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Vol.1 , No. 5, Publication Date: Nov. 22, 2014, Page: 107-114
 showed that NERICA18 had the highest coleoptile length at 14 °c followed by NERICA1 and NERICA7. Mean of radical length revealed NERICA7 had the highest followed by NERICA1. Strong correlation under 14 °c (r = 0.78) observed between coleoptile and radicle length but no obvious correlation (r = 0.32 and r =0.28) between them under 19 and 25 °c, respectively. Correlation between radiccle and coleoptile length were proved that a greater coleoptile length reduction was accompanied by a greater reduction in radicle length and germination index due to cold temperature stress. Strong correlation (r = 0.77) was found between radicle length and germination index under 14 °c, but weak correlation (r = 0.38 and r = 0.21) under 19 and 25 °c, respectively. Genotypes, NERICA7 and NERICA1 combined both high mean coleoptile and rdicle length and could be characterized as ideal genotypes. These probably possess genetic tolerance to low temperature stress and might be exploited as a source of cold tolerant genotype for rice breeding programs.&picture=http://www.aascit.org/aascit/decorators/img/journal/923.jpg)
| [1] | Abebaw Dessie, Ethiopian Institute of Agricultural Research, National Rice Research and Training Center, Woreta, Ethiopia. |
| [2] | Irie Kenji, Tokyo University of Agriculture, 1-1-1, Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan. |
| [3] | Hironobu Shiwachi, Tokyo University of Agriculture, 1-1-1, Sakuragaoka, Setagaya-ku, Tokyo 156-8502, Japan. |
The study was conducted with the objective to examine the potential of radicle and coleoptile lengths of twenty-two upland rice under three temperature conditions containing 14, 19 and 25 °c for 30, 20 and 7 days, respectively. The experiment was laid out in randomized completely block design with two replications in Laboratory of Tokyo University of Agriculture. ANOVA result in each level of temperature revealed significant effects for radicle length; coleoptile length at 14 and 25 °c, whereas no significant difference observed at 19 °c. Mean comparison (LSD) showed that NERICA18 had the highest coleoptile length at 14 °c followed by NERICA1 and NERICA7. Mean of radical length revealed NERICA7 had the highest followed by NERICA1. Strong correlation under 14 °c (r = 0.78) observed between coleoptile and radicle length but no obvious correlation (r = 0.32 and r =0.28) between them under 19 and 25 °c, respectively. Correlation between radiccle and coleoptile length were proved that a greater coleoptile length reduction was accompanied by a greater reduction in radicle length and germination index due to cold temperature stress. Strong correlation (r = 0.77) was found between radicle length and germination index under 14 °c, but weak correlation (r = 0.38 and r = 0.21) under 19 and 25 °c, respectively. Genotypes, NERICA7 and NERICA1 combined both high mean coleoptile and rdicle length and could be characterized as ideal genotypes. These probably possess genetic tolerance to low temperature stress and might be exploited as a source of cold tolerant genotype for rice breeding programs.
Keywords
NERICA, Rice, Low Temperature, Radicle Length, Coleoptile Length, Germination Index, Correlation
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