紫娘喜荔枝果皮K、Ca和Mg含量变化对着色的影响

为探讨紫娘喜荔枝(Litchi chinensis)着色与果皮K、Ca和Mg含量变化的关系,以紫娘喜荔枝果皮为试材,通过对数据作典型性相关和一元指数函数回归分析,研究其K、Ca、Mg含量变化及其对叶绿素、花色素苷等含量的影响特点。结果表明:随着果皮不断转红,叶绿素含量呈显著下降趋势,而花色素苷含量却呈显著上升趋势;全K、水溶性K和全Ca、水溶性Ca含量分别呈下降和上升的趋势,水溶性Mg含量呈上升趋势,全Mg含量变化不显著,同期全K、Ca、Mg和水溶性K、Mg、Ca等含量分别呈依次递减趋势;花色素苷含量与全Ca和全K含量分别呈正和负相关的一元指数函数回归关系;叶绿素含量与水溶性Mg、全Ca和全K含量分别呈负、负和正相关一元指数函数回归关系。可见,全Ca含量较高是促进果皮转红的关键因素,研究结果可为制定紫娘喜荔枝合理施肥技术提供理论依据。

Effects of the changes in the contents of K, Ca and Mg in pericarp on the pericarp's coloring of Litchi chinensis cv. Ziniangxi

In order to study the characteristics of the changes in the contents of K,Ca and Mg in pericarp and its effects on the pericarp''s coloring of Ziniangxi litich,a study based on the pericarp was finished. The characteristics of the tendencies of the changes in the contents of K,Ca and Mg and the indicators of coloring in pericarp were detected,and the relationship between the changes in the contents of 3 kinds of mineral nutrients and the pericarp''s reddening were analyzed by the methods of the canonical correlation analysis and the unitary exponential regression analysis. The results in the course of the development of the pericarp''s reddening were as follows: The content of chlorophyll in pericarp decreased significantly while the content of anthocyanin in pericarp increased significantly. The contents of the total K,the water-soluble K and the total Ca,the water-soluble Ca generally dropped and rose respectively. The content of the water-soluble Mg generally rose. The content of the total Mg changed insignificantly. The contents of the total K,Ca and Mg and those of the water-soluble K,Mg and Ca respectively decreased significantly in sequence at the same time. The unitary exponential regression equations of the content of the anthocyanin to those of the total Ca and K respectively were both significant,and the correlation was respectively positive and negative. The unitary exponential regression equations of the content of the chlorophyll to those of the water-soluble Mg and the total Ca and K were all significant respectively,meanwhile,the former two were both negative,and the latter was positive. In summary,the higher content of the total Ca was the key factor improving the pericarp''s reddening,and it would guide to formulate the technical proposals on the fertilizer application for improving the pericarp''s reddening of Ziniangxi litchi.