Substitution Mapping of a Locus Responsible for Hybrid Breakdown in Populations Derived From Interspecific Introgression Line
| Autor: | Yoshiyuki Yamagata, Shao Hui Zheng, Daisuke Fujita, Zita Demeter, Nilsa Emilia Munguambe, Hideshi Yasui, Shouta Inoue |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Population Introgression tiller number Locus (genetics) Plant Science Quantitative trait locus 01 natural sciences Japonica SB1-1110 Gene flow 03 medical and health sciences hybrid breakdown education Original Research substitution mapping Genetics education.field_of_study Oryza sativa biology rice Plant culture food and beverages Oryza meridionalis biology.organism_classification 030104 developmental biology Chromosome 4 010606 plant biology & botany |
| Zdroj: | Frontiers in Plant Science Frontiers in Plant Science, Vol 12 (2021) |
| ISSN: | 1664-462X |
| DOI: | 10.3389/fpls.2021.633247 |
| Popis: | Hybrid breakdown, a form of postzygotic reproductive barrier, has been reported to hinder gene flow in many crosses between wild and cultivated rice. Here, the phenomenon of hybrid breakdown was observed as low-tillering (i.e., low tiller number) in some progeny of an interspecific cross produced in an attempt to introduce Oryza meridionalis Ng (W1625) chromosomal segments into Oryza sativa L. ssp. japonica “Taichung 65” (T65). Low-tillering lines were obtained in BC4-derived progeny from a cross between W1625 and “Taichung 65,” but the locus for low-tillering could not be mapped in segregating populations. As a second approach to map the locus for low-tillering, we analyzed an F2 population derived from a cross between the low-tillering lines and a high-yielding indica cultivar, “Takanari.” A major QTL for low-tillering, qLTN4, was detected between PCR-based markers MS10 and RM307 on the long arm of chromosome 4, with a LOD score of 15.6. The low-tillering phenotype was associated with weak growth and pale yellow phenotype; however, low-tillering plant had less reduction of grain fertility. In an F4 population (4896 plants), 563 recombinant plants were identified and the low-tillering locus was delimited to a 4.6-Mbp region between markers W1 and C5-indel3729. This region could not be further delimited because recombination is restricted in this region of qLTN4, which is near the centromere. Understanding the genetic basis of hybrid breakdown, including the low-tillering habit, will be important for improving varieties in rice breeding. |
| Databáze: | OpenAIRE |
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