Garde-Cerdán T, López R, Portu J, González-Arenzana L, López-Alfaro I, Santamaría P
Instituto de Ciencias de la Vid y del Vino (Gobierno de La Rioja-CSIC-Universidad de La Rioja), Ctra. Mendavia-Logroño NA 134, Km. 90, 26071 Logroño, La Rioja, Spain.
Instituto de Ciencias de la Vid y del Vino (Gobierno de La Rioja-CSIC-Universidad de La Rioja), Ctra. Mendavia-Logroño NA 134, Km. 90, 26071 Logroño, La Rioja, Spain.
Food Chem. 2014 Nov 15;163:136-41. doi: 10.1016/j.foodchem.2014.04.101. Epub 2014 May 9.
The aim of this work was to study the influence of foliar application of different nitrogen sources on grape amino acid content. The nitrogen sources applied to Tempranillo grapevines were proline, phenylalanine, urea, and two commercial nitrogen fertilisers, both without and with amino acids in their formulations. All treatments were applied at veraison and one week later. Proline treatment did not affect the must nitrogen composition. However, phenylalanine and urea foliar application enhanced the plants' synthesis of most of the amino acids, producing similar effects. In addition, the spray of commercial nitrogen fertilisers over leaves also induced a rise in grape amino acid concentrations regardless of the presence or absence of amino acids in their formulation. The most effective treatments were phenylalanine and urea followed by nitrogen fertilisers. This finding is of oenological interest for improved must nitrogen composition, ensuring better fermentation kinetics and most likely enhancing wine quality.
这项工作的目的是研究叶面喷施不同氮源对葡萄氨基酸含量的影响。应用于丹魄葡萄藤的氮源有脯氨酸、苯丙氨酸、尿素以及两种商业氮肥，这两种商业氮肥一种配方中不含氨基酸，另一种含有氨基酸。所有处理均在转色期和一周后进行。脯氨酸处理对葡萄汁的氮组成没有影响。然而，叶面喷施苯丙氨酸和尿素增强了植物对大多数氨基酸的合成，产生了相似的效果。此外，无论配方中是否含有氨基酸，在叶片上喷施商业氮肥也会导致葡萄氨基酸浓度升高。最有效的处理方法是苯丙氨酸和尿素，其次是氮肥。这一发现对于改善葡萄汁的氮组成、确保更好的发酵动力学以及极有可能提高葡萄酒品质具有酿酒学意义。
