铝胁迫对入侵植物北美车前生长特性和生物量分配的影响

Effects of aluminum stress on growth characteristics and biomass allocation of Plantago virginica

探讨了铝胁迫对入侵植物北美车前生长特性和生物量分配的影响。结果表明:低浓度(100 mg/L)的铝胁迫处理对北美车前的生长无显著影响,高浓度(2 000 mg/L)使植株叶片数减少、叶面积变小;短时间高浓度铝胁迫促进北美车前的抽穗数,长时间(30 d)铝胁迫处理后穗生长受到抑制,这种抑制作用在高浓度铝胁迫处理下表现尤其明显。随着铝胁迫程度的加剧,生物量分配存在由地下部转移至地上部的趋势。北美车前在高浓度铝胁迫下形成一种"集中抽穗"模式,这可能是其在生存过程中对不利环境的一种适应行为。

The objective of the present investigation is to observe the effects of different Al3＋ concentration（100,500,800,2 000 mg/L） along with different duration times（10,20,30 d） on growth characteristics and biomass allocation of the invasive plant P.virginica.The results showed that 100 mg/L of Al3＋ had little effect on the growth of P.virginica.Under 2 000 mg/L of Al3＋,both leaf areas and leaf numbers of P.virginica decreased.Spike number of P.virginica was promoted under 2 000 mg/L Al3＋ stress for a short treatment time,but its growth velocity was inhibited over a long period 2 000 mg/L.With aggravating Al3＋ stress,a trend was found that its biomass allocation prefered aboveground to underground.The proportion of its spikes increased rapidly to a peak and then declined rapidly over the subsequent days under high concentration of Al3＋,revealing an adaptive strategy for its reproducing during unfavorable circumstances.