Short-term responses to salinity of an invasive cordgrass

被引:40
作者
Castillo, JM
Rubio-Casal, AE
Redondo, S
Alvarez-López, AA
Luque, T
Luque, C
Nieva, FJ
Castellanos, EM [1 ]
Figueroa, ME
机构
[1] Univ Huelva, Dept Ciencias Agroforestales, Huelva, Spain
[2] Univ Sevilla, Dept Biol Vegetal & Ecol, Seville, Spain
关键词
chlorophyll fluorescence; gas exchange; Gulf of Cadiz; leaf expansion; salt marsh; South American neophyte; Spartina densiflora; water potential;
D O I
10.1007/s10530-004-9626-9
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Salinity is one of the main chemical factors in salt marshes. Studies focused on the analysis of salinity tolerance of salt marsh plants are very important, since they may help to relate their physiological tolerances with distribution limits in the field. Spartina densiflora is a South America cordgrass, which has started its invasion of the European coastline from the southwestern Iberian Peninsula. In this work, short-term responses in adult tussocks of S. densiflora from southwestern Spain are studied over a wide range of salinity in a greenhouse experiment. Our results point out that S. densiflora has a high tolerance to salinity, showing high growth and net photosynthesis rates from 0.5 to 20 ppt. S. dens flora showed at the lowest salinity (0.5 ppt) high levels of photoinhibition, compensated by higher levels of energy transmission between photosystems. Adaptative mechanisms, as those described previously, would allow it to live in fresh water environments. At the highest salinity (40 ppt), S. densiflora showed a high stress level, reflected in significant decreases in growth, net photosynthesis rate and photochemical efficiency of Photosystem II. These responses support S. dens flora invasion patterns in European estuaries, with low expansion rates along the coastline and faster colonization of brackish marshes and river banks.
引用
收藏
页码:29 / 35
页数:7
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