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应用介绍
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中新网北京8月5日电 (记者 孙自法)植物真的能“吃肉”吗?中国科学家领衔在青藏高原发现一种开花植物——灯架虎耳草,被研究确认为一个新的食虫植物谱系,以确凿证据实证存在食肉植物类型,也证实进化论奠基人达尔文150多年前提出的植物物种可能具有食肉性的预测。

这项植物谱系研究的重要突破性进展,由中国科学院昆明植物研究所孙航院士团队联合中国科学院武汉植物园、吉首大学、美国佛罗里达大学等中外合作者共同完成,其研究结果表明,灯架虎耳草能够吸引、捕获并消化昆虫,并从中吸收氮元素。北京时间8月4日夜间,相关论文在国际学术期刊上线发表。
论文共同通讯作者、中国科学院昆明植物研究所邓涛研究员介绍说,在当今自然界,虽然许多植物都表现出捕食等食肉特征,但要被正式归类为食肉植物,它们必须具备吸引、捕获、消化猎物以及从猎物中吸收营养的适应性特征。1875年,达尔文曾推测,作为一类通常生长在高山环境中的被子植物,虎耳草属的某些物种可能具有食肉性,因为它们拥有能够捕获昆虫的粘性腺毛。然而,此前一直缺乏确凿证据来支持这一假说。

在本项研究中,研究团队对生长在中国青藏高原-横断山脉高山地区的灯架虎耳草进行全面深入研究,实地观察和现有植物样本的调查显示,在45个被调查的标本中,有43个的腺毛上附着有昆虫猎物,成熟植株平均共捕获71只昆虫(主要附着在这些腺毛上)。
随后,研究团队开展寻找灯架虎耳草消化和营养吸收昆虫的证据,他们通过荧光标记法检测到了磷酸酶活性(一种常见于食虫植物的消化酶),这表明该植物可能具有消化猎物的能力。
接下来,研究团队将标记有稳定氮同位素的果蝇喂给灯架虎耳草,以分析该植物能否从猎物中吸收营养。他们观察到,灯架虎耳草及另一种食虫植物的对照植株中,标记氮的水平显著上升,这与非食虫对照组形成鲜明对比,从而支持了灯架虎耳草物种具有食虫行为的假说。
最后,进一步通过基因分析发现,灯架虎耳草基因组与其他独立演化的食虫植物存在相似性,包括与诱捕猎物、消化及营养吸收相关的基因。

研究团队总结认为,灯架虎耳草这一系列研究发现,为达尔文150多年前提出的假说提供了有力证据,即某些虎耳草属物种的确具有食肉性。(完)
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