【摘要】 溶液培养条件下研究硼对不同硼效率棉花品种根系参数、伤流量及伤流液组分的影响。结果表明,缺硼抑制棉花根系生长,根重、根体积、根长、活跃吸收面积、总吸收面积、活跃吸收面积占总吸收面积的比例以及伤流量均显著降低,高效品种降低幅度比低效品种小;缺硼还使高效品种根系比表面积升高,而低效品种无显著变化。缺硼显著影响不同棉花品种伤流液各组分含量,与低效品种相比,高效品种伤流液中有较多的NO3-、K+、无机磷、可溶性糖和游离氨基酸。说明缺硼条件下高效品种根系比低效品种具有更强的吸收、代谢活力,可能是其硼效率较高的主要原因之一。更多还原

【Abstract】 The differences of the root characters and the composition of root bleeding sap between two B-efficient cotton cultivars and two B-inefficient ones were studied under solution cultivation.The root growth and development of all cotton cultivars was inhibited by B deficiency,for examples,the weight, volume,active and total absorption area of their roots were decreased significantly,and those of B-inefficient cultivars declined more seriously than the B-efficient ones.The ratio of root absorption area to root volume of the B-efficient cultivars was increased by boron deficiency,while that of the B-inefficient ones was not markedly changed.The amount of bleeding sap in the cotton cultivars was seriously depressed by B deficiency,but with higher intensity in B-inefficient ones.The total amount of NO^-₃,K⁺,inorganic phosphorus,soluble sugar and free amino acid in the bleeding sap of B-efficient cultivar was more than of B-inefficient one under the stress of B deficiency.The results suggested the capability of absorption and metabolism in the roots of B-efficient cotton cultivar was greater than that of B-inefficient one in low B supply,which might be an important reason that B efficiency was different between cotton cultivars.更多还原