土壤水分和供硼状况对不同硼效率油菜苗期生长、水分含量和硼形态的影响

通过土培试验,研究了土壤水分和供硼状况对不同硼效率油菜苗期生长、叶片水分含量和硼形态的影响.结果表明:低水分胁迫条件下,硼高效甘蓝品种和硼低效甘蓝品种在高供硼水平下的单株鲜质量比低供硼水平分别增加了43.1%和31.7%,但品种间没有显著差异;硼高效品种在两种供硼水平下的束缚态水分含量分别比低效品种高11.4%和1.7%,半束缚态硼分配比例分别比低效品种高6.9%和23.8%.正常水分条件下,硼高效甘蓝品种和硼低效甘蓝品种在高供硼水平下的单株鲜质量比低供硼水平分别增加了11.1%和27.4%;硼高效品种在两种供硼水平下的自由态水分含量较硼低效品种多,自由态硼累积量为低效品种的2倍多,这有利于硼在高效植物体内的移动运输.

Effects of soil moisture and boron supply on the plant growth and leaf water content and boron forms of oilseed rape cultivars with different boron use efficiency at their seedling stage

The study with pot experiment showed that under the stress of low soil moisture content,the oilseed rape cultivars with high and low boron(B)use efficiency had a higher fresh mass per plant at their seedling stage under high B supply,compared with those under low B supply.The increment was 43.1% and 31.7%,respectively,but no significant difference was observed between the cultivars.Under two B supply levels,the bound water content and semi-bound B distribution proportion in the leaves of the cultivar with high B use efficiency were 11.4% and 1.7%,and 6.9% and 23.8% higher than those of the cultivar with low B use efficiency,respectively.Under normal soil moisture condition,high B supply induced an increase of fresh mass per plant by 11.1% for the cultivar with high B use efficiency and by 27.4% for the cultivar with low B use efficiency,compared with low B supply.Under these two B supply levels,the cultivar with high B use efficiency had a higher content of free water in its leaves,and its leaf free B content was 2 times as much as that of the cultivar with low B use efficiency,which would benefit the B transportation in plant.