铝减轻过量锰对大豆生长的不利影响

Aluminum Lightens the Adverse Effects of Excessive Mn on Growth of Soybean (Glycine max)

以大豆为材料,研究了铝(Al)对过量锰(Mn)胁迫下大豆生理生化状况的影响。结果表明:Al抑制了植物对Mn的吸收运输,降低了Mn在地上部的积累,减轻了高Mn对大豆地上部生长的抑制程度、改善了叶片叶绿素含量降低的现象并降低了高Mn诱导产生的氧化胁迫伤害程度;此外,Al主要降低了叶片细胞壁和细胞器中Mn的含量,而对细胞可溶性组分中Mn含量没有影响。

The influence of aluminum （Al） on physiological and biological characteristics of soybean under manganese （Mn） stress was investigated. The results showed that Al suppressed the transport of Mn to shoots （Fig.2B, C）, and subsequently alleviated the inhibition of shoot growth （Fig. 1）, decreased the chlorophyll content （Fig.4）. Addition of Al diminished the increase in O2^- producing rate, the hydrogen peroxide （H202） content and malondialdehyde （MDA） content, and activities of superoxide dismutase （SOD）, guaiacol peroxidase （GPX）, ascorbate peroxidase （APX） in soybean leaves causedby excessive Mn （Fig.5）, and prevented the dropping of CAT activity to a low level under excessive Mn stress （Fig.6）. Results of fractional analysis indicated that high levels of Al supply deduced mainly accumulation of Mn both in cell walls and organelles, but had no effect on it in soluble fractions （Fig.3）.