カンキツ新品種‘津之輝’

1．‘津之輝’は1984 年に果樹試験場口之津支場において，KyOw No. 14（‘清見’ב興津早生’）に‘アンコール’を交雑して育成された品種である．2001 年よりカンキツ第9 回果樹系統適応性・特性検定試験に系統名カンキツ口之津34 号として供試した．その結果，2008年3 月にみかん農林17 号‘津之輝’と命名，登録された．また，2009 年3 月19 日付けで，種苗法に基づき第17970 号として品種登録された．2．樹勢は中程度，樹姿は直立性と開張性の中間である．枝梢は長さ，太さともに中位で密生する．隔年結果性は中程度である．そうか病には強く，かいよう病には中程度の抵抗性がある．カンキツトリステザウイルス（CTV）に強く，ステムピッティングの発生程度は軽である．3．果実は180 g 程度で，扁球形である．果皮は濃橙色で，果面の粗滑は中位である．果皮の厚さは平均2.7 mmで薄い．剥皮性は中である．果肉は濃橙色で，じょうのう膜はやわらかく，肉質は柔軟多汁である．果汁の糖度は13％程度と高く，酸度は1 月下旬には1 g/100 mL前後になる．成熟期は1 月下旬～ 2 月上旬である．含核数は平均で2 粒程度であるが， 無核果の割合も高い．果肉に含まれる総カロテノイド含量は3 年平均値で4.62 mg/100 gFW，β - クリプトキサンチン含量は2.18 mg/100 gFW とウンシュウミカン‘興津早生’よりも高い傾向にあった．4．成熟期が1 月下旬と厳冬期にあたるため- 4°C を下回らない地域に適していると考えられる．また，少加温施設栽培にすることで200 g 以上の大果で糖度が13％以上の高品質果実が年内出荷可能になる．5．若齢樹では，特に施設栽培で果頂部に突起「へそ果」が発生しやすいため摘果時に落とす必要がある．また，夏季の高温期に土壌が過乾燥することで果皮表面に葉における葉肉崩壊症のような褐変症状が発生することがあるため灌水等により土壌の過乾燥を防ぐ必要がある．‘Tsunokagayaki’ is a new mid-ripening citrus (Citrus sp.) cultivar released by the National Agriculture and Food Research Organization (NARO), Institute of Fruit Tree Science (NIFTS). It originated from a cross between KyOw No. 14 [‘Kiyomi’ (C. unshiu × C. sinensis) × ‘Okitsu-Wase’ (C. unshiu)] and ‘Encore’ (C. nobilis × C. deliciosa) that was performed in 1984 at the Kuchinotsu Branch, Fruit Tree Research Station, Nagasaki, Japan. It was initially selected in 1989, when it was designated Kankitsu Kuchinotsu No. 34. In 2001, it was included in the 9th citrus selection national trial, which was conducted at 28 experimental stations in Japan. It was ultimately selected in July 2006 and authorized under the name Mikan Norin No.17 ‘Tsunokagayaki’ in March 2008, and subsequently registered as a new cultivar (No. 17970) under the Plant Variety Protection and Seed Act of Japan on 19 March 2009.The tree has medium vigor, and its shape is intermediate between upright and spreading. The fruit weighs about 180 g and has an oblate shape. The rind is dark orange with an average thickness of 2.7 mm, and has moderately easy peelability. The fruit surface is intermediate between smooth and rough. The fruit ripens in late January at Minamishimabara, Nagasaki, Japan. The soluble solids content (Brix) in juice is high (about 13%) and the acidity decreases to about 1 g/100 mL in the ripe fruit. The flesh is soft and juicy, with distinctive flavor. The β-cryptoxanthin content in the flesh is high (an average of 2.18 mg/100 g fresh weight [FW]). The fruit sometimes contains a few seeds. High-quality fruits that ripen 1 to 2 months earlier could be produced in greenhouse under energy-saving cultivation, with a weight of more than 200 g and a Brix of about 13%

カンキツ新品種‘津之望’

1．‘津之望’は1974 年に果樹試験場口之津支場において，‘清見’に‘アンコール’を交雑して育成された早生カンキツの新品種である．2001 年よりカンキツ第9回果樹系統適応性・特性検定試験に系統名カンキツ口之津37 号として供試した．その結果，新品種候補としてふさわしいとの合意が得られ，品種登録出願を行い，2011 年5 月24 日付けで，種苗法に基づき第20788 号として品種登録された．また，2012 年3 月にはみかん農林18 号に農林認定品種として認定された．2．樹勢は中程度，樹姿は直立性と開張性の中間である．枝梢は長くて太く，密生する．隔年結果性は‘べにばえ’や‘アンコール’より低い．浮き皮はほとんど発生せず，裂果は‘べにばえ’や‘アンコール’よりも少ない．そうか病にはウンシュウミカンよりも強い傾向があり，かいよう病にはネーブルオレンジと同程度に弱い．CTVに強く，ステムピッティングの発生はほとんどない．3．各地における試作結果から，果実は180 g 程度で，扁球形である．果皮は橙色で，果面の粗滑は中である．果皮の厚さは平均2.4 mm で薄い．剥皮性は中で浮き皮はほとんど発生しない．果肉は濃橙色で，じょうのう膜はやや軟らかく，肉質はやや軟らかく多汁である．果汁の糖度は12％程度でやや高く，酸度は0.84 g/100 ml 程度である．成熟期は育成地で12 月下旬である．含核数は6 粒程度である．果肉に含まれる総カロテノイド含量は3 年平均値で3.76 mg/100 gFW とウンシュウミカン‘興津早生’よりも有意に高く，β - クリプトキサンチン含量は1.82 mg/100 gFW とウンシュウミカン‘興津早生’と同程度含まれる．4．成熟期は露地栽培で概ね12 月下旬で年内収穫可能なことから栽培可能な地域は広いと考えられる．栽培上の留意点として不完全種子が多いものの，種子形成力が強く，自身の花粉も健全なことから，無核果生産は難しいが，できるだけナツミカンなどの花粉を多く生産する品種の近くを避けて植栽することが望ましい．また，着果性がよく着果過多になりやすいため摘果を適切に行い，樹勢の維持・強化に努める必要がある．‘Tsunonozomi’ is a new early-ripening citrus (Citrus sp.) cultivar released by the National Agriculture and Food Research Organization (NARO), Institute of Fruit Tree Science (NIFTS). It originated from a cross between ‘Kiyomi’ (C. unshiu × C. sinensis) and ‘Encore’ (C. nobilis × C. deliciosa) that was performed in 1974 at the Kuchinotsu Branch, Fruit Tree Research Station, Nagasaki, Japan. It was initially selected in 1985. From 2001, when it was designated Kankitsu Kuchinotsu No.37, it was included in the 9th citrus selection national trial, which was conducted at 31 experimental stations in Japan. It was ultimately selected in August 2009 and authorized under the name Mikan Norin No.18 ‘Tsunonozomi’ in March 2012, and subsequently registered as a new cultivar (No.20788) under the Plant Variety Protection and Seed Act of Japan on 24 May, 2011. The tree has medium vigor with a shape intermediate between upright and spreading. Its degree of alternate bearing is lower than those of ‘Benibae’ and ‘Encore’. There is no fruit puffing. Its resistance to citrus scab caused by Elsinoë fawcettii is higher than that of satsuma mandarin, but its resistance to citrus canker caused by Xanthomonas citri pv. citri is low, similar to that of navel orange. Stem pitting due to citrus tristeza virus is minor. The oblate fruit weighs about 180 g. The rind is orange, 2.4 mm thick on average, and has medium peelability. The fruit surface texture is medium. The fruit ripens in late December in open field cultivation at Minamishimabara, Nagasaki. The soluble solids content (Brix) of juice is moderately high (about 12%), and the acidity decreases to <1.0 g/100 ml in the ripe fruit. The flesh is moderately soft and juicy with a distinctive flavor like that of ‘Encore’. The β-cryptoxanthin content in the flesh is as high (1.82 mg/100 g fresh weight [FW]) as that of satsuma mandarin. The fruit contains a moderate number of seeds

Observation results by the TAMA300 detector on gravitational wave bursts from stellar-core collapses

We present data-analysis schemes and results of observations with the TAMA300 gravitational-wave detector, targeting burst signals from stellar-core collapse events. In analyses for burst gravitational waves, the detection and fake-reduction schemes are different from well-investigated ones for a chirp-wave analysis, because precise waveform templates are not available. We used an excess-power filter for the extraction of gravitational-wave candidates, and developed two methods for the reduction of fake events caused by non-stationary noises of the detector. These analysis schemes were applied to real data from the TAMA300 interferometric gravitational wave detector. As a result, fake events were reduced by a factor of about 1000 in the best cases. The resultant event candidates were interpreted from an astronomical viewpoint. We set an upper limit of 2.2x10^3 events/sec on the burst gravitational-wave event rate in our Galaxy with a confidence level of 90%. This work sets a milestone and prospects on the search for burst gravitational waves, by establishing an analysis scheme for the observation data from an interferometric gravitational wave detector

Measurements of Cosmic-ray Low-energy Antiproton and Proton Spectra in a Transient Period of the Solar Field Reversal

The energy spectra of cosmic-ray low-energy antiprotons and protons have been measured by BESS in 1999 and 2000, during a period covering the solar magnetic field reversal. Based on these measurements, a sudden increase of the antiproton to proton flux ratio following the solar magnetic field reversal was observed, and it generally agrees with a drift model of the solar modulation.Comment: 4 pages, 4 figures, revised version accepted for publication in Phys. Rev. Let