Pollen source alone can make tangerines sweeter
Chen Y, Lin Z, Yu W.
Crop Improvement
If you grow citrus in a mixed orchard or even a backyard with a couple of different trees nearby, this is a reminder that what's blooming next door can quietly change the taste of your own fruit without you doing anything differently.
Scientists cross-pollinated 'Fuju' tangerine flowers with pollen from a different citrus variety called 'Murcott' and compared the resulting fruit to tangerines that pollinated themselves. The cross-pollinated fruit ended up sweeter, packing about 15% more sucrose, because the pollen somehow influenced which sugar-processing genes turned on inside the fruit as it ripened. It's a reminder that a fruit isn't just shaped by its own tree; the pollen that fertilized its flower leaves a fingerprint too.
Key Findings
Cross-pollination with Murcott tangor pollen increased sucrose content in Fuju fruit by about 15% compared to self-pollinated controls at harvest.
The sucrose increase appeared during late fruit development (210-230 days after flowering) and correlated with altered expression of sucrose synthase and neutral invertase genes.
Citric acid levels showed no significant difference between pollination treatments, indicating the xenia effect influenced sugar metabolism more than organic acid accumulation.
chevron_right Technical Summary
When a 'Fuju' tangerine tree is pollinated by a different citrus variety, the resulting fruit ends up sweeter, with about 15% more sucrose, even though the seed parent's genes still dominate the fruit itself.
Abstract Preview
Original paper
Xenia effect of 'Murcott' tangor pollen on sugar-acid metabolism and phenolic compounds in Fuju.
The sweetness of citrus fruits is primarily determined by the concentrations and ratios of sugars and organic acids. The xenia effect, defined as the influence of pollen genotype on fruit phenotype...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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The tangerine is a type of citrus fruit that is orange in colour, that is considered either a variety of the mandarin orange, or a closely related species, under the name Citrus tangerina, or yet as a hybrid of mandarin orange varieties, with some pomelo contribution.