Developing a rice line with high leaf photosynthetic capacity equivalent to that of corn by pyramiding loci for enhancing photosynthetic rate

2016 Fiscal Year Final Research Report

• Project/Area Number: 26660013
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Crop production science
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: HIRASAWA Tadashi 東京農工大学, (連合)農学研究科(研究院), 名誉教授 (30015119)
• Research Collaborator: ADACHI Shunsuke ; OCHIAI Takayuki ; ATOBE Masafumi ; AO Risako ; NAKANO Ruri
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: イネ / ゲノム / 光合成 / 量的形質遺伝子座

Outline of Final Research Achievements

The high-yielding indica cultivar Takanari has one of the highest values of leaf photosynthetic rate (Pn) in rice. Five quantitative trait loci (QTLs) at which ‘Koshihikari’ alleles enhance Pn of rice in the Takanari genetic background were estimated on the short and long arms of chromosome 1, on the long arm of chromosome 3 and on the short and long arms of chromosome 7 and a line (HP-a) with 20 to 30% higher Pn value than that of Takanari was identified among backcrossed inbred lines derived from a cross between Takanari and Koshihikari. Four QTLs, which HP-a carries, were pyramided into a rice line via crosses among near isogenic lines carrying one QTL and it was demonstrated that the pyramided line showed high Pn value equivalent to that of HP-a. We then developed 20 rice lines carrying 2 to 5 QTLs in the genetic background of Takanari and compared Pn among lines. From a model analysis it was shown that each QTL increased Pn additively.

Free Research Field

作物学