A groundbreaking study identifies a protein, WEEP, whose absence in weeping trees like the Weeping Peach Tree causes shoots to grow downwards due to altered auxin distribution. The discovery could revolutionize orchard management by enabling closer planting of fruit trees, potentially enhancing productivity and optimizing space.
A basic premise of how plants grow is that shoots grow up and roots grow down. A new study, published in, a leading international society journal published by the American Society of Plant Biologists, reveals the answer to a fascinating question: why do weeping tree varieties defy this natural growth pattern?deletion in just one gene completely changes the localization of the hormone auxin, which then leads to shoots intentionally growing downwards, like roots.
“It brings a new piece to the puzzle of how auxin gradients can be created,” noted Dr. Courtney Hollender, corresponding author of the study. “We were excited and surprised to find something new involving a gene that is in all plants, but was not picked up from Arabidopsis research.”Compared to standard peach branches, the weeping peach branches have a flipped auxin distribution at their shoot tips.
“By identifying mechanisms associated with how trees predetermine and regulate branch orientation, I am hoping to develop new breeding strategies and cultural practices that would enable fruit trees to easily and affordably be grown close together and in narrow rows to generate fruiting walls”, said Hollender, who is studying weeping peach trees as part of an effort to optimize orchard management and tree fruit production.
Reference: “Defying Gravity: WEEP promotes negative gravitropism in peach trees by establishing asymmetric auxin gradients” by Andrea R Kohler, Andrew Scheil, Joseph L Hill, Jeffrey R Allen, Jameel M Al-Haddad, Charity Z Goeckeritz, Lucia C Strader, Frank W Telewski and Courtney A Hollender, 15 February 2024,SciTechDaily: Home of the best science and technology news since 1998. Keep up with the latest scitech news via email or social media.
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