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    World’s largest plant is a vast seagrass meadow in Australia

    WASHINGTON (AP) – Scientists have discovered the world’s largest plant off the Australia coast – a seagrass meadow that has grown by repeatedly cloning itself.

    Genetic analysis has revealed that the underwater fields of waving green seagrass are a single organism covering 180 square kilometres through making copies of itself over 4,500 years.

    The research was published last Wednesday in Proceedings of the Royal Society B.

    Scientists confirmed that the meadow was a single organism by sampling and comparing the DNA of seagrass shoots across the bed, wrote study co-author and marine biologist at the University of Western Australia Jane Edgeloe.

    A variety of plants and some animals can reproduce asexually. There are disadvantages to being clones of a single organism – such as increased susceptibility to diseases – but “the process can create ‘hopeful monsters’” by enabling rapid growth, the researchers wrote. The scientists call the meadow of Poseidon’s ribbon weed “the most widespread known clone on Earth,” covering an area larger than Washington.

    Though the seagrass meadow is immense, it’s vulnerable. A decade ago, the seagrass covered an additional seven square miles, but cyclones and rising ocean temperatures linked to climate change have recently killed almost a 10th of the ancient seagrass bed.

    This August 2019 photo provided by The University of Western Australia shows part of the Posidonia australis seagrass meadow in Australia’s Shark Bay. PHOTO: AP
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