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2023 Vol.68, Issue 4 Preview Page
Establishing Optimal Conditions for LED-Based Speed Breeding System in Soybean [Glycine max (L.) Merr.]

LED 기반 콩[Glycine max (L.) Merr.] 세대단축 시스템 구축을 위한 조건 설정

Gyu Tae Park1†
,
Ji-Hyun Bae2†
,
Ju Seok Lee3
,
Soo-Kwon Park4
,
Dool-Yi Kim5
,
Jung-Kyung Moon4
,
Mi-Suk Seo5*
박 규태1†
,
배 지현2†
,
이 주석3
,
박 수권4
,
김 둘이5
,
문 중경4
,
서 미숙5*
1Ph.D. Researcher, Crop Foundation Division, National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea
2MSc Student, Crop Foundation Division, National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea
3Senior Researcher, Korea Research Institute of Bioscience and Biotechnology Bio-evaluation Center, Cheongju 28116, Korea
4Senior Researcher, Crop Foundation Division, National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea
5Researcher, Crop Foundation Division, National Institute of Crop Science, Rural Development Administration, Wanju 55365, Korea
1농촌진흥청 국립식량과학원 작물기초기반과 박사후연구원
2농촌진흥청 국립식량과학원 작물기초기반과 석사과정
3한국생명공학연구원 바이오평가센터 선임연구원
4농촌진흥청 국립식량과학원 작물기초기반과 농업연구관
5농촌진흥청 국립식량과학원 작물기초기반과 농업연구사
*Corresponding Author
†Theses authors contributed equally to this work.
1 December 2023. pp. 304-312
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Abstract

Plant breeding is a time-consuming process, mainly due to the limited annual generational advancement. A speed breeding system, using LED light sources, has been applied to accelerate generational progression in various crops. However, detailed protocols applicable to soybeans are still insufficient. In this study, we report the optimized protocols for a speed breeding system comprising 12 soybean varieties with various maturity ecotypes. We investigated the effects of two light qualities (RGB ratio), three levels of light intensity (PPFD), and two soil conditions on the flowering time and development of soybeans. Our results showed that an increase in the red wavelength of the light spectrum led to a delay in flowering time. Furthermore, as light intensity increased, flowering time, average internode length, and plant height decreased, while the number of nodes, branches, and pods increased. When compared to agronomic soil, horticultural soil resulted in an increase of more than 50% in the number of nodes, branches, and pods. Consequently, the optimal conditions were determined as follows: a 10-hour short-day photoperiod, an equal RGB ratio (1:1:1), light intensity exceeding 1,300 PPFD, and the use of horticultural soil. Under these conditions, the average flowering time was found to be 27.3±2.48 days, with an average seed yield of 7.9±2.67. Thus, the speed breeding systems reduced the flowering time by more than 40 days, compared to the average flowering time of Korean soybean resources (approximately 70 days). By using a controlled growth chamber that is unaffected by external environmental conditions, up to 6 generations can be achieved per year. The use of LED illumination and streamlined facilities further contributes to cost savings. This study highlights the substantial potential of integrating modern crop breeding techniques, such as digital breeding and genetic editing, with generational shortening systems to accelerate crop improvement.

Keywords
early flowering
LED
RGB ratio
soybean
speed breeding
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Information
  • Publisher :The Korean Society of Crop Science
  • Publisher(Ko) :한국작물학회
  • Journal Title :The Korean Journal of Crop Science
  • Journal Title(Ko) :한국작물학회지
  • Volume : 68
  • No :4
  • Pages :304-312
  • Received Date : 2023-09-25
  • Revised Date : 2023-11-08
  • Accepted Date : 2023-11-10
  • DOI :https://doi.org/10.7740/kjcs.2023.68.4.304
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