The effects of Solidago canadensis water extracts on maize seedling growth in association with the biomass allocation pattern
The effects of Solidago canadensis water extracts on maize seedling growth in association with the biomass allocation pattern
复制标题
加拿大一枝黄花水提取物对玉米幼苗生长的影响与生物量分配模式的关系
作者：
Ye Xiao Qi;Meng Jin Liu;Wu Ming
背景加拿大一枝黄花是一种具有侵略性的外来植物，对竞争植物具有潜在的化感作用。在化感作用的研究中经常观察到毒物兴奋效应，然而，这种效应的机制需要阐明。化感物质可以通过改变受体植物的生物量分配模式或光合能力来影响受体植物的生长。本研究的目的是确定水如何从S. canadensis对受体植物地上部和根系生长的影响及其机制是否与生物量分配格局或光合气体交换能力有关。方法采用水提物法对S.将0-0.25 μ g/ml范围内的12种不同浓度的canadensis芽在9天内三次施加到在硅砂中培养的玉米幼苗上。比较了不同浓度处理对玉米幼苗生长（株高、叶长、叶面积和根长）和生物量积累与分配（比叶面积、叶面积比和叶质量比）的影响。在第一次施用之前和之后，测量并比较暴露于三种浓度的水提取物（0，0.0125和0.2g/ml）的玉米幼苗之间的气体交换（光合光响应曲线），并且在第三次和最后一次施用之后测量幼苗生长。结果浓度低于0.125g/ml时，对幼苗的生长（苗高、叶长、叶面积和根长）有促进作用，浓度高于0.125g/ml时，对幼苗生长有抑制作用（P < 0.05）。生物量积累与分配的变化规律与地上部生长规律相似，但水提液处理对生物量积累与分配的影响不显著（P > 0.05）。水提液处理对光合能力无显著影响（P > 0.05），但低剂量处理的暗呼吸速率高于高剂量处理。枝高与生物量分配指标SLA和LAR呈显著正相关（P < 0.05），与LMR无显著相关（P > 0.05）。结论丹参水提物对小鼠的抗氧化作用较强。对玉米幼苗的生长有很强的浓度依赖性，低浓度的水提取物对玉米幼苗的生长有促进作用。水浸提液对玉米幼苗生长的影响主要是通过对叶面积分配的影响，而对叶片气体交换量的影响不能解释幼苗生长的变化。因此，植物生长的刺激很可能是由于增加了生物量分配到地上部。
Background Solidago canadensis L. is an aggressive exotic plant species in China that has potential allelopathic effects on competing plant species. Effects of hormesis are frequently observed in studies of allelopathy; however, the mechanisms of such effects need to be elucidated. Allelopathic compounds may affect the growth of recipient plants via alteration of biomass allocation patterns or photosynthetic capacity. The aim of this study was to determine how water extracts from S. canadensis affected the shoot and root growth of recipient plants and whether the underlying mechanism was related to the biomass allocation pattern or photosynthetic gas exchange capacity. Methods The water extracts from S. canadensis shoots at 12 different concentrations in the range of 0–0.25 g/ml were applied thrice in 9 days to maize seedlings cultivated in silica sand. The growth (shoot height, leaf length and area and root length) and biomass accumulation and allocation (specific leaf area (SLA), leaf area ratio (LAR) and leaf mass ratio (LMR)) were compared among maize seedlings exposed to different treatment concentrations. Gas exchange (photosynthetic light response curve) was measured and compared among maize seedlings exposed to three concentrations of water extract (0, 0.0125 and 0.2 g/ml) before and after the first application, and seedling growth was measured after the third and final application. Results The growth of seedlings (shoot height, leaf length and area and root length) was promoted at concentrations below 0.125 g/ml and inhibited at concentrations above this level (P < 0.05). The pattern of change in biomass accumulation and allocation was similar to that of shoot growth, but biomass accumulation and allocation was not significantly affected by the water extract treatments (P > 0.05). The water extract treatments did not significantly affect the photosynthetic capacity (P > 0.05), but the dark respiration rate was higher in the low-dose treatment than that in the high-dose treatment. Shoot height was positively correlated with the biomass allocation indicators SLA and LAR (P < 0.05) but not with LMR (P > 0.05). Conclusions The results suggested that the effects of the water extracts from S. canadensis were highly dependent on the concentration, with the growth of maize seedlings promoted at low concentrations of water extracts. The effects of the water extracts on the growth of maize seedlings were mainly due to the effects on the LAR, the allocation to leaf area growth, whereas the effects of the water extracts on leaf gas exchange capacity cannot explain variation of seedling growth. Thus, the stimulation of plant growth was very likely due to increased biomass allocation towards the shoot.
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影响因子：
2.7
作者：
Yongge Yuan;B. Wang;Shanshan Zhang;Jianjun Tang;C. Tu;Shuijin Hu;J. Yong;Xin Chen
通讯作者：
Yongge Yuan;B. Wang;Shanshan Zhang;Jianjun Tang;C. Tu;Shuijin Hu;J. Yong;Xin Chen
DOI：
10.1111/j.1469-8137.2006.01964.x
发表时间：
2007-03
期刊：
The New phytologist
影响因子：
--
作者：
B. Prithiviraj;L. Perry;D. Badri;J. Vivanco
通讯作者：
B. Prithiviraj;L. Perry;D. Badri;J. Vivanco
影响因子：
2.3
作者：
Pereira, Marcio Paulo;de Almeida Rodrigues, Luiz Carlos;Pereira, Fabricio Jose
通讯作者：
Pereira, Fabricio Jose
DOI：
--
发表时间：
--
期刊：
--
影响因子：
--
作者：
S. Duke;N. Cedergreen;E. D. Velini;R. Belz
通讯作者：
S. Duke;N. Cedergreen;E. D. Velini;R. Belz
影响因子：
4
作者：
J. Lewis;D. Olszyk;D. Tingey
通讯作者：
J. Lewis;D. Olszyk;D. Tingey