铝胁迫对柑橘实生幼苗生长的影响

每天用含0、0.2、0.6、1.0和1.6 mmol/L AlCl3•6H2O的1/4 Hoagland营养液浇沙培茶枝柑(Citrus reticulata)、芦柑(C. reticulata)、福橘(C. reticulata)、四川红橘(C. reticulata)、文旦柚(C. grandis)、尤力克柠檬(C. limon)、雪柑(C. sinensis)、酸橙(C. aurantium) (来自湖北)、枸头橙(C. aurantium) (来自浙江)、红木黎檬(C. limonia)、枳壳(Poncirus trifoliata)和枳柚（P. trifoliata × C. grandis）等12个柑橘种类品种实生幼苗3个月。结果表明：雪柑、茶枝柑、芦柑、福橘、四川红橘、尤力克柠檬和枳的耐铝性较强，即使在最高铝（1.6 mmol/L）处理下，其根系、地上部和单株干重均与对照无显著差异；枸头橙、酸橙、红木黎檬和枳柚的耐铝性较差，在最高铝（1.6 mmol/L）处理时，其根系和/或地上部的生长均会受到不同程度的抑制；文旦柚耐铝性最差，最低铝浓度（0.2 mmol/L）处理时，其根系和单株生长量就显著下降。铝胁迫引起茶枝柑、福橘、四川红橘、酸橙和枳实生苗根冠比增加，但对芦柑、枸头橙、尤力克柠檬、红木黎檬、文旦柚和枳柚实生苗根冠比无显著影响；除最低铝处理时雪柑根冠比降低外，其它处理之间无显著差异。

Effects of Aluminum on the Growth of Young Citrus Seedlings

Seedlings of Citrus reticulata cv. Chachiensis, C. reticulata cv. Ponkan, C. reticulata cv. Fuju, C. reticulata cv. Sichuanhongju, C. grandis cv. Wendanyou, C. limon cv. Eureka, C. sinensis cv. Xuegan, C. aurantium (from Hubei)、C. aurantium cv. Goutoucheng (from Zhejiang), C. limonia (red)、Poncirus trifoliata, and citramelo (P. trifoliata × C. grandis) cultivated in pots containing sand were fertilized daily for 3 months with quarter-strength Hoagland’s solution at an Al concentration of 0, 0.2, 0.6, 1.0 or 1.6 mmol/L from AlCl3&;#8226;6H2O. The results showed that ‘Xuegan’, ‘Chachiensis’, ‘Ponkan’, ‘Fuju’, ‘Sichunongju’, ‘Eureka’ and P. trifoliata were relative aluminum (Al) tolerant, whose dry weight of roots, shoots and whole plants was not affected at the 1.6 mmol/L Al level; ‘Goutoucheng’, C. aurantium, C. limonia and citramelo were relative Al sensitive, whose growth of roots and/or shoots was inhibited at the 1.6 mmol/L Al level. ‘Wendanyou’ was the most Al sensitve of all these citrus species and cultivars and 0.2 mmol/L Al decreased significantly its dry weight of roots and whole plants. Al stress resulted in an increase in the ratio of root dry weight to shoot dry weight of ‘Chachiensis’, ‘Fuju’, ‘Sichunongju’, C. aurantium, and P. trifoliata seedlings, but did not affect sgnificantly the ratio of ‘Ponkan’, ‘Guotoucheng’, ‘Eureka’, C. limonia, ‘Wendanyou’ and citramelo seedlings. No significant difference was found in the ratio of root dry weight to shoot dry weight of ‘Xuegan’ seedlings among different treatments except for a significant dcrease in the lowest Al treatment.