tailieunhanh - Báo cáo lâm nghiệp: "Effect of water stress on potassium distribution in young seedlings of maritime pine (Pinus pinaster"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effect of water stress on potassium distribution in young seedlings of maritime pine (Pinus pinaster. | 379s Ann. Sci. For. 1989 46 suppl. 379s-383s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Effect of water stress on potassium distribution in young seedlings of maritime pine Pinus pinaster Ait. A. Nguyen1 and A. Lamant2 1 INRA Laboratoire d Amélịorạtion des Arbres Forestiers Pierroton 33610 Cestas and 2 Laboratoire de Biologic et Physiologie Végétales CNRS UA56Õ Université de Bordeaux I av. des Facultes 33405 Talence France Introduction One possible adaptational response of plants with respect to drought is osmotic adjustment Kramer 1980 . At low water potential the maintenance of turgor is needed to sustain cell enlargement. Two cellular processes may be involved in turgor maintenance variation in cell wall elasticity and or accumulation of intracellular solutes. Actually without any information on the volumetric modules of elasticity most authors ascribe the maintenance of turgor to an increase of intracellular solutes. The cation potassium which is the major osmotic component in plant cells is often thought to be a possible osmoregulator Wyn Jones and Gorham 1983 . In this paper two populations of maritime pine Pinus pinaster Ait a droughtsensitive one Landes from France and a better adapted one Tamjoute from Morocco were compared for potassium content and migration to the aerial parts. In a previous study Nguyen and Lamant 1989 a more intense osmoregulation was found in root apices of young seed lings of the Tamjoute population compared to seedlings of the Landes population. Materials and Methods Seedlings were grown on an aerated nutrient solution Seillac 1960 The intensity of light was 30 W-m-2 with a 14 h photoperiod a relative humidity of 45 70 day night and a temperature of 24 22 C. Water deficit was applied only to roots by a step-wise addition of PEG polyethylene glycol to the solution MPa 12 h or 24 h . The different final degrees of water stress were nutrient solution without PEG and MPa. K contents were .

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