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Influence of light, dark, temperature and drought on metabolite and ion composition in nectar and nectaries of an epiphytic bromeliad species (Aechmea fasciata).
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-18 , DOI: 10.1111/plb.13150 T Göttlinger 1 , G Lohaus 1
中文翻译：
光，暗，温度和干旱对附生凤梨科植物（Aechmea fasciata）花蜜和蜜腺中代谢产物和离子组成的影响。
更新日期：2020-06-18
Plant Biology ( IF 4.2 ) Pub Date : 2020-06-18 , DOI: 10.1111/plb.13150 T Göttlinger 1 , G Lohaus 1
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- Research into the influence of stress factors, such as drought, different temperatures and/or varied light conditions, on plants due to climate changes is becoming increasingly important. Epiphytes, like many species of the Bromeliaceae, are particularly affected by this, but little is known about impacts on nectar composition and nectary metabolism.
- We investigated the influence of drought, different temperatures and light–dark regimes on nectar and nectaries of the epiphytic bromeliad species, Aechmea fasciata, and also the influence of drought with the terrestrial bromeliad, Billbergia nutans. The content of sugars, amino acids and ions in nectar and nectaries was analysed using HPLC. In addition, the starch content and the activities of different invertases in nectaries were determined.
- Compositions of nectar and nectaries were hardly influenced, neither by light nor dark, nor by different temperatures. In contrast, drought revealed changes in nectar volumes and nectar sugar compositions in the epiphytic bromeliad as well as in the terrestrial bromeliad. In both species, the sucrose‐to‐hexose ratio in nectar decreased considerably during the drought period. These changes in nectar sugar composition do not correlate with changes in the nectaries. The total sugar, amino acid and ion concentrations remained constant in nectar as well as in nectaries during the drought period.
- Changes in nectar composition or in the production of floral pollinator rewards are likely to affect plant–pollinator interactions. It remains questionable how far the adaptations of the bromeliads to drought and diverse light or temperature conditions are still sufficient.
中文翻译：
光，暗，温度和干旱对附生凤梨科植物（Aechmea fasciata）花蜜和蜜腺中代谢产物和离子组成的影响。
- 由于气候变化，研究干旱，不同温度和/或变化的光照条件等胁迫因素对植物的影响变得越来越重要。像凤梨科的许多物种一样，附生植物特别受此影响，但对花蜜成分和蜜腺代谢的影响知之甚少。
- 我们调查了干旱，不同温度和明暗制度对附生凤梨科植物Aechmea fasciata的花蜜和蜜腺的影响，以及陆地凤梨科植物Billbergia nutans对干旱的影响。用HPLC分析了花蜜和蜜腺中糖，氨基酸和离子的含量。另外，测定了蜜中淀粉含量和不同转化酶的活性。
- 花蜜和蜜腺的成分几乎不受光照，黑暗或不同温度的影响。相反，干旱揭示了附生凤梨科和陆地凤梨科的花蜜量和花蜜糖成分发生了变化。在干旱时期，这两个物种的花蜜中蔗糖与己糖之比均显着下降。花蜜糖成分的这些变化与蜜腺的变化不相关。在干旱期间，花蜜和蜜腺中的总糖，氨基酸和离子浓度保持恒定。
- 花蜜成分或花粉传粉者奖励的产生中的变化可能会影响植物与传粉媒介的相互作用。凤梨科植物对干旱和各种光照或温度条件的适应性仍足够远，这仍然值得怀疑。
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