湖北农业科学 ›› 2020, Vol. 59 ›› Issue (8): 21-24.doi: 10.14088/j.cnki.issn0439-8114.2020.08.004

• 育种·栽培 • 上一篇    下一篇

干旱胁迫下氮素对小麦幼苗生长及光合生理的影响

吴秀宁1, 刘英2, 王新军1, 赵志新1, 赵鹏3   

  1. 1.商洛学院健康管理学院,陕西 商洛 726000;
    2.宁强县第二中学,陕西 汉中 724400;
    3.西北大学生命科学学院,西安 710127
  • 收稿日期:2019-09-25 出版日期:2020-04-25 发布日期:2020-07-03
  • 作者简介:吴秀宁(1987-),女,山东嘉祥人,讲师,硕士,主要从事高产栽培与耕作模式优化研究,(电话)15291670608(电子信箱) wuxiuning1988@163.com。
  • 基金资助:
    陕西省教育厅专项科学研究计划项目(18JK0251); 商洛学院秦岭植物良种繁育中心专项科研经费项目

Effects of nitrogen on growth and physiological characteristics of wheat seedlings under drought stress

WU Xiu-ning1, LIU Ying2, WANG Xin-jun1, ZHAO Zhi-xin1, ZHAO Peng3   

  1. 1. College of Health Management, Shangluo University, Shangluo 726000,Shaanxi,China;
    2. Ningqiang County No.2 Middle School, Hanzhong 724400, Shaanxi, China;
    3. College of Life Sciences, Northwest University, Xi'an 710127, China
  • Received:2019-09-25 Online:2020-04-25 Published:2020-07-03

摘要: 以小麦品种商麦5226和小偃15为材料,设置低氮、中氮和高氮3个氮素水平(0.5、8.0、15.0 mmol/L),PEG-6000模拟干旱处理,测定不同水氮耦合处理下小麦生长指标、光合生理参数和叶绿素含量的变化。结果表明,中度干旱胁迫下,小麦最大根长、净光合速率、叶绿素含量表现为高氮>中氮>低氮,苗高、气孔导度为中氮>高氮>低氮;严重干旱胁迫下,最大根长表现为低氮>中氮>高氮,净光合速率、叶绿素含量均表现为中氮>高氮>低氮;2个干旱处理下,根冠比均表现为低氮>中氮>高氮,胞间CO2浓度为高氮>低氮>中氮。适度氮素处理能增强小麦幼苗生长和光合作用能力,对干旱胁迫具有一定的补偿效应。

关键词: 小麦幼苗, 氮素, 干旱胁迫, 生长指标, 光合生理

Abstract: The changes of growth indexes, physiological characteristics and chlorophyll content in wheat seedling leaves under different water-nitrogen coupling were determined. The wheat cultivars, namely Shangmai 5226 and Xiaoyan 15, were treated with 3 nitrogen levels low nitrogen, medium nitrogen, high nitrogen(0.5、8.0、15.0 mmol/L) and drought treatment simulated by PEG-6000. The results showed that, under moderate drought stress, maximum root length, net photosynthetic rate and chlorophyll content were high nitrogen > medium nitrogen > low nitrogen, seedling height and stomatal conductance were medium nitrogen > high nitrogen > low nitrogen; under severe drought stress, maximum root length showed low nitrogen>medium nitrogen>high nitrogen, net photosynthetic rate and chlorophyll content were medium nitrogen>high nitrogen>low nitrogen; under two drought treatments, root-shoot ratio was low nitrogen > medium nitrogen > high nitrogen, and intercellular CO2 concentration was high nitrogen > low nitrogen > medium nitrogen. Moderate nitrogen could enhance the growth and photosynthetic capacity of wheat seedlings, indicating that nitrogen had a certain compensatory effect on drought stress.

Key words: wheat seedlings, nitrogen, drought stress, growth indexes, physiological characteristics

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