Bogeat-Triboulot Gerard Levy Equipe sol et nutrition unite d ecophysiologie forestiere Institut national de la recherche agronomique Inra 54280 Champenoux France received 7 April 1997 accepted 4 September 1997 Abstract - Seedlings of maritime pine Pinus pinaster Ait. were grown in hydroponics and submitted either to a potassium deficiency or to an all-macronutrient deficiency. In response to both nutrient stresses tap root elongation was maintained while lateral root elongation was severely reduced. In both treatments K content was decreased to of dry weight in roots and in shoots. Other minerals were little affected by the single deficiency except nitrogen whose content increased significantly in roots. Measurements of the concentrations of inorganic ions soluble sugars and amino acids on a tissue water basis revealed that in unstressed plants potassium phosphate choride glucose fructose and glutamine accounted for about two thirds of cell osmotic pressure with relative contributions depending on location in the root system. In seedlings subjected to deficiency K was more or less efficiently replaced by soluble sugars glutamine and or sodium according to location in the root system. Osmotic pressure was better maintained in younger tissues but also in tap root tip as compared to lateral root tip. potassium deficiency osmotic pressure inorganic ion glutamine soluble sugar root growth Resume - Contribution de differents solutes à la pression osmotique cellulaire dans le pivot et les racines latérales de semis de pin maritime. Effets d une carence en potassium et d une carence en tous macroelements. Des plantules de pin maritime Pinus pinaster Ait. cultivées en hydroponie ont été soumises à .

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