Varietal variations in basic vegetative phase and photosensitive phase among Japanese native cultivars of rice.

Sato, Yoichiro; Hayashi, Kisaburo

doi:10.1270/jsbbs1951.35.72

Cited by 3 publications

(2 citation statements)

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“…Heading time of rice is an important agronomic trait for the seasonal and regional adaptability of cultivars (Chang et al 1969, Sato andHayashi 1985). Growth period from sowing to heading consists of the vegetative growth phase and reproductive phase.…”

Section: Introductionmentioning

confidence: 99%

Linkage Analysis of a Lateness Gene ef4 in Rice, Oryza sativa L.

et al. 2005

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A near isogenic line T65-LH2 bred from IR8 by five times of successive backcrossing with Taichung 65 (T65) as recurrent parent was found to harbor a lateness gene ef4(t). In the present study, we investigated the allelic relationship between ef4(t) and two earliness genes, Efx and Ef1, followed by linkage analysis to reveal the chromosomal location of ef4(t). T65-LH2 was crossed with two testers, T65-ER21 and T65-ER1 harboring the earliness genes, Efx and Ef1, respectively. F 1 plants of the two crosses were raised to obtain F 2 seeds. Moreover, the F 1 plants were backcrossed with T65-LH2 as to obtain the B 1 F 1 seeds. Heading time in F 2 and B 1 F 1 plants as well as parental lines were examined. F 2 and B 1 F 1 plants of the crosses between T65-LH2 and T65-ER21 showed monogenic segregation while F 2 and B 1 F 1 plants obtained from the cross between T65-LH2 and T65-ER1 exhibited digenic segregation. Thus, ef4(t) is allelic to Efx on chromosome 3 and independent of Ef1. Subsequently, linkage analysis of ef4(t) was carried out using three marker genes on chromosome 3, Hg, dl and bc1. T65-LH2 was crossed with the isogenic lines of T65 carrying those marker genes. Heading time and morphological characters in F 2 plants and parental lines were observed. Results showed that ef4(t) was linked to Hg and dl with recombination values estimated at 33.2% and 16.8%, respectively, but segregated independently of bc1.

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Section: Introductionmentioning

confidence: 99%

Linkage Analysis of a Lateness Gene ef4 in Rice, Oryza sativa L.

et al. 2005

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“…Heading time of rice is an important agronomic trait which is responsible for seasonal and regional adaptability of cultivars (Chang et al 1969, Sato andHayashi 1985). Growing period from sowing to heading consists of the vegetative growth phase and reproductive phase.…”

Section: Introductionmentioning

confidence: 99%

Location of New Gene for Late Heading in Rice, Oryza sativa L. Using Interchange Homozygotes

et al. 2004

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A near isogenic line T65-LH1 was developed from an upland rice variety R300 (Thailand) through eight successive backcrossing with Thaichung 65 (T65) as a recurrent parent. Previously unpublished study indicated T65-LH1 may harbor a recessive lateness gene which was likely located on the sixth chromosome. The present study was aimed at further identifying the lateness gene of this newly bred line by linkage study and allelism test. Linkage study was conducted using seven kinds of interchange homozygotes involved with the sixth chromosome. Individual interchange homozygous lines were crossed with T65-LH1, then, each F 1 population was backcrossed to T65-LH1. Segregations for heading times in all B 1 F 1 populations showed early and late types fitted to the 1 : 1 expected ratio, suggesting that T65-LH1 carried a recessive lateness gene. Chi-square values for independence between the present gene and four breakpoints, 2-6, 6-7b, 6-7c and 6-10 were insignificant. However, those to three breakpoints, 4-6, 6-7 and 6-8 were significant at 1 % level and the respective recombination values were estimated as 3.2 %, 4.3 % and 3.4 %. This suggested the gene under study was located on the sixth chromosome. Subsequently, allelism test between the present gene and other three lateness genes, ef2(t), ef3(t) and ef4(t) was carried out. Crosses of T65-LH1 and three testers having each of those lateness genes were made. Segregations for heading times in F 2 populations of those crosses fitted to the 9 : 3 : 3 : 1, 12 : 3 : 1 and 9 : 3 : 3 : 1 expected ratios. It suggested the present gene was independent from the lateness genes, ef2(t), ef3(t) and ef4(t). In conclusion, the lateness gene harbored by T65-LH1 was a new gene and designated as ef5. It was carried by the sixth chromosome.

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