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Effect of Sink and Source Related Characteristics on Grain Weight and Grain Nitrogen Content in Rice  

Lee, Chung-Kuen (National Institute of Crop Science, RDA)
Kwon, Young-Up (National Institute of Crop Science, RDA)
Lee, Jae-Eun (National Institute of Crop Science, RDA)
Seo, Jong-Ho (National Institute of Crop Science, RDA)
Shin, Jin-Chul (National Institute of Crop Science, RDA)
Lee, Byun-Woo (College of Agriculture and Life Science, Seoul Nat'l Univ.)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.54, no.1, 2009 , pp. 45-54 More about this Journal
Abstract
This experiment was conducted to clarify the effects of source and sink related characteristics on grain weight increase and grain nitrogen accumulation in rice. Source was modified by leaf removing treatment with no sink modification in 2002 and sink and source were modified at the same time by different sowing dates, N fertilization rates, row spacings, and thinning treatments at heading in 2007. Grain weight (GW) and grain assimilates produced by photosynthesis during grain-filling ($GW_P$) increased with the increase of source, while the grain assimilates retranslocated from leaf and stem ($GW_T$) decreased. Among the source-related characters, shoot dry weight were most closely related with GW. GW was dependant on $GW_P$ rather than on $GW_T$. Grain nitrogen content (GN) and grain nitrogen absorbed from soil during grain-filling ($GN_S$) increased with the increase of source, while the grain nitrogen retranslocated from leaf and stem ($GN_T$) decreased. Shoot nitrogen content among the source-related characters was related most closely with GN. The contribution of $GN_T$ to GN was relatively large although GN depended more largely on $GN_S$ than $GN_T$. In addition, GN was supplied firstly from $GN_S$ or from $GN_S$ and $GN_T$ at the same time.
Keywords
rice; sink; source; grain weight; grain nitrogen content; leaf area index; shoot dry weight; shoot nitrogen content; grain number;
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