TY - JOUR
T1 - Root growth response of rainfed lowland rice to aerobic conditions in northeastern Thailand
AU - Kato, Yoichiro
AU - Tajima, Ryosuke
AU - Homma, Koki
AU - Toriumi, Akiko
AU - Yamagishi, Junko
AU - Shiraiwa, Tatsuhiko
AU - Mekwatanakarn, Poonsak
AU - Jongdee, Boonrat
N1 - Funding Information:
Acknowledgements The authors are grateful to the staff of the Ubon Ratchathani Rice Research Center for their support, and to Dr. Bill Hardy (International Rice Research Institute, Philippines) for providing comments on the manuscript. This work was supported in part by a Grant-in-Aid for Scientific Research (No. 22405015) from the Japan Society for the Promotion of Science.
PY - 2013/7
Y1 - 2013/7
N2 - Background and aims: Rice plants alternately experience anaerobic and aerobic conditions during their life cycle in rainfed lowlands. Each condition affects root growth differently. Our objective was to clarify the specific rice root response to aerobic conditions in rainfed lowlands. Methods: At the Ubon Ratchathani Rice Research Center in northeastern Thailand, we obtained root samples from 17 'Surin1' (Thai variety) BC3-derived lines and 7 CT9993-5-10-1-M × IR62266-42-6-2 doubled-haploid lines from flooded and non-flooded paddy fields at the reproductive stage in 2010 and 2011. Results: In the non-flooded trial, rice was grown aerobically by draining the perched water; soil moisture at a depth of 20 cm fluctuated between -10 and -30 kPa. Deep rooting was likely promoted under aerobic conditions, but slightly drier soils under longer dry spells seemed to restrict root penetration, as the topsoil rapidly hardened during dry spells of only a few days. Fine-root development in the topsoil was inhibited under aerobic conditions. Conclusions: Even without drought stress, rice roots respond significantly to the disappearance of standing water in rainfed lowlands via deep rooting and root branching. We identified one promising 'Surin1' BC3-derived line showing an adaptive response of deep rooting under aerobic conditions, which can be used as a breeding material for rainfed lowland rice in Thailand.
AB - Background and aims: Rice plants alternately experience anaerobic and aerobic conditions during their life cycle in rainfed lowlands. Each condition affects root growth differently. Our objective was to clarify the specific rice root response to aerobic conditions in rainfed lowlands. Methods: At the Ubon Ratchathani Rice Research Center in northeastern Thailand, we obtained root samples from 17 'Surin1' (Thai variety) BC3-derived lines and 7 CT9993-5-10-1-M × IR62266-42-6-2 doubled-haploid lines from flooded and non-flooded paddy fields at the reproductive stage in 2010 and 2011. Results: In the non-flooded trial, rice was grown aerobically by draining the perched water; soil moisture at a depth of 20 cm fluctuated between -10 and -30 kPa. Deep rooting was likely promoted under aerobic conditions, but slightly drier soils under longer dry spells seemed to restrict root penetration, as the topsoil rapidly hardened during dry spells of only a few days. Fine-root development in the topsoil was inhibited under aerobic conditions. Conclusions: Even without drought stress, rice roots respond significantly to the disappearance of standing water in rainfed lowlands via deep rooting and root branching. We identified one promising 'Surin1' BC3-derived line showing an adaptive response of deep rooting under aerobic conditions, which can be used as a breeding material for rainfed lowland rice in Thailand.
KW - Drought
KW - Northeast Thailand
KW - Rainfed lowland rice
KW - Root system architecture
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U2 - 10.1007/s11104-012-1538-3
DO - 10.1007/s11104-012-1538-3
M3 - Article
AN - SCOPUS:84879145477
SN - 0032-079X
VL - 368
SP - 557
EP - 567
JO - Plant and Soil
JF - Plant and Soil
IS - 1-2
ER -