SYNTHESIS ON THE DATA DEALING WITH GROWTH AND DEVELOPMENT OF COMMON ASH (FRAXINUS-EXCEISIOR L)

This paper gathers the data dealing with the biology and the physiolog y of the common ash (Fraxinus excelsior L.). First, the general featur es of ash autecology are described. Then, physiology of the terminal b ud and growth and development under controlled conditions are especial ly studied. Short correlations were evidenced between apical buds and their underlying tissues, stem precedes apical bud in the chronology o f the dormancy. Long distance correlations involving carbohydrate pool changes were demons:rated between the terminal bud, taproot and stem during the growth renewal in ash tree. Root system is an key element i n the control of rhythmic growth. Results reviewed here show that deve lopment depend on the relations between the different parts of the pla nt. The work relative to renewal oi the shoot elongation after defolia tion make ash a good experimental material for studying the control of rhythmic growth.