Background and Aims: Rootstocks play an essential role in grapevine scion growth and development. They influence water and nutrient uptake and affect biomass allocation of the scion and the grape berry composition connected with wine quality. Nitrogen (N) can be taken up by the roots in various forms such as nitrate, ammonium or urea. These N‐forms and their possible differential assimilation directly and indirectly influence grapevine vegetative and generative growth. N assimilation is driven by N acquiring enzymes such as nitrate reductase (NR), nitrite reductase (NiR) and glutamine synthetase (GS). This assimilation physiology can be influenced by factors such as light conditions or substrate availability.

中文翻译：

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氮素形态和时间响应对葡萄砧木氮同化关键酶的表达

背景和目的：砧木在葡萄接穗的生长和发育中起着至关重要的作用。它们影响水和养分的吸收，并影响接穗和葡萄浆果组成的生物量分配与葡萄酒品质。氮（N）可以以各种形式（例如硝酸盐，铵或尿素）被根部吸收。这些N型及其可能的差异同化直接或间接影响葡萄的营养生长和生殖生长。N吸收是由N获取酶（例如硝酸还原酶（NR），亚硝酸还原酶（NiR）和谷氨酰胺合成酶（GS））驱动的。这种同化生理会受到诸如光照条件或底物可用性等因素的影响。