Mangroves adaptive plasticity in the changing environmental conditions is of vital importance for conservation management. Genetic diversity of mangrove brings about adaptive plasticity, enabling a species to cope with different habitat conditions. The Sundarbans of Bangladesh is the largest coastal wetland and mangrove forest with diversified habitat conditions that support a wide diversity of flora and fauna. Avicennia officinalis L. is the pioneer species in mangrove succession in the low-salinity, medium-salinity and high-salinity zones of the Sundarbans. Adopting RAPD-PCR analysis, the genetic diversity of A. officinalis was studied to explore the ecotypes of this species in the Sundarbans. The genetic distances of A. officinalis between the low-salinity and medium-salinity zones (0.50) and between the low-salinity and high-salinity zones (0.52) are significantly (p < 0.05) higher than that between the medium-salinity and high-salinity zones (0.09). The expected heterozygosity of A. officinalis of medium-salinity (0.54 ± 0.14) and high-salinity zones (0.55 ± 0.10) are higher than that of low-salinity zone (0.37 ± 0.12). The genetic diversity of A. officinalis of medium-salinity (0.5417 ± 0.3167) and high-salinity (0.5458 ± 0.3189) zones is significantly (p < 0.05) higher than that of low-salinity zone (0.3750 ± 0.2313). This genetic diversity of A. officinalis bears significant ecological consequences. A. officinalis growing in the low-salinity zone is the low salt-adapted ecotype while that growing in the medium-salinity and high-salinity zones is the high salt-adapted ecotype in the Sundarbans. These two ecotypes of A. officinalis are of both in-situ and ex-situ conservation importance for the Sundarbans and coastal plantations of Bangladesh to face the climate change induced salinity regime changes in the future.

中文翻译：

---

孟加拉国Sundarbans红树林中盐度梯度上的Avicennia officinalis L.遗传多样性的解释

红树林在不断变化的环境条件下的适应性可塑性对于保护管理至关重要。红树林的遗传多样性带来了适应性可塑性，使一个物种能够应对不同的生境条件。孟加拉国的Sundarbans是最大的沿海湿地和红树林，栖息地条件多样化，可支持多种动植物。Avicennia officinalis L.是Sundarbans低盐度，中盐度和高盐度地区红树林演替的先驱物种。采用RAPD-PCR分析，遗传多样性A.厚朴进行了研究，探讨该物种在孙德尔本斯的生态型。厚朴的遗传距离低盐度和中度盐度区之间（0.50）和低盐度和高盐度区之间（0.52）显着（p <0.05）高于中盐度和高盐度区（0.09） 。中等盐度（0.54±0.14）和高盐度区（0.55±0.10）的A. officinalis的预期杂合度高于低盐度区（0.37±0.12）。的遗传多样性A.巴戟中等盐度（0.5417±0.3167）和高盐度的（0.5458±0.3189）区是显著比低盐度区（0.3750±0.2313）的升高（P <0.05）。A. officinalis的这种遗传多样性具有重大的生态后果。厚朴在低盐度地区生长的是低盐适应的生态型，而在中盐度和高盐度地区生长的是高盐适应的生态型。这两个生态型的A.巴戟都在原地和迁地保护重要性，孙德尔本斯和孟加拉国的沿海种植园在未来面临的气候变化引起的盐度政权更迭的。