Dissection of two quantitative trait loci for grain weight linked in repulsion on the long arm of chromosome 1 of rice (Oryza sativa L.)

Guo, Liang; Wang, Kai; Chen, Junyu; Huang, Detian; Fan, Ye‐Yang; Zhuang, Jie-Yun

doi:10.1016/j.cj.2013.07.008

Cited by 11 publications

(13 citation statements)

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“…The two BC 2 F 6 populations were previously found to be segregated in the intervals RM11448–RM11615 and RM11448–RM11787, and meanwhile to be ZS97 homozygous in the subsequent regions extended to RM11982, respectively (Guo et al 2013a ). An additional region towards the terminal end of the long arm of chromosome 1 was determined in the present study, extending from RM12026 that is 696 kb apart from RM11982, to RM12285 having a distance of 106 kb from the terminal end.…”

Section: Resultsmentioning

confidence: 99%

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Fine mapping of qHd1, a minor heading date QTL with pleiotropism for yield traits in rice (Oryza sativa L.)

Chen

Guo

et al. 2014

Theor Appl Genet

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Key messageA minor QTL for heading date located on the long arm of rice chromosome 1 was delimitated to a 95.0-kb region using near isogenic lines with sequential segregating regions.AbstractHeading date and grain yield are two key factors determining the commercial potential of a rice variety. In this study, rice populations with sequential segregating regions were developed and used for mapping a minor QTL for heading date, qHd1. A total of 18 populations in six advanced generations through BC2F6 to BC2F11 were derived from a single BC2F3 plant of the indica rice cross Zhenshan 97 (ZS97)///ZS97//ZS97/Milyang 46. The QTL was delimitated to a 95.0-kb region flanked by RM12102 and RM12108 in the terminal region of the long arm of chromosome 1. Results also showed that qHd1 was not involved in the photoperiodic response, having an additive effect ranging from 2.4 d to 2.9 d observed in near isogenic lines grown in the paddy field and under the controlled conditions of either short day or long day. The QTL had pleiotropic effects on yield traits, with the ZS97 allele delaying heading and increasing the number of spikelets per panicle, the number of grains per panicle and grain yield per plant. The candidate region contains ten annotated genes including two genes with functional information related to the control of heading date. These results lay a foundation for the cloning of qHd1. In addition, this kind of minor QTLs could be of great significance in rice breeding for allowing minor adjustment of heading date and yield traits.Electronic supplementary materialThe online version of this article (doi:10.1007/s00122-014-2395-7) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

“…In a previous study (Guo et al 2013a ), three sets of populations were derived from a single BC 2 F 3 plant of ZS97 3 /MY46. Among them, two BC 2 F 6 populations were selected as the starting materials for the present study.…”

Section: Methodsmentioning

confidence: 99%

Fine mapping of qHd1, a minor heading date QTL with pleiotropism for yield traits in rice (Oryza sativa L.)

Chen

Guo

et al. 2014

Theor Appl Genet

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“…In the original mapping of qTGW1.1 [ 17 ], RM11448 − RM1231 was the region showing segregation for this QTL in the BC 2 F 6 and BC 2 F 7 populations of ZS97 3 /MY46. Thus, a BC 2 F 8 plant carrying a heterozygous segment extending from RM11448 to RM1231 was selected.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous studies, detection of minor QTLs for this trait was conducted using segregating populations derived from the indica rice cross Zhenshan 97 (ZS97)///ZS97//ZS97/Milyang46 (MY46). Four minor QTLs, designated as qTGW1.1 , qTGW1.2a , qTGW1.2b , and qTGW1.2c , were resolved in a 12-Mb interval on the long arm of chromosome 1 [ 17 – 19 ]. These QTLs showed no significant effects on heading date and were consistently detected in different environments and populations.…”

Section: Introductionmentioning

confidence: 99%

Dissection of the qTGW1.1 region into two tightly-linked minor QTLs having stable effects for grain weight in rice

et al. 2016

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BackgroundMost agronomical traits of crop species are complex traits controlled by multiple genes and affected by environmental factors. While considerable efforts have been made to fine-map and clone major quantitative trait loci (QTLs) for yield-related traits in rice, it is not until recently that the attention has been paid to minor QTLs. Following previous dissection of QTLs for grain weight and grain size in a 12-Mb interval on the long arm of chromosome 1 in rice, this study targeted at one putative QTL region for a more precise mapping and for analyzing the genotype-by-environment interaction of minor QTLs.ResultsFour BC2F10 plants of the indica rice cross ZS97///ZS97//ZS97/MY46 were selected. They carried overlapped heterozygous segments that jointly covered the entire putative region for qTGW1.1 detected previously. Four sets of near isogenic lines (NILs) were developed from selfing progenies of the four plants. Each NIL set consisted of 32 ZS97 homozygous lines and 32 MY46 homozygous lines that differed in the corresponding heterozygous region. They were grown in two locations having distinct ecological conditions and measured for 1000-grain weight, grain length and grain width. Two QTLs were separated in an 835.2-kb interval flanked by DNA markers Wn28447 and RM11569. They both showed consistent effects across the two environments. The qTGW1.1a located within the 120.4-kb interval Wn28447 − RM11543 significantly affect all the three traits with the enhancing allele derived from ZS97, showing a stronger influence on grain weight than on grain length and width. The qTGW1.1b located in the 521.8-kb interval RM11554 − RM11569 significantly affect grain weight and length with the enhancing allele derived from MY46, having a stronger influence on grain length than on grain weight. Consistent performance of the two QTLs was confirmed in a validation experiment using five NIL-F2 populations segregated for either qTGW1.1a or qTGW1.1b.ConclusionSeparation of closely-linked QTLs having small effects is achievable in the absence of major-QTL segregation. Minor QTLs for complex traits could act consistently in diverse environments, offering the potential of pyramiding beneficial alleles of multiple minor QTLs through marker-assisted selection.Electronic supplementary materialThe online version of this article (doi:10.1186/s12863-016-0410-5) contains supplementary material, which is available to authorized users.

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“…Total plant dry weight was determined on plant material dried at 80°C for 72 h in a forced-air oven. Root moisture content and shoot moisture content were determined using the ratio of root water mass to root dry weight and the ratio of shoot water mass to shoot dry weight, respectively (Guo et al, 2013). …”

Section: Growth Parametersmentioning

confidence: 99%

Probing the responses of four chicory ecotypes by ethylene accumulation and growth characteristics under drought stress

Sadeghi¹,

Ghanaatiyan²

2017

Ital J Agronomy

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Water deficit is the largest limiting abiotic factor in agriculture and will increase in future. Evaluating the drought stress-induced changes in growth parameters as well as the leaves ethylene accumulation of medicinal plants to grow these in arid and semi-arid areas has particular importance. Chicory (Cichorium intybus L.) is a famous medicinal herbal plant which grows in most parts of Iran. A factorial greenhouse experiment was conducted to evaluate the effect of drought stress [100 (as a control), 80, 60 and 40% of field capacity (FC)] on morphophysiological parameters as well as the leaves ethylene accumulation of four chicory ecotypes. The results showed a significant effect of drought on plant height, leaf area, shoot moisture content and total dry matter production of chicory ecotypes which were reduced under drought stress. Under increasing drought level the Siyah Shiraz (Kh) ecotype performed better by maintaining more growth characters, thereby leading to more production of dry matter than the other ecotypes. Isfahan ecotype was the most affected by rising tensions and showed more reduction in growth traits. Drought stress also considerably changed leaf ethylene content, that made the leaf ethylene biosynthesis to be significantly higher under severe (60 and 40% FC) stress when compared to control (100% FC) and was significantly higher in drought-tolerant chicory ecotype (Kh). In general, it can be concluded that Kh was superior to other ecotypes in terms of growth and leaves ethylene accumulation, and can be suitable for cultivation in arid regions.

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Dissection of two quantitative trait loci for grain weight linked in repulsion on the long arm of chromosome 1 of rice (Oryza sativa L.)

Cited by 11 publications

References 24 publications

Fine mapping of qHd1, a minor heading date QTL with pleiotropism for yield traits in rice (Oryza sativa L.)

Fine mapping of qHd1, a minor heading date QTL with pleiotropism for yield traits in rice (Oryza sativa L.)

Dissection of the qTGW1.1 region into two tightly-linked minor QTLs having stable effects for grain weight in rice

Probing the responses of four chicory ecotypes by ethylene accumulation and growth characteristics under drought stress

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