PHYSIOLOGICAL ECOLOGY OF RIVERSIDE SPECIES - ADAPTIVE RESPONSES OF PLANTS TO SUBMERGENCE
PHYSIOLOGICAL ECOLOGY OF RIVERSIDE SPECIES - ADAPTIVE RESPONSES OF PLANTS TO SUBMERGENCE
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DOI：
10.1006/anbo.1994.1116
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发表时间：
1994-09-01
期刊：
影响因子：
4.2
通讯作者：
VISSER, EJW
中科院分区：
文献类型：
--
作者：
BLOM, CWPM;VOESENEK, LACJ;VISSER, EJW
在河流漫滩，洪水条件的变化导致的演替阶段的殖民地，从一年生的先驱者长寿的多年生植物。从中间演替带的物种淹没的反应进行了比较，从其他区域的物种的适应性反应。存在和丰富度与海拔高度，可以解释的生物量生产的特点，并恢复在响应各种淹没intensity.Rumex物种，从早期到晚期的演替阶段，作为模型来阐明，更详细地说，适应机制。耐淹树种在淹水和暴露于低氧条件下会产生大量不定根。由于通过通气组织的内部氧气运输，这些根周围的土壤被再氧化，从而刺激细菌硝化。乙烯和生长素促进不定根。增加叶柄伸长也是耐淹酸模属物种的适应特征。种间淹水诱导生长的差异不仅由内源乙烯水平的变化控制，而且还由对这种激素的不同敏感性控制。生长素不影响鲁梅克斯叶柄的伸长，但赤霉素有明显的积极作用。显然，淹水诱导了抗腐酸模叶柄对赤霉素和乙烯的更高敏感性。许多淹水反应也可以通过限制氧气供应来诱导，这表明低氧可能是一个触发因素。我们研究的酸模属物种代表了各种不同的群落。因此，在这些模式植物中观察到的生理生态现象也可以解释其他物种的过程和模式，因此在滨江社区水平上是可以解释的。
In river floodplains, variation in flooding conditions results in successional stages in colonization ranging from annual pioneers to long-lived perennials. Reactions to submergence of species from the mid-successional zone are compared with adaptive responses of species from other zones. Presence and abundance are related to elevation and can be explained by characteristics of biomass production, and recovery in response to various submergence intensities.Rumex species, from early to late successional stages, serve as models to elucidate, in more detail, mechanisms of adaptation. Flooding-resistant species develop large numbers of adventitious roots upon submergence and exposure to low oxygen conditions. Due to internal oxygen transport through aerenchyma, soil around these roots is reoxidized, which stimulates bacterial nitrification. Ethylene and auxin promote adventitious rooting. Increased petiole elongation is also an adaptive feature of submergence-resistant Rumex species. Differences between species in submergence-induced growth are not only controlled by variation in endogenous levels of ethylene but also by different sensitivities to this hormone. Auxin does not affect Rumex petiole elongation, but a clear positive effect of gibberellin is demonstrated. Apparently, submergence induces a higher sensitivity to gibberellin and ethylene in the petioles of flooding-resistant Rumex Many of the submergence reactions can also be induced by restricting the oxygen supply, suggesting that low-oxygen might be a triggering factor. The Rumex species we study represent various distinct communities. Thus, the ecophysiological phenomena observed in these model plants may explain processes and patterns in other species too and thus are interpretable at the riverside community level.