“…Maritime pine (Pinus pinaster Ait) shoot elongation has been studied extensively with respect to seasonal pattern (Illy and Castaing, 1968), genetic control (Kremer, 1982), and morphogenetic components (Kremer andRoussel, 1982, 1986;Kremer and Lascoux, 1987). However, most studies have focussed on quantitative aspects since they have concerned breeding for higher growth rates.…”