Wild Australian macadamias hold genetic keys to future nut industry

Wild macadamia trees, native to a small patch of Australian rainforest, hold a genetic treasure trove vital for the future of the $2 billion global nut industry. These ancient trees, some of which have evolved for over 120 million years, possess resilience to climate change and diseases that commercial varieties lack.

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It is the world’s finest nut. It is an Australian icon and our only native plant that has become a commercial food.

Ian McConachie, a lifelong advocate for the macadamia, has dedicated decades to preserving these wild species. He highlights that while commercial macadamias have only been cultivated for a few generations, their wild ancestors may harbor untold potential. "It is the world's finest nut," McConachie stated, emphasizing its status as an Australian icon and its sole native commercial food plant.

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They [the trees] like expensive real estate, which makes them incredibly endangered because we’ve got so little rainforest left.

However, these valuable trees face severe threats. Their preferred habitat, a small subtropical rainforest in southeast Queensland and northern New South Wales, is also prime real estate, leading to extensive habitat loss. "They [the trees] like expensive real estate, which makes them incredibly endangered because we’ve got so little rainforest left," explained Denise Bond, executive director of Wild Macadamia Conservation.

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Which is pretty much where everyone wants to live.

One species, Macadamia jansenii, is critically endangered, with a single bushfire capable of wiping it out. Its location is kept secret for protection. While its nuts are too bitter to eat, its hardiness could be a significant asset in combating climate change. Other species are listed as threatened or vulnerable, underscoring the urgent need for conservation efforts to safeguard this unique genetic resource for future generations.

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So we simply don’t know what the potential of the wild macadamia tree is.