氮磷钾、硼水平对不同基因型油菜硼吸收及某些生物学性状的影响

Effect of NPK and B supply levels on boron uptake and biological properties of different genotypic oilseed rape.

采用温室土培试验 ,研究了不同氮磷钾复合肥 (NPK肥 )施用水平下 ,油菜对B的吸收及其耐缺B机理以及缺B对某些生物学性状的影响 .结果表明 ,缺B时 ,随NPK肥施用量的增加 ,油菜植株缺B症状加重 ,苗期叶面积及其生长速率减小 ,叶绿素含量增加 ,硝酸还原酶活性下降 ;成熟期单株有效分枝、有效角果数减少 ,籽粒产量降低 .可以认为 ,油菜大苗期最新展开叶 (YOL)与最新成熟叶 (YML)的B浓度比值可作为不同基因型油菜植株体内B移动性大小的判据指标 .B移动性及B利用率的大小是不同基因型油菜耐缺B的重要营养机理之一 .

Pot experiment was conducted to study the boron absorption by oilseed rape(Brassica napus),the mechanism of its resistance to boron deficiency,and the effect of boron deficiency on its biological properties under different NPK supply levels.The results indicated that under boron deficiency,increasing NPK supply aggravated boron deficiency symptoms,which led to the decrease of leaf area and its growth rate and nitrate reductase activity(NRA) and the increase of chlorophyll(a+b) content at seedling stage,and the decrease of the number of productive branches and pods of each plant and seed yield at maturity.It was suggested that the ratio of boron concentration in youngest open leaves(YOL)to youngest mature leaves(YML) at seedling stage could be an index to judge the boron mobility in plants of different genotypic oilseed rape.Boron mobility and its utilization efficiency were one of the important nutritional mechanisms responsible for the difference in response of different genotypic oilseed rapes to boron deficiency.