Seki Kousuke, Hiraga Masahiro, Soga Eri, Matsui Kenji
Nagano Vegetable and Ornamental Crops Experiment Station, 1066-1 Tokoo, Souga, Shiojiri, Nagano 399-6461, Japan.
Nagano Fruit Tree Experiment Station, 492 Ogawara, Suzaka, Nagano 382-0072, Japan.
Breed Sci. 2024 Sep;74(4):388-392. doi: 10.1270/jsbbs.24016. Epub 2024 Aug 27.
'Hisui no Kaori' is the first lettuce ( L.) cultivar characterized by a sweet fragrance, attributed to 2-acetyl-1-pyrroline with the same compound as in fragrant rice and soybean cultivars, as well as edible leaves and stem. Field cultivation trials established optimal planting distances at 30 cm between seedlings, with a fertilizer requirement of N = 150 kg/ha. 'Hisui no Kaori' exhibited minimal stem burst as well as resistance to soft rot disease, proving easier to cultivate compared with prominent stem-type cultivars. Field cultivation tests at different altitudes and incubator tests revealed that an air temperature exceeding 20°C is pivotal for the development of the sweet fragrance. 'Hisui no Kaori' displayed moderately resistance to Fusarium wilt race 1 and highly resistance to race 2. In lettuce, discoloration is known to occur at the cut surface due to mechanical wounding. In a cut leaf test, 'Hisui no Kaori' was classified as having delayed discoloration. Overall, 'Hisui no Kaori' is expected to contribute to the expanding potential and the increasing market price of lettuce. This work represents a pioneering effort to open up the fragrant type of lettuce.
“翡翠之香”是首个具有甜香气味的生菜（L.）品种，其甜香归因于2-乙酰基-1-吡咯啉，该化合物与香米和大豆品种中的相同，其叶片和茎均可食用。田间栽培试验确定了最佳种植间距为株距30厘米，氮肥需求量为150千克/公顷。“翡翠之香”茎部开裂极少，且对软腐病具有抗性，与突出的茎型品种相比，更易于栽培。不同海拔的田间栽培试验和培养箱试验表明，气温超过20°C对甜香气味的形成至关重要。“翡翠之香”对尖孢镰刀菌1号生理小种表现出中度抗性，对2号生理小种表现出高度抗性。在生菜中，已知由于机械损伤，切割面会出现变色。在切叶试验中，“翡翠之香”被归类为变色延迟。总体而言，“翡翠之香”有望为生菜不断扩大的潜力和不断上涨的市场价格做出贡献。这项工作是开拓香型生菜的开创性努力。
