School of Urban and Environmental Science, Huaiyin Normal University Huaian, China.
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences Changchun, China.
Front Plant Sci. 2014 Oct 2;5:515. doi: 10.3389/fpls.2014.00515. eCollection 2014.
Two varieties of maize (Zea mays L.) grown in fields in black soils of northeast China were tested to study the dynamic changes of nitrogen metabolism and antioxidant enzyme activity in tassels of maize. Results showed that antioxidant enzyme activity in tassels of maize increased first and then decreased with the growing of maize, and reached peak value at shedding period. Pattern of proline was consistent with antioxidant enzyme activity, showing that osmotic adjustment could protect many enzymes, which are important for cell metabolism. Continuous reduction of soluble protein content along with the growing of maize was observed in the study, which indicated that quantitative material and energy were provided for pollen formation. Besides, another major cause was that a large proportion of nitrogen was used for the composition of structural protein. Nitrate nitrogen concentrations of tassels were more variable than ammonium nitrogen, which showed that nitrate nitrogen was the favored nitrogen source for maize.
两种在中国东北黑土地区种植的玉米（Zea mays L.）被用于研究玉米雄穗氮代谢和抗氧化酶活性的动态变化。结果表明，玉米雄穗抗氧化酶活性随玉米生长先增加后减少，在散粉期达到峰值。脯氨酸的模式与抗氧化酶活性一致，表明渗透调节可以保护许多对细胞代谢很重要的酶。研究中发现，随着玉米的生长，可溶性蛋白含量持续减少，这表明为花粉形成提供了定量的物质和能量。此外，另一个主要原因是大量的氮用于组成结构蛋白。雄穗中的硝态氮浓度比铵态氮变化更大，这表明硝态氮是玉米的首选氮源。
