Abstract
Plant height (PH) has strong genetic associations with plant height components (PHC), such as spike length (SL), the first (FIL), second (SIL), third (TIL) and fourth internode length (FOIL) from the top. To dissect the genetic relationships between PH and individual PHC, both unconditional (UAM) and conditional association mapping (CAM) were conducted by phenotyping 278 japonica rice (Oryza sativa L. subsp. japonica) accessions with 154 polymorphic SSR markers in 2010 and 2011. A total of 26 significant marker‐trait associations (MTAs) (P < 0.001) for PH were identified by using UAM within 19 markers in both years. Seven of the 19 markers were associated with PH in both 2010 and 2011. By using CAM, additional 35 significant MTAs (P < 0.001) were identified within 27 markers in 2 yr, when the influences of SL, FIL, SIL, TIL and FOIL were excluded. Four of the 27 markers were suppressed by different components in both years. CAM indicated that TIL contributed the most to PH, followed by SL, FOIL, SIL, and FIL. Any associated marker for PH identified by UAM and CAM was associated with at least one of the five PHC traits and explained 2.76 ∼ 15.20% of the phenotypic variation. The CAM could be used to evaluate genetic relationships between PH and PHC, and efficiently and precisely reveal counteracting associated markers. This study will provide theoretical bases for the improvement of PH in rice breeding programs.
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