자포니카 다수성 벼 드래찬과 보람찬 유래 약배양 계통을 이용한 이삭 및 수량관련 형질 분석 및 다수성 계통 육성
Development of High-yielding Rice Lines and Analysis of Panicle and Yield-related Traits Using Doubled Haploid Lines Derived from the Cross between Deuraechan and Boramchan, High-yielding japonica Rice Cultivars in Korea
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자포니카 초다수성 품종으로 다수성에 관여하는 형질 특성이 다른 드래찬과 보람찬을 이용하여 이삭과 수량 관련 형질의 다양성이 증대된 약배양 유래 집단을 육성하고 다수성 계통을 선발하였다. 163개로 구성된 약배양 유래 집단과 선발된 다수성 13계통의 이삭 및 수량 관련 형질을 상관분석, 주성분분석 및 경로계수 분석을 통해 분석하였다. 이삭 관련 형질 중 2차 지경 착생립수가 1차 지경 착생립수에 비해 수당립수와 높은 정의 상관관계를 나타냈으며 수당립수가 증가하는쪽으로 기여도가 컸다. 형질들의 수량에 기여하는 정도를 보면 집단에서는 수당립수가 선발 계통에서는 수수가 수량성증진에 기여도가 가장 컸다. 수수는 집단과 선발 계통에서 모두 등숙률과 정의 상관을 나타냈다. 선발 계통에서 수수 증가에 의한 등숙률의 향상과 단위면적당 립수의 증가로 인한 수량성 향상이 수당립수 증가에 의한 향상 효과보다 컸다. 13개선발 계통 중 AC60, AC152, AC156, AC161 계통은 모부본인 드래찬(481 kg/10a)과 보람찬(559 kg/10a) 보다 높은 수량성을 나타냈다. 드래찬은 수수가 적고 수당립수가 많은 소얼 수중형을 나타냈으며 보람찬은 수수가 많고 등숙률이 높은 수수형에 가까웠다. 선발된 다수성 계통들은 모부본의 중간 형태의 형질 특성을 나타내며 개선된 잠재 수량성을 가지고 있다. 이들 우량 계통들은 자포니카 다수성 품종 개발을위해 활용될 수 있을 것이다.
Abstract
A doubled haploid (DH) lines derived from the cross between high-yielding japonica rice cultivars ‘Deuraechan’ and ‘Boramchan’ was developed to increase diversity of panicle and yield-related traits and select high-yielding lines. Panicle and yield-related traits of DH population consisting of 163 lines and 13 selected high-yielding lines were analyzed using correlation, principal component, and path analysis. Among panicle-related traits, number of spikelets on secondary rachis-branches (SRBs) was more highly correlated with and had more positive effect on number of spikelets (NS) than number of spikelets on primary rachis-branches (PRBs) per panicle. In the DH population, NS had the most positive effect on yield, whereas panicle number per hill (PN) was in the selected lines. PN was significantly positive correlated with ratio of ripened grain (RGG) in both case. The enhancement of ripening and increase of total spikelets number by increasing PN had more effect on yield than increase of total spiekelts number by increasing NS in the selected lines. Among 13 lines, four lines, AC60, AC152, AC156, and AC161 showed higher yield than Deuraechan (481 kg/10a) and Boramchan (558 kg/10a). Deuraechan exhibited panicle-weight type with low tiller and heavy panicles and Boramchan was slightly panicle-number type with more PN and higher RGG. Selected high-yielding lines showed medium characteristics of parents with improved yield potential. These elite lines could be utilized to develop high-yielding japonica rice.
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