Varietal Difference and Temperature Response of Local Soil-Reduction around Germinating Rice Seed.

Hagiwara, Motoyuki; Imura, Mitsuo

doi:10.1626/jcs.62.105

Cited by 11 publications

(5 citation statements)

References 6 publications

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“…The cultivars Maratelli and Nuovo Maratelli also showed relative high growth rates when germinated at 15°C (on average 0.38 ± 0.14 mm/d), but results were irregular in Maratelli seeds. In the opposite side, the Portuguese cultivar Arroz da Terra, which has also been reported to be cold tolerant at germination [ 30 ], did not show in our experiments a superior response. Although 86% of seeds from this cultivar germinated at 15°C, we determined a coleoptile mean growth rate of 0.26 ± 0.03 mm/d.…”

Section: Discussioncontrasting

confidence: 59%

“…Among the japonica gene pool, the European varieties Arroz da Terra and Italica Livorno have been employed as cold tolerant parents in breeding programs [ 30 , 31 ], and some advanced populations derived from these crosses have been used to map QTLs related to LTG [ 24 ]. The favourable qLTG3-1 allele of Italica Livorno detected in the chromosome 3 [ 19 ] has been cloned [ 32 ] and also detected in the cultivar Maratelli, which possesses other positive allele for LTG in chromosome 11, qLTG11-1 [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

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Genome wide association analysis of cold tolerance at germination in temperate japonica rice (Oryza sativa L.) varieties

et al. 2017

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A pool of 200 traditional, landraces and modern elite and old cultivars of rice, mainly japonica varieties adapted to temperate regions, have been used to perform a genome wide association study to detect chromosome regions associated to low temperature germination (LTG) regulation using a panel of 1672 SNP markers. Phenotyping was performed by determining growth rates when seeds were germinated at 25° and 15°C in order to separate the germination vigorousness from cold tolerance effects. As expected, the ability to produce viable seedlings varied widely among rice cultivars and also depended greatly on temperature. Furthermore, we observed a differential response during seed germination and in coleoptile elongation. Faster development at 15°C was observed in seeds from varieties traditionally used as cold tolerant parents by breeders, along with other potentially useful cultivars, mainly of Italian origin. When phenotypic data were combined with the panel of SNPs for japonica rice cultivars, significant associations were detected for 31 markers: 7 were related to growth rate at 25°C and 24 to growth rates at 15°. Among the latter, some chromosome regions were associated to LTG while others were related to coleoptile elongation. Individual effects of the associated markers were low, but by combining favourable alleles in a linear regression model we estimated that 27 loci significantly explained the observed phenotypic variation. From these, a core panel of 13 markers was selected and, furthermore, two wide regions of chromosomes 3 and 6 were consistently associated to rice LTG. Varieties with higher numbers of favourable alleles for the panels of associated markers significantly correlated with increased phenotypic values at both temperatures, thus corroborating the utility of the tagged markers for marker assisted selection (MAS) when breeding japonica rice for LTG.

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Section: Discussioncontrasting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Genome wide association analysis of cold tolerance at germination in temperate japonica rice (Oryza sativa L.) varieties

et al. 2017

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“…About 550,000 ha, corresponding to about 35 % of the area used for rice cultivation in Japan, are devoted to Koshihikari, almost all of which is transplanted. Direct seeding cultivation of Koshihikari would save labor and cultivation costs, but unfortunately Koshihikari is not suitable for direct seeding (Hagiwara and Imura 1993). Although the present results are consistent with this assessment, the genetic traits related to the reduction tolerance rate and the recovery rate of Koshihikari can be improved by crossing it with Todoroki-wase and Toyonishiki as well as by crossing it with Kameno-o, Norin 22 and Fujisaka 5.…”

Section: Resultssupporting

confidence: 74%

Varietal Variations in Rice Seedling Growth under Low Oxidation-Reduction Potentials.

2002

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In direct seeding of rice (Oryza sativa L.), rice seedlings are exposed to low oxidation-reduction (redox) potential soil, and to low temperatures in cold areas. In order to trace the genealogy of tolerance to low redox potential among Japanese rice cultivars, we selected 12 Japanese rice cultivars that had been released over the past century and determined the ability of their seedlings to tolerate immersion in low redox culture solution of Eh = −150 to −180 mv. Seedlings with coleoptiles and radicles of about 1 to 2 cm were incubated in low redox potential culture solution for 2 days at 18 and 30°C, and then in distilled water for 3 days at the same temperatures to examine the recovery abilities. The lengths of shoots and roots were measured after pre-germination, after low redox treatment, and after recovery from damage that occurred in the de-oxidized solution. At 30°C, the tolerance of low redox potentials was positively and significantly correlated with recovery from damage that occurred in the de-oxidized solution. The high tolerance of recent cultivars to these low redox potentials at 30°C appeared to originate from Fujisaka 5. However, at 18°C, the differences among the cultivars in their tolerance of low redox potentials and in their ability to recovery became small.

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“…This study focused on enhancing the early growth of rice seedlings in direct seeding cultivation in cold regions, including the Tohoku district in Japan, using various PGRs. The physiologically critical temperature for germination and early seedling growth is approximately 17ºC (Nishiyama, 1978;Maruyama and Tajima, 1986;Hagiwara and Imura, 1993). Early seedling growth, including seedling establishment is one of the most crucial agronomic issues in direct seeding rice cultivation.…”

Section: Discussionmentioning

confidence: 99%

Effects of the Combined Application of Ethephon and Gibberellin on Growth of Rice (Oryza sativaL.) Seedlings

Watanabe

Hase

Saigusa

2007

Plant Production Science

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Varietal Difference and Temperature Response of Local Soil-Reduction around Germinating Rice Seed.

Cited by 11 publications

References 6 publications

Genome wide association analysis of cold tolerance at germination in temperate japonica rice (Oryza sativa L.) varieties

Genome wide association analysis of cold tolerance at germination in temperate japonica rice (Oryza sativa L.) varieties

Varietal Variations in Rice Seedling Growth under Low Oxidation-Reduction Potentials.

Effects of the Combined Application of Ethephon and Gibberellin on Growth of Rice (Oryza sativaL.) Seedlings

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