The right pollen donor turns a self-incompatible citrus into a reliable fruiter
Liu Y, Qiu H, Xu W, Zhou X, Ou Z
Crop Improvement
Growers of specialty citrus struggling with heavy fruit drop now have a named pollen donor that more than quintuples fruit retention, a result any orchardist can put into practice next flowering season.
A Chinese citrus called Luchuan Juhong is prized for both medicine and food, but it rarely sets fruit on its own because it rejects its own pollen. Scientists tested pollen from four different pomelo varieties and found that 'Jinju' pomelo works exceptionally well as a partner, keeping over 40% of fruits on the tree versus just 8% with self-pollination. Inside the flower, 'Jinju' pollen tubes race to the egg faster, hormone levels shift in ways that signal 'keep this fruit,' and hundreds of proteins ramp up to build stronger fruit-stem connections.
Key Findings
'Jinju' pomelo pollen achieved 41.56% fruit retention at 8 weeks, versus 8.00% for self-pollination and 24.22% for the commonly used 'Hongrou' pomelo.
'Jinju' pollen germinated in 6.67 hours at an 89.68% rate, with pollen tubes confirmed reaching the ovary base before stigma senescence.
Cross-pollination triggered a surge in growth hormones IAA and zeatin alongside a sharp drop in the fruit-drop signal ABA at 5-7 days, accompanied by upregulation of 386 proteins including key lignin-pathway enzymes PAL, 4CL, and CAD.
chevron_right Technical Summary
Researchers found that using pollen from 'Jinju' pomelo dramatically improves fruit set in a prized but notoriously self-incompatible Chinese citrus variety, raising fruit retention from 8% to over 41% by eight weeks. The improvement is driven by faster pollen tube growth, favorable hormone shifts, and activation of structural proteins in the developing fruit.
Abstract Preview
Original paper
'Jinju' Pomelo pollen enhances fruit set and development in Citrus maxima 'Tomentosa': physiological and proteomic associations.
Citrus maxima (Burm.) Merr. 'Tomentosa' ('Luchuan Juhong') is a valuable medicinal and edible germplasm, yet its commercial cultivation is severely constrained by strong self-incompatibility, which...
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The pomelo, also known as a shaddock, is the largest citrus fruit. It is an ancestor of several cultivated citrus species, including the bitter orange and the grapefruit. It is a natural, non-hybrid citrus fruit, native to Southeast Asia. Similar in taste to a sweet grapefruit, the pomelo is comm...