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

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 d...

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Bibliographic Details
Published inPlant genetic resources: characterization and utilization Vol. 16; no. 4; pp. 352 - 358
Main Authors Kashiwagi, Junichi, Hamada, Koji, Jitsuyama, Yutaka
Format Journal Article
LanguageEnglish
Published Cambridge, UK Cambridge University Press 01.08.2018
Subjects
Cultivars
Cultivation
Emergence
Genotypes
Germplasm
Oryza sativa indica
Parents
Plant breeding
Plant growth
Rice
Rice fields
Screening
Seedlings
Seeds
Soil layers
Studies
Water use
Bangladesh
Madagascar
Japan
India
core collection
hypoxia germination
Oryza sativa L
pot-based screening method
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Summary: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.
ISSN:1479-2621
1479-263X
DOI:10.1017/S1479262118000011