植物营养与肥料学报2014,20(3）：661-669 Journal of Plant Nutrition and Fertilizer
doi=10.11674/zwyf.2014.0318
不同糜子品种对低氮胁迫的生物学响应
张美俊'，乔治军2”，杨武德'，冯美臣'，肖璐洁'，王冠，段云'（1山西农业大学农学院，山西太谷030801；2山西省农业科学院农作物品种资源研究所，山西太原030031）
形态生理指标之间的相关关系。结果表明，低氮胁迫下，糜子地上部生长受抑程度大于根部，植株氮累积量降低但氮利用效率明显提高。晋黍7号株高、叶面积、茎叶干重、根干重、总根数、总吸收面积和活性吸收面积下降幅度在所测试品种中均最小，其总氮累积量分别是晋黍1号、晋黍5号、晋黍8号的1.35、1.50、1.39倍，根系氮累积量/总氮量的百分率增加的幅度和地上部氮累积量/总氮量的百分率下降的幅度均最低，分别为9.75%和 3.47%；植株氮利用效率比晋黍1号、晋黍5号、晋黍8号分别高20.92%、12.44%、14.83%。晋黍7号较其他品种更耐低氮胁迫。低氮胁迫下，糜子根系干重、总根长、总吸收面积与总氮累积量呈显著线性相关，表明低氮胁
迫下，根系形态生理指标对氮素吸收效率起重要作用。关键词：糜子；低氮胁迫：生物学性状；氮效率
中图分类号：S516；S311
文献标识码：A
文章编号：1008505X(2014)03066109
Biological responseof differentcultivars of millettolownitrogenstress
ZHANG Meijun', QIAO Zhi-jun*, YANG Wu-de', FENG Mei-chen'
XIAO Lu-jie', WANG Guang', DUAN Yun'
(I College of Agronomy, Shanxi Agricultural University, Taigu 030801, China;
2 Institute of Germplasm Resources, Shanri Academy of Agricultural Sciences, Taiyuan 030031, China)
Abstract: A solution culture experiment was carried out to study the biological trait , the different responses in N uptake and utilization efficiency of four cultivars of millet under low nitrogen stress , the correlation between N uptake and morphological and physiological traits of root system were also discussed . The results show that under low nitrogen stress, the shoot growth of millet was restrained earlier than roots . The N uptake was decreased, but the general efficiency of N increased drastically . The mildest restrain in plant height , leaf area, shoot and root dry weight, total root length, root number, total and active uptake area was in cultivar Jinshu 7. The total N uptake of Jinshu 7 was 1.35, 1. 50, 1. 39 times of those of Jinshu 1. Jinshu 5, Jinshu 8, accordingly, its N efficiency was 20.92% , 12.44% , 14.83% of the other three cultivars respectively. The increase of the percentage of root N uptake and the decrease of shoot N uptake to total N uptake in Jinshu 7 was 9. 75% and 3. 47% respectively, which was also smallest among the cultivars tested . Therefore , Jinshu 7 was identified as the typical cultivar tolerant to low nitrogen stress. The results also showed a significant positive correlation between total N uptake and dry weight, length, total and active uptake area in roots under low nitrogen stress , this correlation dose not exist under high nitrogen, indicating that the morphological and physiological traits of root system plays a vary important role in N uptake under low nitrogen stress.
Key words milletlow nitrogen stress biological traitnitrogen efficiency
收稿日期：2013-03-25
接受日期：2014-02-16
基金项目：国家现代农业产业技术体系糜子裁培岗位项目（CARS-07-12.5-A12）：山西省自然科学基金项目（2012011030-2）资助。作者简介：张美俊（1970—），女，山西河曲人，博士，副教授，主要从事作物生态与早作农业研究。E-mail：meijunz@126.com
*通信作者Tel;03517967015，E-mail：nkypzs@yahoo.com.en