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Development and Characterization of Rice Lines with Clustered Spikelets and Dense Panicles
군집소수를 가진 고착립밀도 이삭형 벼 개발 및 특성 분석
Korean. J. Breed. Sci. 2018;50(4):415-423
Published online December 1, 2018
© 2018 Korean Society of Breeding Science.

Hyun-Su Park*, Man-Kee Baek, Choon-Song Kim, Gun-Mi Lee, Seul-Gi Park, Chang-Min Lee, Jung-Pil Suh, and Young-Chan Cho
박현수*, 백만기, 김춘송, 이건미, 박슬기, 이창민, 서정필, 조영찬

National Institute of Crop Science, RDA, Wanju, 55365, Republic of Korea
농촌진흥청 국립식량과학원
Correspondence to: E-mail: mayoe@korea.kr, Tel: +82-63-238-5214, Fax: +82-63-238-5205
Received October 1, 2018; Revised October 1, 2018; Accepted October 24, 2018.
This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Rice panicle architecture is an important factor affecting yield potential. Korean rice cultivars have a narrow genetic background for panicle architecture. To enhance the yield potential of Korean rice cultivars, we developed and characterized rice lines with new panicle architecture. Rice with improved panicle architecture has clustered spikelets and dense panicles (CD type). CD rice was derived from a cross between “Binhae Col.#1” carrying dense panicles, and “ARC10319” that has the clustered spikelets gene (Cl). CD rice lines had short and semi-erect panicles with two to five high density spikelets clustered at the tips of primary and secondary rachis branches. CD rice lines had dramatically increased numbers of spikelets; almost twice as many as those of Korean rice cultivars. The increase in spikelet number was mainly caused by the increased spikelets and branches on secondary rachises compared to those on primary rachises. The increase in spikelet number was expected to enhance the yield of CD rice by expanding sink capacity. However, the yield of selected lines; CD9, CD27, CD34, and CD39, did not reach the level of the Korean high-yielding cultivars “Boramchan” and “Hanareum2,” due to the reduction in panicle number and grain weight, and poor ripening. Although no substantial yield increase was observed in CD rice, the panicle architecture of CD rice, clustered spikelets, and dense panicles could be new genetic resources as breeding material for diversifying panicle architecture and enhancing yield potential.
Keywords : Rice, Panicle architecture, Clustered spikelets, Dense panicle, Yield


December 2018, 50 (4)
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