サツマイモ新品種「こなみずき」の育成

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タイトル別名
  • Konamizuki : A New Sweetpotato Cultivar
  • サツマイモ シン ヒンシュ 「 コ ナミ ズキ 」 ノ イクセイ

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Konamizuki is a newly released cultivar for starch production, developed at the National Agricultural Research Center for Kyushu Okinawa Region. It was evaluated at prefectural agricultural experimental stations as breeding line "Kyushu No. 159" and was submitted for variety registration in 2010. Konamizuki is the progeny from a cross between 99L04-3 and Kyukei 236 conducted at the Sweetpotato Breeding Laboratory in 2003. 99L04-3 has a low starch pasting temperature and Kyukei 236 has a high starch content and high yield. Two hundred seventy two seeds were sown in the nursery. Selection was based on field performance, starch content and starch pasting temperature. Konamizuki exhibits slightly better sprouting ability and is a slightly prostrate plant with light green top leaves. The mature leaves are green and cordate. The vine diameter is intermediate with a somewhat short internode length. Pigmentation of anthocyanin is absent in the veins and the vine nodes. The storage root is long and fusiform with white skin and flesh. The yielding ability of Konamizuki is comparable to that of Siroyutaka, a leading Japanese variety for starch production. The dry matter content and starch content of Konamizuki are comparable to those of Siroyutaka, and its starch yield is comparable to that of Siroyutaka. Starch granules from Konamizuki exhibit an abnormal morphology characterized by cracking into granules. The starch pasting temperature of Konamizuki is approximately 20℃ lower than that of Siroyutaka as determined by Rapid Visco Analyzer. The peak viscosity of Konamizuki is similar to that of Siroyutaka. The starch retrogradation, evaluated by leaked water percentage and hardness of starch gels after cold storage, indicates that Konamizuki starch retrogrades much more slowly than Siroyutaka starch and has excellent cold storage stability. The raw starch of Konamizuki has higher digestibility than dose Siroyutaka. Konamizuki is somewhat resistant to black rot (Ceratocystis fimbriata), somewhat resistant to root lesion nematode (Pratylenchus coffeae), and resistant to root knot nematode (Meloidogyne incognita). The storage ability of the storage roots is sufficient throughout winter.

でん粉原料用サツマイモ新品種「こなみずき」は, 既存のでん粉原料用品種「シロユタカ」にはない, 低温糊化性, 耐老化性および高分解性といった新規特性を有するでん粉を含む。標準無マルチ栽培では「シロユタカ」並みのでん粉収量を示し, センチュウおよび黒斑病抵抗性に優れる。

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