KNOX is a trait in lettuce varieties which delays
the discolouration process of leaves caused by
oxidation. This presents numerous benefits,
especially for processors and retailers. But the
biggest winner is probably the end user; for the
consumer, pre-packed bags of salad now stay
fresher for longer.
Fresh-cut bagged lettuce has gained considerable ground in recent years.
However, the pinking on the edges poses a tricky problem. In response to this, the breeders at Rijk Zwaan – who are continually working on innovations and improvements to existing products – set out in search of a nature-based solution. They developed a research methodology and tested the extent of discolouration in hundreds of lettuce heads. And then they had a breakthrough: the researchers found a plant with no discolouration even after three days. Extensive laboratory and practical tests have confirmed this unique trait.
Crossing into varieties
It appeared to be a recessive trait and breeders set to work to investigate its inheritance pattern. Once techniques such as genetic markers had provided certainty, it was time for the next step and the breeders initiated backcrossing into various lettuce types as quickly as possible. Finally, after a decade of continuous research and development, the breeders presented six varieties with the KNOX gene: cos, batavia, iceberg lettuce, butterhead, Salanova® Crispy and Salanova® Butter.
KNOX was officially launched onto the market in September 2015 during the Rijk Zwaan Leafy Event, and the KNOX varieties were on display at the demo field in Fijnaart immediately afterwards. Visitors were very interested in the concept. All the enquiries from growers and processing companies are currently being evaluated so that widespread trials can start in 2016. The assortment of varieties will gradually be extended
over the coming years to eventually make a KNOX version available for every favourite.
“KNOX extends shelf life of lettuce by two days”
According to Bauke van Lenteren, Convenience Manager at Rijk Zwaan, KNOX responds to an important need among processors. “Thanks to KNOX, fresh-cut lettuce does not always need low-oxygen packaging. This reduces costs and gives processors more options when blending. Furthermore, it eliminates the unpleasant smell that is associated with opening low-oxygen packaging.”
''Combining the benefits for the processing industry with the advantages for retailers – better inventory management and less waste – reveals the true scope of KNOX: a more sustainable chain in which this groundbreaking innovation will hopefully stimulate consumers to purchase and hence eat lettuce more frequently. “After all, the KNOX benefits ultimately create a better consumer experience too.”
For more information, please visit www.rijkzwaan.com.