Mapping of QTLs for Vascular Bundle System and Spike Morphology in Rice, Oryza satva L.

Sasahara, Hideki; Fukuta, Yoshimichi; Fukuyama, Toshinori

doi:10.1270/jsbbs.49.75

Cited by 36 publications

(32 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 E6). Sasahara et al (1999) reported that the QTL for the number of primary rachis branches and major vascular bundles in a peduncle was located on chromosome 6 for the RILs that were derived from the cross Asominori (japonica)/IR24 (indica). Although they did not report the number of spikelets or the ripening percentage, the location of the QTL was close to that observed in our experiment for the number of primary rachis branches, both in the RILs and BCILs.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Trait Loci for Sink Size and Ripening Traits in Rice (Oryza sativa L.).

et al. 2002

View full text Add to dashboard Cite

Quantitative trait loci (QTLs) that affect sink size and ripening, which are often negatively correlated, were analyzed in two inbred lines of rice (Oryza sativa L.) derived from crosses between the semi-dwarf indica and japonica cultivars. Recombinant inbred lines (RILs) from Milyang23 (indica)/Akihikari (japonica), and back-crossed inbred lines (BCILs) from Sasanishiki (japonica)/Habataki(indica)//Sasanishiki///Sasanishiki were studied over a period of two years. A major QTL that was related to the number of spikelets per panicle was found in the same region of chromosome 1 in both populations. The indica allele increased the number of spikelets and reduced the ripening percentage. The indica allele of the QTL, which was found in both populations but at different locations on chromosome 6, also increased the number of spikelets per panicle, although to a lesser extent than in the case of the QTL on chromosome 1. In this instance, the number of spikelets per panicle did not have a negative effect on the ripening percentage. The increased number of spikelets produced by the QTL on chromosome 6 was due mainly to an increase in the number of primary rachis branches. In contrast, the effect of the QTL on chromosome 1 relied on an increase in the number of secondary rachis branches. In addition, dry matter production tended to increase when the QTL region of chromosome 6 belonged to the indica genotype. Therefore, both panicle structure and source productivity might contribute to the increase of the sink size without reducing the ripening percentage. We also found two loci on chromosomes 11 and 12 of the RILs that were associated with the percentage of incompletely filled spikelets, but which did not affect the sink size. It is considered that these QTLs could contribute significantly to the breeding of cultivars with increased sink size and increased ripening.

show abstract

Section: Discussionmentioning

confidence: 99%

Quantitative Trait Loci for Sink Size and Ripening Traits in Rice (Oryza sativa L.).

et al. 2002

View full text Add to dashboard Cite

show abstract

“…It plays an important role in high yield and better grain filling in rice through the efficient transport of water and nutrients from the leaves and stems (Cui et al, 2003). The diameter of the panicle neck is strongly correlated with the total sink capacity and grain weight, which are affected by the conductive tissue together with the source strength (Sasahara et al, 1999;Liu et al, 2008). Panicle neck length, known as 'panicle exsertion' (PE), is also considered to be essential for enhancing total sink capacity and grain filling by improving the transport efficiency of assimilates (Ma et al, 2002;da Cruz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Analysis of QTLs for panicle exsertion and its relationship with yield and yield-related traits in rice (Oryza sativa L.)

Zhao¹,

Chen²,

QingYong³

et al. 2016

Genet. Mol. Res.

View full text Add to dashboard Cite

ABSTRACT. Panicle exsertion (PE) is an important morphological trait that is closely associated with spikelet fertility and grain yield. To understand the genetic basis of PE and its relationships with yield and yield-related traits, a recombinant inbred population consisting of 240 lines derived from a cross between an Indica cultivar 'Kasalath' and a Japonica germplasm 'TD70', was studied over two years. PE was significantly correlated with plant height, heading date (HD), panicle length (PL), and panicle characteristics such as primary branch number, spikelet number per panicle, and spikelet density, but showed poor correlation with yield components. Based on linkage mapping of 141 SSR markers, a total of 38 quantitative trait loci (QTLs) were located for 12 investigated traits, with the contribution varying from 6.51 to 8.61%. Among these, four QTL clusters were identified on chromosomes 1, 2, 3, and 6, suggesting the existence of pleiotropic alleles. In some intervals, two loci for PE were collocated with several traits, which is consistent with the correlations observed with phenotypic variations. The PE QTLs with 'Kasalath' alleles and without pleiotropic effects would be valuable for the improvement of PE in 'TD70' and in other rice varieties.

show abstract

“…Yagi et al (2001) and Nagata et al (2002) also detected QTLs with strong effects (LOD scores of more than 8.0) on the number of spikelets per panicle and the number of SBs at almost the same position as region 3 in another mapping population derived from the cross of a japonica-cultivar Akihikari and an indica-cultivar Milyang 23. Sasahara et al (1999) mapped several QTLs controlling the number of PBs in the same mapping population as that used in the present study by interval mapping. Six of their QTLs (qNRB-2-1, qNRB-4-2, qNRB-8-1, qNRB-8-2, qNRB-8-3 and qNRB-8-4; Sasahara et al 1999) out of eight appeared to be equivalent to the genome regions identified in the present study, in terms of their positions and additive effects.…”

Section: Discussionmentioning

confidence: 99%

“…Sasahara et al (1999) mapped several QTLs controlling the number of PBs in the same mapping population as that used in the present study by interval mapping. Six of their QTLs (qNRB-2-1, qNRB-4-2, qNRB-8-1, qNRB-8-2, qNRB-8-3 and qNRB-8-4; Sasahara et al 1999) out of eight appeared to be equivalent to the genome regions identified in the present study, in terms of their positions and additive effects. qNRB-2-1, qNRB-4-2 and qNRB-8-1 were present in the regions 7, 23 and 34, respectively.…”

Section: Discussionmentioning

confidence: 99%

Quantitative Trait Loci Controlling the Number of Spikelets and Component Traits in Rice: Their Main Effects and Interaction with Years

Kato

2004

Breed. Sci.

View full text Add to dashboard Cite

To develop superior rice panicles with a sufficient sink capacity and a high degree of grain filling, we should consider the within-panicle distribution of spikelets showing different degrees of grain filling, as well as the total spikelet number. In the present study, several component traits of the number of spikelets per panicle which are related to the within-panicle distribution, and also the number of panicles per plant, were examined using 68 recombinant inbred lines (RILs) derived from a cross of Asominori/IR24 grown over a period of four years, 1997, 1998, 2000 and 2001. For every trait related to the spikelet number per plant, analyses of variance (ANOVA) were conducted at the 375 position of molecular markers one by one to detect significant main effects of quantitative trait loci (QTLs) and interactions of marker genotype and year of cultivation (QY interactions). Then, genetic associations of these traits were analyzed by examining the positions of the relevant genome regions which showed significant main effects and/or interactions for different traits. Finally, the QTLs causing favorable genetic effects and associations for the development of superior panicles were surveyed. The results showed that most of the genome region identified to increase the spikelet number per panicle also increased the number of spikelets on the secondary branches which are characterized by a low degree of grain filling. One region on chromosome 3, on the other hand, increased the spikelet number per panicle through the increase of the number of spikelets on primary branches which generally show a high degree of grain filling. Significant QY interactions were demonstrated in many genome regions for all traits, whereas the interactions of RIL and year could not be detected in an overall ANOVA in which the marker genotypes of RILs were not being considered. The region on chromosome 3, cited above, did not exhibit a significant QY interaction. This region appears to involve QTL(s) suitable for the development of superior panicle types.

show abstract

Mapping of QTLs for Vascular Bundle System and Spike Morphology in Rice, Oryza satva L.

Cited by 36 publications

References 20 publications

Quantitative Trait Loci for Sink Size and Ripening Traits in Rice (Oryza sativa L.).

Quantitative Trait Loci for Sink Size and Ripening Traits in Rice (Oryza sativa L.).

Analysis of QTLs for panicle exsertion and its relationship with yield and yield-related traits in rice (Oryza sativa L.)

Quantitative Trait Loci Controlling the Number of Spikelets and Component Traits in Rice: Their Main Effects and Interaction with Years

Contact Info

Product

Resources

About