A Dwarfing Gene sd1-d (Dee-geo-woo-gen dwarf) on Lodging Resistance and Related Traits in Rice

Authors

  • Mukunda Bhattarai United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Ehime, Japan
  • Misa Kamimukai United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Ehime, Japan
  • Birendra Bahadur Rana Nepal Agricultural Research Council, National Potato Research Program, Khumaltar, Lalitpur, Nepal
  • Hiroki Oue United Graduate School of Agricultural Sciences, Ehime University, Matsuyama, Ehime, Japan
  • Shinji Matsumura Faculty of Agriculture, Kagawa University, Miki, Kagawa, Japan
  • Masayuki Murai Faculty of Agriculture and Marine Science, Kochi University, Otsu-200, Monobe, Nankoku, Kochi, Japan

DOI:

https://doi.org/10.3126/jnarc.v7i1.36913

Keywords:

Dwarfing allele, Lodging, Rice, sd1-d, SD1-in, SD1-ja

Abstract

A dwarfing allele at the sd1 locus on chromosome 1 in rice, sd1-d, has been playing important role for developing lodging-resistant and high-yielding indica varieties IR8 and IR36. The dominant allele SD1 for long culm at the locus is differentiated into SD1-in and SD1-ja that are harbored in indica and japonica subspecies, respectively. The sd1-d of IR36 was substituted with SD1-in or SD1-ja by 17 backcrosses with IR36, and two isogenic tall lines were developed by using an indica variety IR5867 and a japonica one ‘Koshihikari’ as donors, which were denoted by “5867-36” and “Koshi-36’’, respectively. The present study was conducted to examine the effect of dwarfing gene sd1-d on lodging resistance and related traits, compared with SD1-in and SD1-ja. Two isogenic lines and IR36 were cultivated in the field of the Faculty of Agriculture and Marine Science, Kochi University, Japan during 2017. Regarding index of lodging (g·cm/g × 100), genotypes were in the order: 5867-36 (97.4) > Koshi-36 (74.1) > IR36 (46.0) on the 21st-day after 80%-heading, and they were in the same order on 10th-day after 80%-heading. The 4th-panicle length (cm) was in the order: 5867-36 (118.7) > Koshi-36 (97.6) > IR36 (78.6). Similarly, the 4th-top weight (g) was in the order: 5867-36 (12.2) > Koshi-36 (10.2) > IR36 (9.6). The highest breaking strength (g) was recorded in IR36 (1649) followed by 5867-36 (1493) whereas the lowest breaking strength (g) was recorded in Koshi-36 (1360). Consequently, it is inferred that sd1-d enhances lodging resistance due to the decreases in the length and weight above the 4th-internode as well as the increase of breaking strength. The effect of SD1-in on lodging resistance is lower than that of SD1-ja.

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Published

2021-04-30

How to Cite

Bhattarai, M., Kamimukai, M., Rana, B. B., Oue, H., Matsumura, S., & Murai, M. (2021). A Dwarfing Gene sd1-d (Dee-geo-woo-gen dwarf) on Lodging Resistance and Related Traits in Rice. Journal of Nepal Agricultural Research Council, 7(1), 1–9. https://doi.org/10.3126/jnarc.v7i1.36913

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