Abstract
The aim of this study was to obtain the information for improvement in source ability via expansion of a flag leaf area in rice (Oryza sativa L.). We identified chromosome regions affecting a trait (CRATs) for leaf area and confirmed their effects with two sets of chromosome segment substitution lines developed from indica landraces Kasalath or Nona Bokra as a donor under japonica cultivar Koshihikari genetic background. We detected 4 and 8 CRATs that increased leaf area by Kasalath and Nona Bokra alleles, respectively. With the Nona Bokra allele, CRAT on chromosome 7 (LA7) increased leaf area by 54% comparing to Koshihikari. LA7 maintained the contents of Rubisco and photosynthetic rate and as a result its “estimated” source ability of a flag leaf was increased by 23%. The effect of LA7 was stable under different environmental conditions, and might be useful for breeding rice with higher source ability and yield.
Highlights
The aim of this study was to obtain the information for improvement in source ability via expansion of a flag leaf area in rice (Oryza sativa L.)
Detection of CRATs Phenotypic variations in leaf area tended to be different in Ko/Ka and Koshihikari/Nona Bokra (Ko/NB) chromosome segment substitution lines (CSSLs) (Fig. 1)
The leaf area was larger in Ko/NB CSSLs than in Ko/Ka CSSLs
Summary
The aim of this study was to obtain the information for improvement in source ability via expansion of a flag leaf area in rice (Oryza sativa L.). Increasing crop yield requires an improvement in carbohydrate production by source, which is a key target in breeding of rice (Oryza sativa L.) (Mann, 1999a, 1999b). Sink size, another determining factor of yield is given by the product of grain number and weight. Many QTLs have been detected for leaf area and nitrogen content per leaf area (Li et al, 1998; Ishimaru et al, 2001a, 2001b; Teng et al, 2004; Takai et al, 2005; Yue et al, 2006; Hirotsu et al, 2008) It is not clear whether these QTLs interact with another factor and eventually contribute to source ability or not
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