tailieunhanh - Báo cáo khoa học: "Compared sensitivity of seedlings from 3 woody species (Quercus robur L, Quercus rubra L and Fagus silvatica L) to water-logging and associated root hypoxia: effects on water relations and photosynthesis"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Compared sensitivity of seedlings from 3 woody species (Quercus robur L, Quercus rubra L and Fagus silvatica L) to water-logging and associated root hypoxia: effects on water relations and photosynthesis. | 417 Ann Sci For 1994 51 417-429 Elsevier INRA Original article Compared sensitivity of seedlings from 3 woody species Quercus robur L Quercus rubra L and Fagus silvatica L to water-logging and associated root hypoxia effects on water relations and photosynthesis E Dreyer INFM-Nancy Bioclimatologie et Écophysiologie Unite d Ecophysiologie Forestiere F 54280 Champenoux France Received 7 June 1993 accepted 25 October 1993 Summary - Seedlings of Quercus robur Q rubra and Fagus silvatica were submitted to a period of partial water table at 6 cm below ground or total water-logging for 4 weeks. Important disorders were induced by the latter treatment in growth root decay partial leaf wilting water relations decreased predawn water potential and photosynthesis stomatai closure reduced net assimilation rates lowered o2 evolution under saturating co2 and irradiance and limited photochemical efficiency of PS II . It has been concluded that the observed stomatai closure was accompanied by strong disorders at chloroplast level which happened without visible waterlogging-induced deficiencies in mineral nutrient supply. Reactions to partial water-logging were much more limited. F silvatica displayed the strongest disorders in response to both treatments Q robur showed only slight stress effects in response to partial water-logging and Q rubra had intermediate behaviour. These observations are in agreement with the reported differences in sensitivity to water-logging of adult trees in the stand. The precise chain of events leading to these disorders in the shoots of water-logged seedlings remains to be elucidated. stomatai conductance hydraulic conductance mineral nutrition photochemistry photosystem II Abbreviations. Vwm and midday and predawn leaf water potential MPa PFD photon flux density pmol rrr2 S 1 A. net co2 assimilation rate pmol m-2 s-1 gw leaf conductance to water vapour mmol nr2 s Cj intercellular concentration of co2 pmol mob1 Awe leaf to air difference in vapour .

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