作　　者： ; ; ; ; ;

机构地区： 华南农业大学农学院热带亚热带生态研究所

出　　处： 《中国生态农业学报》 2010年第3期486-491,共6页

摘　　要： 本文对比了两个不同转化事件的Bt玉米品种"5422Bt1"和"5422CBCL"及其同源常规玉米"5422"丛枝菌根真菌侵染率和叶片及根系氮、磷、钾养分含量的变化,并分析了丛枝菌根真菌侵染率和养分含量的相关性。结果表明,在观测期间,两个Bt玉米品种与常规玉米之间根系丛枝菌根真菌侵染率均无显著差异,但氮、磷、钾养分含量则明显不同,丛枝菌根真菌侵染率与养分含量之间的相关性也有所改变,其变化随玉米品种、生育期以及器官不同而不同。Bt玉米"5422Bt1"在大喇叭口期叶片全钾和根系全磷、开花授粉期叶片全磷和根系全氮、乳熟期叶片全钾以及成熟期叶片全磷和根系全氮、全钾含量均显著高于常规玉米"5422",而大喇叭口期和开花授粉期叶片全氮、开花授粉期根系全磷和全钾以及乳熟期根系全钾含量则低于常规玉米"5422"。Bt玉米"5422CBCL"在大喇叭口期叶片全钾和根系全氮及全钾、开花授粉期叶片全磷以及成熟期根系全氮和全钾含量显著大于常规玉米"5422",而开花授粉期根系全磷、乳熟期根系全磷和全钾以及成熟期叶片全磷含量则小于常规玉米"5422"。相关分析表明,常规玉米"5422"和Bt玉米"5422CBCL"的丛枝菌根真菌侵染率与根系全氮含量及叶片全钾含量之间均呈显著正相关(P<0.05),而Bt玉米"5422Bt1"则无显著相关性(P>0.05)。可见,与常规玉米"5422"相比,Bt玉米养分含量以及丛枝菌根真菌侵染率与养分含量之间相关关系与不同转化事件所形成的品种特性有关。 Changes in abuscular mycorrhizal fungi colonization rate and in nitrogen,phosphorus and potassium content in Bt corn ＂5422Bt11＂ and ＂5422CBCL＂ resulting from two different transformation events along with their non-transgenic isogenic lines ＂5422＂ were investigated.Meanwhile,the correlation between abuscular mycorrhizal fungi colonization rate and nutrient content was subjected to further analysis in this study.The results indicate no significant differences among three corn cultivars in abuscular mycorrhizal fungi colonization rate for the experiment period.Remarkable differences,however,exist between Bt and non-Bt corn in-terms of nitrogen,phosphorus and potassium content.Moreover,the correlation between abuscular mycorrhizal fungi colonization rate and nutrient content varies with corn variety,growth stage and plant organ.For Bt corn ＂5422Bt1＂,leaf total potassium and root total phosphorus at the large trumpet stage,leaf total phosphorus and root total nitrogen at flowering stage,leaf total potassium at milk stage,and leaf total phosphorus and root nitrogen and potassium at mature stage are significantly higher than those for the non-Bt corn ＂5422＂.On the contrary,leaf total nitrogen at large trumpet and flowering stages,root total phosphorus and potassium at flowering stage,and root total potassium at milk stage tend to decrease in Bt corn ＂5422Bt1＂.With regard to Bt corn ＂5422CBCL＂,leaf total potassium and root total nitrogen and potassium at large trumpet stage,leaf total phosphorus at flowering stage,and root total nitrogen and potassium at mature stage are evidently higher than those for the non-Bt corn ＂5422＂.However,root total phosphorus at flowering stage,root total phosphorus and potassium at milk stage,and leaf total phosphorus at mature stage are relatively lower than those for the non-Bt corn ＂5422＂.The analysis shows that abuscular mycorrhizal fungi colonization rate in non-Bt corn ＂5422＂ and Bt corn ＂5422CBCL＂ is positively correlated with root total ni

关 键 词： 玉米 丛枝菌根真菌 侵染率 植株养分含量

领　　域： [农业科学] [农业科学] [农业科学]