铝胁迫对柑橘实生幼苗生长的影响

Effects of Aluminum on the Growth of Young Citrus Seedlings

旨在鉴定和比较12个柑橘种类品种的耐铝性。每天用含0、0.2、0.6mmol/L、1.0mmol/L和1.6mmol/LAlCl3·6H2O的1/4Hoagland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。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,即使在最高铝浓度(1.6mmol/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,在最高铝浓度(1.6mmol/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(0.2mmol/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。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,枸头橙、酸橙、红木黎檬和枳柚的耐铝性较差,文旦柚耐铝性最差。

The objectives of this study were to determine and compare aluminum（Al）tolerance of 12 citruss pecies and cultivars.Seedlings of Citrus reticulata cv.Chachiensis,C.reticulata cv.Ponkan,C.reticulata cv.F uju,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,a nd citramelo（P.trifoliata×C.grandis）grown in pots containing sand were fertilized daily for 3 months withq uarter-strength Hoagland＇s solution at an Al concentration of 0,0.2,0.6,1.0 mmol/L or 1.6 mmol/L fromA lCl3·6H 2 O.＇Xuegan＇,＇Chachiensis＇,＇Ponkan＇,＇Fuju＇,＇Sichunongju＇,＇Eureka＇and P.trifoliata werer elative Al tolerant,whose dry weight of roots,shoots and whole plants was not affected by 1.6 mmol/L Al;＇ Goutoucheng＇,C.aurantium,C.limonia and citramelo were relative Al sensitive,whose growth of roots and/o r shoots was inhibited by 1.6 mmol/L Al＇.Wendanyou＇was the most Al sensitve of all these citrus speciesa nd cultivars and 0.2 mmol/L Al decreased significantly the dry weight of roots and whole plants.Al stressr esulted 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 o＇fPonkan＇,＇ Guotoucheng＇,＇Eureka＇,C.limonia,＇Wendanyou＇and citramelo seedlings.No significant difference wasf ound in the ratio of root dry weight to shoot dry weight of＇Xuegan＇seedlings among different treatmentse xcept for a significant dcrease in the lowest Al treatment＇.Xuegan＇,＇Chachiensis＇,＇Ponkan＇,＇Fuju＇,＇ Sichunongju＇＇,Eureka＇and P.trifoliata were relative Al tolerant＇;Goutoucheng＇,C.aurantium,C.limoniaa nd citramelo were relative Al sensitive;＇Wendanyou＇was the most Al sensitive of all these citrus species andc ultivars.