LaCl_3对硝态氮供应下小麦根系生长的影响  

Effects of Lanthanum Chloride Addition on Root Growth of Wheat Plants Grown under Different Concentrations of Nitrate Supply

作　　者：江华波[1,2] 王盛锋[1] 高丽丽[1] 陈磊[3] 黄金生[4] 乙引[2] 汪洪[1] 

机构地区：[1]中国农业科学院农业资源与农业区划研究所/农业部植物营养与肥料重点实验室,北京100081 [2]贵州师范大学生命科学院,贵州贵阳550001 [3]黑龙江省农业科学院,黑龙江哈尔滨150086 [4]广西农业科学院农业资源与环境研究所,广西南宁530007

出　　处：《中国稀土学报》2013年第4期495-502,共8页Journal of the Chinese Society of Rare Earths

基　　金：北京市自然科学基金项目(6112021);国家重点基础研究发展计划课题(2013CB127402)资助

摘　　要：选择石麦15、衡观35两个品种小麦为供试作物,进行营养液培养,研究不同浓度硝态氮供应下Ca2+通道阻断剂LaCl3对小麦苗期根系形态特征的影响。结果表明:添加Ca2+通道阻断剂LaCl3后,3种浓度硝态氮处理的小麦根系初生根长度、侧根长度、根系总长度、侧根平均长度均较不添加LaCl3处理显著变短;直径(>0.45 mm)范围内根系所占比例增加。不施用硝态氮条件下,与不添加LaCl3处理相比,LaCl3处理对小麦植株地上部NO3-含量变化不大,但一级侧根数量明显减少,2.5和50.0 mmol.L-1硝态氮施用时,LaCl3处理侧根分布密度增加,衡观35较石麦15更明显。结论初步认为:Ca2+通道阻断剂LaCl3施用,影响小麦根系生长发育:根系伸长受抑,根系变粗,若施用硝态氮,侧根数量分布增加。A nutrient solution culture experiment was conducted to study effects of Ca2＋ channel blocking agent（lanthanum chloride） addition on root growth and development of wheat plants under different concentrations of nitrate supply.The two wheat cultivars including Shimai 15（SM15） and Hengguan 35（HG35） were selected as the tested crops.The results showed that the length of primary roots,lateral roots,and total roots and the average length of lateral roots were shorter with lanthanum chloride addition than without lanthanum chloride whatever nitrates were applied to nutrient solution,however.The proportion of roots with diameter 0.45 mm in the total root length increased with lanthanum chloride addition.Lanthanum chloride supply reduced significantly lateral root number of wheat plants without nitrate and increased the distribution density of lateral roots of plants with 2.5 and 50.0 mmol · L-1 concentrations of nitrates,which were greater in HG35 than SM15.It is suggested that the thicker roots and inhibition root elongation of wheat plants would be resulted from Ca2＋ channel blocking agent lanthanum chloride addition.With nitrate application,lanthanum chloride treatment would lead to more distribution density of lateral roots in primary roots.

关 键 词：小麦 硝态氮 根系 CA2+通道 LACL3 

分 类 号：Q945.12[生物学—植物学]