TAILIEUCHUNG - Báo cáo lâm nghiệp: "Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Water relations of cork oak (Quercus suber L.) seedlings in response to shading and moderate drought" | Ann. For. Sci. 62 2005 377-384 INRA EDP Sciences 2005 DOI forest 2005033 377 Original article Water relations of cork oak Quercus suber L. seedlings in response to shading and moderate drought Marta PARDOSa M. Dolores JIMÉNEZa Ismael ARANDAa Jaime PUÉRTOLASb José A. PARDOSb a CITOR-INIA Ap. Correos8111 28080 Madrid Spain b . Anatomía Fisiología y Genética ETSI Montes UPM 28040 Madrid Spain Received 10 June 2004 accepted 29 September 2004 Abstract - The interactive effects of light and drought on water relations and soluble sugars were addressed on Quercus suber L. seedlings grown under the combination of four irradiances and two soil water contents. Leaf water potentials at predawn and midday were lower for water stressed seedlings independently of light environment. Osmotic potentials at full W100 and zero turgor Two decreased with drought under the four light treatments. However the decline was greater with the development of water stress under the two treatments of higher light availability. The higher soluble sugar concentrations in seedlings grown under higher irradiances provoked a decrease of Tno The decrease in W100 and Tn in moderate stressed seedlings was accompanied by an increase in max. The lower ability for osmotic adjustment in seedlings grown under moderate water stress and low light environment suggested a lower efficiency in developing physiological mechanisms for drought tolerance in shade-grown seedlings. cork oak drought light osmotic adjustment soluble sugars Résumé - Relations hydriques des semis de chêne-liège Quercus suber L. en réponse à l ombre et à une sécheresse modérée. Les effets interactifs de la lumière et de la sécheresse sur les relations hydriques et les sucres solubles ont été étudiés sur des plantules de Quercus suber L. qui ont poussé sous la combinaison de quatre éclairements différents et de deux contenus en eau du sol. Les potentiels hydriques foliaires mesurés l un avant l aube et l autre à midi étaient plus bas

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