Qi You-Ling, Zhang Fu-Cang, Li Kai-Feng
Ministry of Education Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Northwest A & F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2009 Oct;20(10):2399-405.
Winter wheat plants were cultured in vitro tubes to study their growth and nitrogen uptake under effects of water deficit at different growth stages and nitrogen fertilization. Water deficit at any growth stages could obviously affect the plant height, leaf area, dry matter accumulation, and nitrogen uptake. Jointing stage was the most sensitive stage of winter wheat growth to water deficit, followed by flowering stage, grain-filling stage, and seedling stages. Rewatering after the water deficit at seedling stage had a significant compensation effect on winter wheat growth, and definite compensation effect was observed on the biomass accumulation and nitrogen absorption when rewatering was made after the water deficit at flowering stage. Under the same nitrogen fertilization levels, the nitrogen accumulation in root with water deficit at seedling, jointing, flowering, and grain-filling stages was reduced by 25.82%, 55.68%, 46.14%, and 16.34%, and the nitrogen accumulation in aboveground part was reduced by 33.37%, 51.71%, 27.01%, and 2.60%, respectively, compared with no water deficit. Under the same water deficit stages, the nitrogen content and accumulation of winter wheat decreased with decreasing nitrogen fertilization level, i. e., 0.3 g N x kg(-1) FM > 0.2 g N x kg(-1) FM > 0.1 g N x kg(-1) FM. Nitrogen fertilization had obvious regulation effect on winter wheat plant growth, dry matter accumulation, and nitrogen uptake under water stress.
通过在试管中对冬小麦植株进行培养，研究不同生长阶段水分亏缺和施氮条件下冬小麦的生长及氮素吸收情况。任何生长阶段的水分亏缺都会显著影响株高、叶面积、干物质积累和氮素吸收。拔节期是冬小麦生长对水分亏缺最敏感的阶段，其次是开花期、灌浆期和苗期。苗期水分亏缺后复水对冬小麦生长有显著的补偿效应，开花期水分亏缺后复水对生物量积累和氮素吸收也有一定的补偿效应。在相同施氮水平下，与不亏水相比，苗期、拔节期、开花期和灌浆期水分亏缺时，根系氮积累分别减少25.82%、55.68%、46.14%和16.34%，地上部氮积累分别减少33.37%、51.71%、27.01%和2.60%。在相同水分亏缺阶段，冬小麦的氮含量和积累量随施氮水平降低而降低，即0.3 g N x kg(-1) FM > 0.2 g N x kg(-1) FM > 0.1 g N x kg(-1) FM。水分胁迫条件下，施氮对冬小麦植株生长、干物质积累和氮素吸收有明显的调控作用。
