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