不同硼效率甘蓝型油菜苗期对硼镁营养的反应

利用溶液培养研究硼低效和高效甘蓝型油菜(Brassica.napus)苗期对硼镁营养的反应。结果表明,低硼浓度下提高镁时,油菜的生长受影响不大,硼含量和累积量降低,镁含量和累积量及叶绿素上升。低镁浓度下提高硼时,油菜镁含量、镁积累量降低,且硼低效品种降低幅度大于硼高效;叶绿素降低幅度则硼高效大于硼低效品种。高硼浓度下提高镁时,硼镁含量和累积量及叶绿素含量均提高,提高幅度为硼高效品种大于低效品种。高镁浓度下提高硼时,硼镁表现出显著的相互促进,硼高效品种促进效应大于低效品种。在很大程度上镁影响油菜叶绿素a的含量,而硼影响油菜叶绿素b的含量。硼镁营养对锌含量无大的影响;在低镁浓度下,油菜低效品种锰含量显著增加。无论是低镁或高镁浓度下提高硼,硼高效和低效品种铁含量均有所增加,低效品种增加显著。

Response of rape cultivars with different boron efficiency to boron-magnesium nutrition at seedling stage

Solution culture to studied the responses of two rape ( Brassica napus ) cultivars with different boron efficiency to boron-magnesium nutrition at seedling period. The results showed that increasing Mg concentration in the solution had no influence on the growth of two cultivars under lower B level. However, B content and B accumulation in plants decreased, and Mg content, Mg accumulation and chlorophyll content increased. Similarly, increasing B concentration under lower Mg level, Mg content, Mg accumulation and chlorophyll content decreased, the decreasing extent in the B-inefficient cultivar was larger than in the B-efficient cultivar, but chlorophyll content in B-efficient cultivar was larger than in the B-inefficient cultivar. When increasing B concentration in the solution under higher Mg level, there was a significant synergism between B and Mg. The effect of the synergism in the B-inefficient cultivar was less than in B-efficient cultivar. To a large extent, chlorophyll content in plant was tighter relative to Mg content, and less relative to B content. Boron-magnesium nutrition had no significant influence on Zn content. Under the low Mg condition, increasing B concentration could enhance Mn content significantly. At two Mg levels, increasing B concentration improved Fe nutrition of the two cultivars, however, Fe content in B-inefficiency cultivar raised significantly.