Marker-assisted breeding of the rice restorer line Wanhui 6725 for disease resistance, submergence tolerance and aromatic fragrance

Published Date
December 2016, 9:66

Open AccessOriginal article

First Online: 

01 December 2016

DOI: 10.1186/s12284-016-0139-9

Cite this article as: 

Luo, Y., Ma, T., Zhang, A. et al. Rice (2016) 9: 66. doi:10.1186/s12284-016-0139-9

Author

• Yanchang Luo
• Tingchen Ma
• Aifang Zhang
• Kar Hui Ong
• Zefu Li
• Jianbo Yang
• Zhongchao Yin

Abstract

Background 

Rice is a staple food crop in the world. With the increase in world population and economic development, farmers need to produce more rice in limited field. However, the rice production is frequently affected by biotic and abiotic stresses. The use of natural disease resistance and stress tolerance through genetic breeding is the most efficient and economical way to combat or acclimate to these stresses. In addition, rice with aromatic fragrance can significantly increase market value for its good grain quality. Mianhui 725 (MH725) is an elite restorer line that has been widely used to produce three-line hybrid rice in China. We previously introduced rice bacterial blight resistance genes Xa4 and Xa21 into MH725 and obtained an introgression rice line Wanhui 421 (WH421), which theoretically possesses 96.9% genetic background of MH725.

Results

Here we report the introduction and pyramiding of disease resistance genes Xa27 and Pi9, submergence tolerance gene Sub1A and aromatic fragrance gene badh2.1 in WH421 through backcrossing and marker-assisted selection. The newly developed introgression rice line was designated as Wanhui 6725 (WH6725), which theoretically possesses 95.0% genetic background of MH725. WH6725 and its hybrid rice conferred disease resistance to both blast and bacterial blight diseases and showed tolerance to submergence for over 14 days without significant loss of viability. Compared with non-aromatic rice MH725, WH6725 has strong aromatic fragrance. The major important agronomic traits and grain quality of WH6725 and its hybrid rice obtained in field trials were similar to those of MH725 and the control hybrid rice, indicating that WH6725 is as good as MH725 when it is used as a restorer line for three-line hybrid rice production.

Conclusion

We have successfully developed a new restorer line WH6725 with disease resistance to rice blast and bacterial blight, tolerance to submergence and aromatic fragrance, which can be used to replace MH725 for hybrid rice production.

Keywords

badh2.1Pi9Sub1AXa4Xa21Xa27Mianhui 725Wanhui 6725Marker-assisted selection

Abbreviations

BADH2

Betaine aldehyde dehydrogenase gene

CMS

Cytoplasmic male sterile

MAS

Marker-assisted selection

MH725

Mianhui 725

PCR

Polymerase chain reaction

R

Resistance gene

STS

Sequence-tagged site

TGMS

Thermosensitive-genic male sterility

WH421

Wanhui 421

WH6725

Wanhui 6725.

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