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Rice (Oryza sativa L.) germplasm with better seedling emergence under direct sowing in flooded paddy field

Published online by Cambridge University Press:  05 March 2018

Junichi Kashiwagi Open the ORCID record for Junichi Kashiwagi [Opens in a new window] ,
Koji Hamada  and
Yutaka Jitsuyama
Junichi Kashiwagi*
Affiliation:
Crop Science Lab, Graduate School of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo 060-8589, Japan
Koji Hamada
Affiliation:
Transplanter engineering department, Kubota Ltd, Naniwa-ku, Osaka 556-8601, Japan
Yutaka Jitsuyama
Affiliation:
Crop Science Lab, Graduate School of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo 060-8589, Japan
*
*Corresponding author. E-mail: [email protected]
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Abstract

Direct sowing of rice in a flooded paddy field is a beneficial cultivation practice for water use and labour efficiency, compared to the transplanted cultivation. However, a drastic reduction in seedling emergence under flooded paddy fields is a serious constraint especially when the seeds fell at deeper soil layers. Suitable rice germplasm for the direct sowing in flooded paddy fields could ensure the success of this cultivation practice. Instead of laborious field-based screening systems, a pot-based screening method was adopted for simplicity and efficient evaluation of seedling emergence of a subset of world rice germplasm (n = 75) at different sowing depths. As a result, two rice genotypes, ‘Vary Futsi’ (landrace from Madagascar, non-glutinous, subspecies Indica) and ‘Dahonggu’ (landrace from China, non-glutinous, subspecies Indica), with consistently better seedling emergence were identified from a wide range of rice germplasm. These genotypes could serve as excellent parents for the breeding program in developing new rice cultivars with the improved seedling emergence in flooded paddy fields. There were no significant differences in the seedling emergence rate in flooded paddy conditions among the groups from various agro-geographical regions.

Keywords

core collectionhypoxia germinationOryza sativa Lpot-based screening method
Type
Research Article
Information
Plant Genetic Resources , Volume 16 , Issue 4 , August 2018 , pp. 352 - 358
Copyright
Copyright © NIAB 2018 

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