未成熟果实黄化蜜柑及其正常植株叶片和果实矿质含量差异分析(英文)

Different Concentrations of Mineral Nutrients in Leaves and Fruits From Both Immature Fruit Chlorosis and Normal Satsuma Mandarin Trees

对未成熟果实黄化‘龟井’温州蜜柑和正常植株叶片和果实大量矿质元素如钾(K)、钙(Ca)、镁(Mg)、磷(P)、硫(S)及微量矿质元素如铁(Fe)、锰(Mn)、锌(Zn)、铜(Cu)和硼(B)含量进行了测定分析。结果表明:果实黄化蜜柑叶片K和Ca含量(P<0.01)极显著低于正常植株(对照)、P、S和B含量(P<0.05)亦显著较低,且Ca和B均低于缺乏临界值,而Mn含量(P<0.01)却极显著高于对照;果实黄化蜜柑果实S和B含量(P<0.01)极显著低于对照,Ca和Mg含量(P<0.05)亦显著较低,而P含量(P<0.05)却显著高于对照;果实黄化蜜柑与正常植株间叶片和果实Fe、Zn、Cu及果实Mn含量均无显著性差异.可见,‘龟井’温州蜜柑未成熟果实黄化症状与其果实含Mg量显著较低及因Ca、B缺乏造成的叶片功能衰退有着密切的关系.

Concentrations of macronutrients such as potassium（K）, calcium （Ca）, magnesium （Mg）, phosphorus（P）, sulfur（S）, and micronutrients such as iron（Fe）, manganese（Mn）, zinc（Zn）, copper （Cu） and boron（B） were determined in leaves and fruits from both immature fruit chlorosis and normal ＇kamei＇ satsuma mandarin （ Citrus unshiu Marc. ） trees. Results showed that leaf samples collected from fruit-eholorisis trees contained significantly lower K（ P 〈 0.01）, Ca （ P 〈 0.01）, P（ P 〈 0.05）, S（P 〈0. 05）, and B（P 〈0. 05） than those collected from normal ones（control）. Furthermore, leaf Ca and B concentrations were below the threshold limits for sufficiency, whereas significantly higher Mn concentration （ P 〈 0.01） was observed in leaves sampled from fruit-chlorosis trees than those from control. S and B concentrations （ P 〈 0.01 ） in fruits of fruit-chlorosis trees were markedly lower than those in fruits of control. Ca and Mg concentrations （ P 〈 0.05 ） were notably lower in chlorotic fruits compared with the control, whereas P （ P 〈 0.05） was distinctly higher than in control. No significant difference was found among concentrations of Fe, Zn and Cu in leaves and fruits, of Mn in fruits from both fruit-chlorisis and normal trees. The results above indicated that immature fruit chlorosis of satsuma mandarin is closely related to the declining function of leaves with lacking Ca and B. In addition, significantly lower concentration of Mg in affected fruits from trees might be another important reason for immature fruit chlorosis.