• 제목/요약/키워드: Rice cultivars

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The Ratooning Potential of Several Early-Ripening Rice Cultivar in Korea (조생종 벼의 움벼(ratoon-rice)생산 및 움벼의 생육특성)

  • Shin, Jong-Hee;Kim, Sang-Kuk;Park, Sang-Gu
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.60 no.2
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    • pp.139-145
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    • 2015

  • Rice ratooning is the production of a second rice crop from the stubble left behind after the main-crop harvest. The main advantage of rice ratooning is that in areas where rice is the main crop, double crop of rice can be grown for additional returns. Eight cultivars of rice were tested for estimation their ratooning ability. The main crop was harvested at mass maturity, after which the tillers were mowed to stubbles of about 10 cm tall. And then left without any further input, until the ratooned plant were ready for harvest. Highly significant variations were detected in the ratoon performance among cultivars, with ratoon ability ranging from 0% ('Unkwang', 'Jopeyong', 'Odae', 'Nokyang') to 33% ('Jinbuol') in their grain yield. The maximum grain yield from ratoon rice was 202 and 203 kg/10a for 'Jinbuol' and 'Joun' followed by 'Junamjoseng' 174kg/10a. Protein and amylose contents of ratoon rice were more increased than those of main rice. The platability value of cooked rice of ratoon was lower than that of main crop. Germination rate of the previous year's harvest of rice was not significantly different between ratoon and main crop. This rice ratooning system requires short duration, creating possibility for growing another crop in the same cropping year and offers an opportunity to increase cropping intensity per unit of cultivated areas.

  • https://doi.org/10.7740/kjcs.2015.60.2.139 인용 PDF KSCI

Investigation of brassinosteroid substances in the shoots of japonica type Korean rice (일반계 벼의 brassinosteroid활성물질 검색)

  • Hyun, Kyu-Hawn;Park, Keun-Hyung
    • Applied Biological Chemistry
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    • v.33 no.4
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    • pp.307-314
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    • 1990

  • Brassinosteroid-like substances in two japonica type Korean rices were investigated. The extracts from the shoots at the maximum tillering stage were purified by solvent fractionation, silica gel adsorption chromatography, Sephadex LH-20 chromatography, charcoal adsorption chromatography, preparative TLC, Bondesil chromatography and HPLC of normal phase and reverse phase, successively. Biological activity of each purification step were monitored by the rice lamina inclination test. Two cultivars tested in this experiment produced brassinosteroids and endogenous brassinosteroids showing similiarity between two cultivars.

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Salinity Tolerance of Progenies between Korean Cultivars and IRRI's New Plant Type Lines in Rice

  • Lee, Seung-Yeob;Dharmawansa Senadhira
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.43 no.4
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    • pp.234-238
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    • 1998

  • To select new germplasm for salinity tolerance from new plant type (NPT) breeding lines, the sixty F$_4$ lines selected from the crosses between Korean cultivars and IRRI's NPT lines were evaluated for salinity tolerance at the seedling stage with salinized culture solution (EC=12 dS/m) in the controlled conditions. Two NTP lines derived from a cross between 'Ilmibyeo' and 'IR66152-AC5-1', 'HR15258-7-1' and 'HR15258-27-1', were found to have good tolerance. The salinity tolerance of the lines was compared to their parents and the sensitive ('IR29') and tolerant ('Pokkali') checks in three salinity levels, no salinity (control) and an EC of 12 and 16 dS/m. Visual salinity score, shoot Na+ and Na-K ratio in two NPT lines was significantly low compared with the parents and IR29. Indicating that salinity tolerance of the lines might be derived from a transgressive segregation. The relative water content of the lines was higher than Pokkali, and the dry weight of shoot and root was proportionally decreased to salinity score and salinizing concentration. The visual salinity scores were significantly correlated with shoot Na concentration, Na-K ratio, relative water content, and reduction of dry weight (P<0.01). Their tolerance was attributed to root and shoot characteristics that led to high shoot water content, thus diluting the toxic effect of salts.

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