Kenji Irie
Tokyo University of Agriculture
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Featured researches published by Kenji Irie.
G3: Genes, Genomes, Genetics | 2017
Yuka Kitomi; Emari Nakao; Sawako Kawai; Noriko Kanno; Tsuyu Ando; Shuichi Fukuoka; Kenji Irie; Yusaku Uga
The volume that the root system can occupy is associated with the efficiency of water and nutrient uptake from soil. Genetic improvement of root length, which is a limiting factor for root distribution, is necessary for increasing crop production. In this report, we describe identification of two quantitative trait loci (QTLs) for maximal root length, QUICK ROOTING 1 (QRO1) on chromosome 2 and QRO2 on chromosome 6, in cultivated rice (Oryza sativa L.). We measured the maximal root length in 26 lines carrying chromosome segments from the long-rooted upland rice cultivar Kinandang Patong in the genetic background of the short-rooted lowland cultivar IR64. Five lines had longer roots than IR64. By rough mapping of the target regions in BC4F2 populations, we detected putative QTLs for maximal root length on chromosomes 2, 6, and 8. To fine-map these QTLs, we used BC4F3 recombinant homozygous lines. QRO1 was mapped between markers RM5651 and RM6107, which delimit a 1.7-Mb interval on chromosome 2, and QRO2 was mapped between markers RM20495 and RM3430-1, which delimit an 884-kb interval on chromosome 6. Both QTLs may be promising gene resources for improving root system architecture in rice.
Frontiers in Plant Science | 2015
Yu Takahashi; Kohtaro Iseki; Kumiko Kitazawa; Chiaki Muto; Prakit Somta; Kenji Irie; Ken Naito; Norihiko Tomooka
Genus Vigna comprise several domesticated species including cowpea and mungbean, and diverse wild species. We found an introgressive hybrid population derived from two wild species, Vigna umbellata and Vigna exilis, in Ratchaburi district, Thailand. The hybrid was morphologically similar to V. umbellata but habituated in a limestone rock mountain, which is usually dominated by V. exilis. Analyzing simple sequence repeat loci indicated the hybrid has undergone at least one round of backcross by V. umbellata. We found the hybrid acquired vigorous growth from V. umbellata and drought tolerance plus early flowering from V. exilis, and thus has taken over some habitats of V. exilis in limestone karsts. Given the wide crossability of V. umbellata, the hybrid can be a valuable genetic resource to improve drought tolerance of some domesticated species.
African Journal of Agricultural Research | 2011
Simon Alibu; Yuri Saito; Hironobu Shiwachi; Kenji Irie
Tropical agriculture and development | 2010
Pachakkil Babil; Kenji Irie; Hironobu Shiwachi; Ye Tint Tun; Hidekazu Toyohara; Hiroshi Fujimaki
Tropical agriculture and development | 2015
Hironobu Shiwachi; Hidehiko Kikuno; Junya Ohata; Yu Kikuchi; Kenji Irie
Tropical agriculture and development | 2012
Pachakkil Babil; Daisuke Yasuhara; Keisuke Sakaguchi; Tsukasa Iwashina; Kenji Irie; Hironobu Shiwachi; Hidekazu Toyohara; Hiroshi Fujimaki
Journal of International Society for Southeast Asian Agricultural Sciences | 2011
Jerome Jonathan Mghase; Hironobu Shiwachi; Hisamitsu Takahashi; Kenji Irie
Japanese journal of tropical agriculture | 1998
Hidekazu Toyohara; Hironori Tanifuji; Kenji Irie; Masaki Takahashi; Takao Myoda; Fumio Kikuchi
Tropical agriculture and development | 2010
Ryo Matsumoto; Hironobu Shiwachi; Hidehiko Kikuno; Kenji Irie; Hidekazu Toyohara; Atsushi Komamine; Hiroshi Fujimaki
Japanese journal of tropical agriculture | 2006
Ye Tint Tun; Kenji Irie; Than Sein; Kazuto Shirata; Hidekazu Toyohara; Fumio Kikuchi; Hiroshi Fujimaki