Salinity responses of three halophytes from inland saltmarshes of Jaen (southern Spain)
Salinity responses of three halophytes from inland saltmarshes of Jaen (southern Spain)
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DOI：
10.1016/j.flora.2020.151589
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发表时间：
2020-05-01
期刊：
影响因子：
1.9
通讯作者：
del Pilar Cordovilla, Maria
中科院分区：
文献类型：
--
作者：
Bueno, Milagros;Lucia Lendinez, Maria;del Pilar Cordovilla, Maria
西班牙南部哈恩省3个盐沼的土壤分析表明，Don Benito盐沼为Sodic Solonchack型，Barranco Hondo盐沼和Brujuelo盐沼为Sodic Calcixerepts型。从这些盐沼中提取的3种盐生植物（Frankenia pululenta， Atriplex prostrata和Plantago coronopus）在水培条件下接受了长时间（21 d）和逐渐（0、100、200和300mM NaCl）的盐度胁迫。通过测定其鲜质量、干质量、根冠比、叶片含水量、离子含量、脯氨酸、总酚类物质和多胺（腐胺、亚精胺、精胺和尸胺）等指标来研究其对盐胁迫的响应。在NaCl浓度为100 ~ 200mM的条件下，粉嫩草生物量和叶片含水量最大，而在NaCl浓度为100mM的条件下，冠棘草生物量和叶片含水量均随着盐浓度和盐暴露时间的增加而降低。在有盐排泄机制的植物（粉棘菊和扁棘菊）叶片中，Na+和Cl-的积累随着盐的增加而增加，同时K+的减少，而冠状棘菊在有盐和无盐的情况下都有较高的离子水平。在渗透调节方面，脯氨酸含量在粉状棘球蛾和扁棘球蛾中起重要作用，而冠状棘球蛾的渗透性随着盐的增加而降低，而酚类和多胺含量则增加。（精胺+精胺）：腐胺比值最高的品种耐盐性越强。这些结果似乎表明了对盐度的各种适应反应。脯氨酸、酚类和多胺含量的增加与生长状况的改善有关，这可能导致这些物种在盐沼中不同程度的耐受性和分布。
Soil analyses of three saltmarshes in Jaen province (southern Spain) indicated Sodic Solonchack type for Don Benito saltmarsh, and Sodic Calcixerepts for Barranco Hondo and Brujuelo saltmarshes. Three halophytes (Frankenia pulverulenta, Atriplex prostrata, and Plantago coronopus) from these saltmarshes were submitted to long (21 days) and gradual (0, 100, 200, and 300mM NaCl) salinity stress, under hydroponic culture. The results of fresh mass, dry mass, root:shoot ratio, leaf water content, ion content, proline, total phenols, and polyamines (putrescine, spermidine, spermine and cadaverine) were examined to investigate the species' responses to saline stress. Maximum biomass production and leaf water content was found between 100 and 200mM NaCl in F. pulverulenta and at 100mM NaCl in A. prostrata, while a decrease of these parameters was registered in P. coronopus as the salt concentration and salt-exposure time increased. In leaves, Na+ and Cl- accumulation increased with salt concomitant with a reduction of K+ in plants with salt excretion mechanisms (F. pulverulenta and A. prostrata), while high levels of ions were found with and without salt in P. coronopus. For osmotic adjustment, proline content proved important in F. pulverulenta and A. prostrata, while in P. coronopus this osmolyte decreased with salt, while phenols and polyamines increased in all three species. The highest levels in (Spermidine+ Spermine): Putrescine ratio was related to the more salt-tolerant species. These results appear to indicate various adaptation responses to salinity. Rising levels of proline, phenols, and polyamines were related to better growth, which could contribute to different degree of tolerance and distribution of these species in saltmarshes.