CAJ | 학술논문

采用溶液培养的方法，研究了低氮胁迫下不同糜子品种苗期生物学性状、氮素吸收利用效率差异及与根系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。
채용용액배양적방법，연구료저담협박하불동미자품충묘기생물학성상、담소흡수이용효솔차이급여근계형태생리지표지간적상관관계。결과표명，저담협박하，미자지상부생장수억정도대우근부，식주담루적량강저단담이용효솔명현제고。진서7호주고、협면적、경협간중、근간중、총근수、총흡수면적화활성흡수면적하강폭도재소측시품충중균최소，기총담루적량분별시진서1호、진서5호、진서8호적1.35、1.50、1.39배，근계담루적량/총담량적백분솔증가적폭도화지상부담루적량/총담량적백분솔하강적폭도균최저，분별위9.75％화3.47％；식주담이용효솔비진서1호、진서5호、진서8호분별고20.92％、12.44％、14.83％。진서7호교기타품충경내저담협박。저담협박하，미자근계간중、총근장、총흡수면적여총담루적량정현저선성상관，표명저담협박하，근계형태생리지표대담소흡수효솔기중요작용。
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 .