单性结实和自花授粉结实柑橘果实发育中硼镁营养动态的研究

以单性结实的龟井温州蜜柑和自花授粉结实的鄂柑1号橘为试材,对整个果实发育期的子房(幼果)、果皮和果肉的硼镁含量变化进行了测定。结果表明:1)龟井花前至花期子房硼含量就已较高,花后下降;而鄂柑1号花期子房硼含量相对较低,花后有一显著上升;两品种子房(幼果)镁含量变化无明显差异,花后均趋下降。2)两品种果皮硼含量变幅较小,而果肉硼含量变幅相对较大,且均在果实膨大期出现明显的上升高峰;两品种果皮和果肉镁含量在果实发育前期均相对较高,在果实发育的中后期则趋明显下降。

Studies on Dynamics of Boron and Magnesium Nutrients During Fruit Development of Parthenocarpy and Self-pollinated Citrus Cultivars

Changes in concentrations of boron (B) and magnesium (Mg) in the ovary (fruitlet),rind and pulp of fruit were investigated throughout fruit development of parthenocarpic Kamei satsuma mandarin ( Citrus unshiu Marc.) and self-pollinated Egan 1 tangerine ( C.reticulata Blanco).The results showed as follows:1) B concentrations in the ovary of Kamei were at high levels before flowering and at full bloom,and decreased after flowering,whereas that of Egan 1 was relatively low at full bloom,thereafter significantly increased.No significant differences were observed in Mg changes in the ovary (fruitlet) between the two cultivars,which presented decreasing trends after flowering.2) Minor changes of B concentrations in the rind of the two cultivars were detected,remarkable changes were found for B in the pulp,which came to the peak values during the stage of fruit enlargement.Mg concentrations were relatively high in the rind and pulp of the two cultivars during early fruit development,and presented obviously declining trends during the middle and late stage of fruit development.