Genetic Analysis of the Rice Cultivar Kasalath with Special Reference to Two Photoperiod Sensitivity Loci, E1 and Se-1

Ichitani, Katsuyuki; Okumoto, Yutaka; Tanisaka, Takatoshi

doi:10.1270/jsbbs1951.48.51

Cited by 19 publications

(27 citation statements)

References 21 publications

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“…Heading time was reported to be a quantitative character controlled by some major genes, related to regional adaptability (Ichitani et al 1998, Okumoto et al 1991, Sato et al 1994) and sterility (Doi et al 1998). Heading time is a highly heritable character and is quite specific to the variety.…”

Section: Discussionmentioning

confidence: 99%

Stability of Characters of a Doubled Haploid Rice Variety, Shirayukihime.

Sugimoto

Arai

2002

Breed. Sci.

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In order to determine whether anther-derived varieties and conventional varieties behave in the same manner as theoretically assumed, the stability of the characters in a doubled haploid variety Shirayukihime, developed by anther culture of rice (Oryza sativa L.), was evaluated compared with three varieties, Koshihikari, Nipponbare and Hatsushimo, developed by conventional methods of breeding. Days to heading, culm length, panicle length and panicle number of those varieties were measured or counted generation by generation for ten years. The days from the beginning to the end of heading were not different between the doubled haploid variety and the conventional varieties. The stability of culm length and panicle length was not different among the four varieties based on the non-significant difference in their coefficients of variation (CV). The CV in culm length was found to be highly stable, as no significance was detected for year-to-year and variety-to-variety. In the CV of panicle numbers, significant differences were detected in both years and varieties, between early and late plantings. However, no significant difference was detected between the doubled haploid variety and the conventional varieties in both plantings. Therefore, the CV in the characters of Shirayukihime were not higher than those of the other varieties. These results suggest that the stability of the characters of the doubled haploid variety might not be different from those of conventional varieties. The conventional method of breeding could thus be efficiently supplemented with the anther culture method.

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Section: Discussionmentioning

confidence: 99%

Stability of Characters of a Doubled Haploid Rice Variety, Shirayukihime.

Sugimoto

Arai

2002

Breed. Sci.

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“…The presence of Ef1 was conWrmed based on the DNA polymorphism, since Ehd1 was suggested to be the same as Ef1, as mentioned later. On the other hand, e1 has not yet been identiWed although it resides in a region near the Hd4 locus on chromosome 7 (Okumoto et al 1992;Ichitani et al 1998).…”

Section: Gene Identiwcationmentioning

confidence: 99%

“…In the absence of Se1, Ef1 shortens BVG, and e1 intensiWes the earliness due to Ef1. It was, however, found that e1 suppresses the eVect of Photoperiod sensitivity gene 1 (Se1 = Hd1), which encodes the rice homolog of Arabidopsis CO playing a signiWcant role in photoperiodic Xowering (Yano et al 2000;Yokoo et al 1980;Okumoto et al 1996b;Ichitani et al 1998). Therefore, to elucidate the developmental and genetic relationships among PS, BVG and OP with respect to Xowering, we aimed to investigate to what extent the three Xowering time genes contribute to the diVerent components responsible for Xoral initiation in rice.…”

Section: Introductionmentioning

confidence: 99%

Epistasis among the three major flowering time genes in rice: coordinate changes of photoperiod sensitivity, basic vegetative growth and optimum photoperiod

et al. 2007

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Flowering time is aVected not only by photoperiod sensitivity (PS) but also by basic vegetative growth (BVG) and optimum photoperiod (OP), although their developmental and genetic relationships are not well understood. The present study was carried out in rice to examine to what extent these three developmental components are modiWed by the three Xowering time genes, Se1 (= Hd1), Ef1 and e1 (= m-Ef1), which are known to contribute to Xowering time in temperate and tropical regions of rice cultivation. Photoperiodic response curves were estimated under controlled conditions of diVerent growth regimes, using eight near-isogenic lines possessing diVerent combinations of the alleles at the three loci. The results showed that each of the components is greatly aVected by the main eVect of the genes, temperature and their epistasis, indicating that none of the three genes controls Xowering time by altering any single component in PS, BVG or OP. Epistasis was detected more frequently among the three genes than reported before, suggesting that epistasis contributes to Xowering time by changing PS, BVG and OP diVerently. The comparison of the nucleotide sequences suggested that Ef1 is the same as Early heading date 1 (Ehd1). Since the two genes Se1 (= Hd1) and Ef1 (= Ehd1) are known to up-regulate the rice homolog of Arabidopsis FT, it is suggested that the detected epistasis may respond to diverse environments by modulating the CO/FT system conserved in Xowering plants.

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“…Under the genotype of a non-PS allele at QTL (chr7), Hd1 could not express strong PS (Nonoue et al 2008). Based on the chromosomal location, QTL (chr7) may correspond to E1, Hd4, and qHDT7-1 (Yano et al 1997, Ichitani et al 1998, Fujino and Sekiguchi 2005a. To express extremely early heading, a non-PS allele at E1/qDTH7-1 is essential (Okumoto et al 1996, Fujino andSekiguchi 2005a); therefore, the results of this study revealed that qDTH6-2 plays an important role in the variation of heading date among cultivars with extremely low PS.…”

Section: Relationships Between Our Qtls and Known Qtlsmentioning

confidence: 99%

Mapping of quantitative trait loci controlling heading date among rice cultivars in the northernmost region of Japan

Fujino

Sekiguchi

2008

Breed. Sci.

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Heading date is the major factor in the regional and seasonal adaptation of rice cultivars. Although many genes controlling heading date have been identified using several mapping populations, it is not clear which previously identified genes contribute to the variation of heading date in particular regions. However, great effort is needed to identify quantitative trait loci (QTLs) among rice cultivars in rice breeding programs in a particular region because they are genetically closely related. In this study, we identified QTLs controlling heading date in 3 F 2 populations among rice cultivars in Hokkaido, the northernmost region of Japan. The segregations of heading date were continuous in all populations. For QTL analysis in populations with genetically close relationships, we used SSR markers located near the known QTLs for the heading date. Three QTLs for the heading date, qDTH3, qDTH-6-1, and qDTH6-2, were detected on chromosomes 3 and 6. The relationships between the three QTLs identified in this study and the known QTLs are discussed.

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Genetic Analysis of the Rice Cultivar Kasalath with Special Reference to Two Photoperiod Sensitivity Loci, E1 and Se-1

Cited by 19 publications

References 21 publications

Stability of Characters of a Doubled Haploid Rice Variety, Shirayukihime.

Stability of Characters of a Doubled Haploid Rice Variety, Shirayukihime.

Epistasis among the three major flowering time genes in rice: coordinate changes of photoperiod sensitivity, basic vegetative growth and optimum photoperiod

Mapping of quantitative trait loci controlling heading date among rice cultivars in the northernmost region of Japan

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