关键词: 荔枝, 花诱导, 低温, 碳水化合物

Abstract: The study aimed to investigate the carbohydrate changes during flower induction of litchi (Litchichinensis Sonn. ) trees. In‘Guiwei’litchi, 95.8% terminal shoots flowered on trees of early (Oct.5) terminal flushing whereas only 18.0 % on trees of late (Nov.15) flushing. Over 99 % of terminal shoots in ‘Nuomici’and‘Feizixiao’litchi trees , irrespective of flushing early or late (from Oct.1 to Nov.5) , formed flower panicles. The contents of soluble sugars and starch in roots (1 cm in diameter) , trunks (5-8 cm in diameter) , large branches (3-5 cm in diameter) , small branches (1 cm in diameter) , terminal autumnal shoots and leaves were investigated over the period from November to January. Results showed that the concentration of soluble sugars increased from November to December and then decreased in January, while the starch concentration increased progressively , especially in the upper parts of the canopy. Starch concentrations in the heavy flowering trees were highest in small branches and decreased acropetally and basipetally , whereas the concentrations of soluble sugars were highest in the terminal shoots. Starch concentration in the leaves was higher than that in the terminal shoots of the light flowering trees. It is suggested that carbohydrate distribution pattern may serve as an indication for the judging of the floral induction effect in litchi .

Key words: Litchi (Litchi chinensis Sonn. ), Floral induction, Low temperature Carbohydrate