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Orchid seed sensitivity to nitrate reflects habitat preferences and soil nitrate content.
Plant Biology ( IF 4.2 ) Pub Date : 2019-10-09 , DOI: 10.1111/plb.13044 T Figura 1, 2 , M Weiser 3 , J Ponert 1, 4
Plant Biology ( IF 4.2 ) Pub Date : 2019-10-09 , DOI: 10.1111/plb.13044 T Figura 1, 2 , M Weiser 3 , J Ponert 1, 4
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Orchids are distributed around the world, however, the factors shaping their specific distribution and habitat preferences are largely unknown. Moreover, many orchids are at risk of becoming threatened as landscapes change, sometimes declining without apparent reason. One important factor affecting plant distribution is nutrient levels in the environment. Nitrates can inhibit not only orchid growth and persistence, but also seed germination. We used in vitro axenic cultures to exactly determine the germination sensitivity of seven orchid species to nitrates and correlated this with soil properties of the natural sites and with the species' habitat preferences. We found high variation in response to nitrate between species. Orchids from oligotrophic habitats were highly sensitive, while orchids from more eutrophic habitats were almost insensitive. Sensitivity to nitrate was also associated with soil parameters that indicated a higher nitrification rate. Our results indicate that nitrate can affect orchid distribution via direct inhibition of seed germination. Nitrate levels in soils are increasing rapidly due to intensification of agricultural processes and concurrent soil pollution, and we propose this increase could cause a decline in some orchid species.
中文翻译：
兰花种子对硝酸盐的敏感性反映了栖息地的喜好和土壤硝酸盐的含量。
兰花分布在世界各地，但是，影响其特定分布和栖息地偏好的因素在很大程度上尚不清楚。此外，随着景观的变化，许多兰花有受到威胁的风险，有时会在没有明显原因的情况下下降。影响植物分布的一个重要因素是环境中的营养水平。硝酸盐不仅可以抑制兰花的生长和持久性，而且可以抑制种子发芽。我们使用体外树胶培养物来准确确定7种兰花物种对硝酸盐的萌发敏感性，并将其与自然场所的土壤特性以及该物种的栖息地偏好相关联。我们发现物种之间对硝酸盐的反应差异很大。来自贫营养生境的兰花非常敏感，而来自富营养化栖息地的兰花几乎不敏感。对硝酸盐的敏感性也与表明较高硝化率的土壤参数有关。我们的结果表明硝酸盐可以通过直接抑制种子发芽来影响兰花的分布。由于农业生产过程的加强和土壤污染的共同作用，土壤中的硝酸盐含量正在迅速增加，我们认为这种增加可能会导致某些兰花种类的减少。
更新日期：2019-10-09
中文翻译：
兰花种子对硝酸盐的敏感性反映了栖息地的喜好和土壤硝酸盐的含量。
兰花分布在世界各地，但是，影响其特定分布和栖息地偏好的因素在很大程度上尚不清楚。此外，随着景观的变化，许多兰花有受到威胁的风险，有时会在没有明显原因的情况下下降。影响植物分布的一个重要因素是环境中的营养水平。硝酸盐不仅可以抑制兰花的生长和持久性，而且可以抑制种子发芽。我们使用体外树胶培养物来准确确定7种兰花物种对硝酸盐的萌发敏感性，并将其与自然场所的土壤特性以及该物种的栖息地偏好相关联。我们发现物种之间对硝酸盐的反应差异很大。来自贫营养生境的兰花非常敏感，而来自富营养化栖息地的兰花几乎不敏感。对硝酸盐的敏感性也与表明较高硝化率的土壤参数有关。我们的结果表明硝酸盐可以通过直接抑制种子发芽来影响兰花的分布。由于农业生产过程的加强和土壤污染的共同作用，土壤中的硝酸盐含量正在迅速增加，我们认为这种增加可能会导致某些兰花种类的减少。
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