A chlorate resistant mutant of rice (Oryza sativa L.) with normal nitrate uptake and nitrate reductase activity

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概要

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• Most mutants lacking nitrate reductase (NR) activity show a chlorate resistance, but a mutant line M1004, screened based on chlorate resistance, exhibited the same level of NR activity as the wild type Norin 8. Here, we characterized a mutant line M1004 and compared it with a NR deficient mutant line M819 and original cultivar Norin 8. M1004 showed a higher chlorate resistance than M819 at a higher chlorate concentration (1 mM). The same level of NO^-_3 and ClO^-_3 uptake as well as NRmRNA expression was observed in the mutant lines and wild type. NR-mRNA expression was induced in KClO_3 solution although the NR activity was inhibited. M1004 exhibited higher a deactivation velocity of NR than the wild type. The results suggested that chlorate resistance in M1004 was caused by the rapid deactivation of NR. This chlorate resistance was transmitted by a single recessive nuclear gene.

• 日本育種学会の論文

著者

• Ichii Masahiko

  Faculty Of Agriculture Kagawa University

• Ichii Masahiko

  Faculty Of Agriculture Department Of Life Sciences Kagawa University

• Zhao C‐m

  Faculty Of Agriculture Kagawa University

• HASEGAWA Hiroshi

  School of Environmental Science, University of Shiga Prefecture

• Zhao Chang-min

  Faculty Of Agriculture Department Of Life Sciences Kagawa University

• Hasegawa Hiroshi

  School Of Environmental Science The University Of Shiga Prefecture

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