Adaptation activity
In the lettuce producing region of Nagano Prefecture, a new variety "Naga-no-50" has been developed, which is resistant to root rot (wilting and death) that is prone to occur with plants that are frequently harvested, and is less susceptible to ‘tip burn’ (browning of the edges of leaves (Fig. 1)) which has become more frequent, due to climate change.
Naga-no-50 is resistant to two types of lettuce root rot pathogens that occur in Nagano Prefecture, and has a low incidence of chip burn even though it is grown for shipment in mid-summer (July to mid-August) when temperatures are higher (Fig. 2). Thus, development of a lettuce variety like Naga-no-50 is intended for farms that harvest in mid-summer in areas at altitudes of 1,000 meters or higher, to improve the quality of the mid-summer crop, and to stabilize production.
