TAILIEUCHUNG - Báo cáo khoa học: "Physiological and pathological aspects of long-term storage of acorns"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Physiological and pathological aspects of long-term storage of acorns. | 384s Ann Sci For 1993 50 Suppl 1 384S-387S Elsevier INRA Original article Physiological and pathological aspects of long-term storage of acorns J Guthke w Spethmann Universităt Hannover Institut fijr Obstau und Baumschule Am Steinberg 3 3203 Sarstedt Germany Summary The development of a seedlot of oak has been followed over a period of 32 months. During the observation period the absolute starch content of acorns and the exploitation of starch reserves at germination decreased with increasing duration of storage. Ageing processes are probably impairing the availability of food reserves. After 12 months a marked decrease in germination capacity appeared caused by a fungal disease. However the low storage temperature and high co2 content seem to have stressed the acorns which has probably predisposed them to infection with the weak pathogen Cylindrocarpon didymum. Under natural conditions the acorns developed typical frost hardiness. acorn storage germination I food reserves I frost hardiness Resume Aspects physiologiques et pathologiques de la conservation des glands à long terme. Le développement d un lot de glands a été observe pendant une période de 32 mois. Pendant la période observốe la teneur absolue en amidon et I utilisation des reserves d amidon des glands ont diminué avec augmentation de la durée de conservation. II est possible que le processus de vieillissement réduise la disponibilité des reserves nutritives. Après 12 mois une diminution nette de la faculte germinative s est manifestee causée par une infection fongique. II semble que la temperature basse et les teneurs en co2 élevées constituent des facteurs de stress sur les glands qui pourraient favoriser I infection par le champignon Cylindrocarpon didymum. Dans les conditions naturelies les glands manifestent une resistance au gel. conservation des glands germination reserves nutritives resistance au gel Long-term storage of acorns 385s INTRODUCTION Knowledge of physiological processes in seeds is a

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