Dai Tingbo, Cao Weixing, Sun Chuanfan, Jiang Dong, Jing Qi
MOA, Key Laboratory of Crop Growth Regulation, Nanjing Agricultural University, Nanjing 210095, China.
Ying Yong Sheng Tai Xue Bao. 2003 Sep;14(9):1529-32.
A controlled hydroponics experiment was conducted to investigate the effects of three NH4+/NO3- ratios (0/100, 50/50 and 100/0) on the photosynthesis and the key nitrogen metabolism enzymes of three wheat cultivars with different sensitivity to enhanced ammonium nutrition (EAN). Compared with NO3- alone, EAN significantly increased the leaf chlorophyll content, net photosynthetic rate, and soluble sugar content. It also significantly increased the soluble protein content in leaves and roots and the nitrate reductase activity in leaves, but had no significant effect on Glutamine synthetase (GS) activity. EAN increased the soluble sugar content in leaves, and correspondingly, enhanced the net photosynthetic rate and maintained a higher soluble sugar/protein in leaves and roots, which was favorable to the nitrogen assimilation and plant growth.
进行了一项水培对照实验，以研究三种铵根离子/硝酸根离子比例（0/100、50/50和100/0）对三个对铵营养增强（EAN）敏感度不同的小麦品种光合作用和关键氮代谢酶的影响。与单独供应硝酸根离子相比，铵营养增强显著提高了叶片叶绿素含量、净光合速率和可溶性糖含量。它还显著增加了叶片和根系中的可溶性蛋白含量以及叶片中的硝酸还原酶活性，但对谷氨酰胺合成酶（GS）活性没有显著影响。铵营养增强增加了叶片中的可溶性糖含量，相应地提高了净光合速率，并使叶片和根系中保持较高的可溶性糖/蛋白质水平，这有利于氮同化和植物生长。
