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首页> 外文期刊>Gulf and Caribbean research >DETERMINING SALINITY-TOLERANCE OF GIANT SALVINIAUSING CHLOROPHYLL FLUORESCENCE
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DETERMINING SALINITY-TOLERANCE OF GIANT SALVINIAUSING CHLOROPHYLL FLUORESCENCE

机译：测定巨型硫代叶绿素荧光的耐盐性

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Salvinia molesta Mitchell, a floating invasive aquatic plant, is one of the top 10 worst invasive aquatic weedsin the world. It was discovered in the lower Pascagoula River in 2005 and evidence suggests that this non-native speciesis spreading along the northern Gulf of Mexico. These plants exhibit rapid growth and nutrient uptake rates, allowingthem to out compete other plants in similar habitats. Distributional observations suggest that non-native S. molesta is ableto survive in salinities of up to 7 ppt in the lower Pascagoula River. The response of S. molesta to three salinity levels (0,5, 10 ppt) was tested using chlorophyll fluorescence. The health of the plants was measured over a period of one month,using a log scale series of observation intensities (hourly, daily, weekly). Plant responses indicated an acute salinity effectafter about 4-6 hrs and then a gradual chronic decline. Compared to initial measurements, the final actual quantum yield(AF/Fm') dropped by 5%, 6% and 29%, while the final potential quantum yield (Fv/Fm) dropped 6%, 27% and 39% inthe 0, 5, and 10 ppt treatments, respectively. Only plants in the 0 ppt treatment showed significant new growth. Plants in5 ppt appeared to maintain themselves, but plants at 10 ppt all exhibited signs of severe stress and loss of color, turgor,and tissue viability after 10 d. Tolerance to brackish salinities has been reported in the past, and has implications for theuse of the biological control agent, the weevil Cyrtobagous salviniae, that can only tolerate freshwater conditions.
机译：Salvinia molesta Mitchell是一种漂浮的入侵性水生植物，是世界上十大最严重的入侵性水生杂草之一。它于2005年在帕斯卡古拉河下游被发现，证据表明这种非本地物种正沿着墨西哥湾北部扩散。这些植物表现出快速的生长和养分吸收率，使其能够与其他类似栖息地的植物竞争。分布的观察结果表明，帕斯卡古拉河下游的非天然链球菌能够在盐度高达7 ppt的条件下生存。使用叶绿素荧光测试了葡萄球菌对三种盐度水平（0.5、10 ppt）的响应。使用对数刻度系列的观察强度（每小时，每天，每周）在一个月的时间内测量植物的健康状况。植物反应表明约4-6小时后有急性盐度作用，然后逐渐慢性下降。与初始测量相比，最终的实际量子产率（AF / Fm'）分别降低了5％，6％和29％，而最终的潜在量子产率（Fv / Fm）则在0年代分别降低了6％，27％和39％。 5和10 ppt处理。只有0 ppt处理的植物显示出明显的新生长。 5 ppt的植物似乎可以自我维持，但是10 ppt的植物在10 d后都表现出严重的胁迫迹象，并且失去颜色，膨胀和组织活力。过去已经报道了对微咸盐度的耐受性，并且其对只能容忍淡水条件的生物控制剂象鼻虫Cyrtobagous salviniae产生了影响。

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