Sodium (Na) exclusion is vital for plants to cope with salt stress, and the plasma membrane Na+/H+ antiporter, SALT OVERLY SENSITIVE 1 (SOS1), has been known to play a central role in this process although the function of this molecule is not completely understood. In this study, we performed 22Na+ radiotracer experiments to investigate the function of SOS1 in the mature root zone. Arabidopsis thaliana seedlings were placed on the gel medium, which had air gaps to separate the medium at the mature root zone from that at the root apex zone. Then, 22Na+ was added to the root apex zone for 4 h, and the radioactivity in the mature root zone with 5 mm in length and in the mature root zone gel was measured. As a result, we found that knock-out of SOS1 caused 22Na+ accumulation in the mature root zone and reduction of 22Na+ exclusion to the gel, demonstrating that Na+ delivered via the xylem is excluded to the rhizosphere by SOS1 in the mature root zone.
{"title":"Development of the Experimental Method to Evaluate Sodium Ion Exclusion in the Mature Root Zone of <i>Arabidopsis thaliana</i>","authors":"Tomoki Nagata, Mio Nagoya, Takaaki Ogura, Yuko Kurita, Natsuko I. Kobayashi, Keitaro Tanoi","doi":"10.3769/radioisotopes.72.235","DOIUrl":"https://doi.org/10.3769/radioisotopes.72.235","url":null,"abstract":"Sodium (Na) exclusion is vital for plants to cope with salt stress, and the plasma membrane Na+/H+ antiporter, SALT OVERLY SENSITIVE 1 (SOS1), has been known to play a central role in this process although the function of this molecule is not completely understood. In this study, we performed 22Na+ radiotracer experiments to investigate the function of SOS1 in the mature root zone. Arabidopsis thaliana seedlings were placed on the gel medium, which had air gaps to separate the medium at the mature root zone from that at the root apex zone. Then, 22Na+ was added to the root apex zone for 4 h, and the radioactivity in the mature root zone with 5 mm in length and in the mature root zone gel was measured. As a result, we found that knock-out of SOS1 caused 22Na+ accumulation in the mature root zone and reduction of 22Na+ exclusion to the gel, demonstrating that Na+ delivered via the xylem is excluded to the rhizosphere by SOS1 in the mature root zone.","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-15DOI: 10.3769/radioisotopes.72.185
M. Hatsuda
{"title":"Superstring Theory —In Search of the Ultimate Theory to Unify the Four Forces—","authors":"M. Hatsuda","doi":"10.3769/radioisotopes.72.185","DOIUrl":"https://doi.org/10.3769/radioisotopes.72.185","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75407345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-15DOI: 10.3769/radioisotopes.72.163
Nguyễn Thị Nguyệt Hà, Nguyễn Thị Thúy Linh, Nguyễn An Sơn, N. Sang, Phạm Thị Ngọc Hà, Le Doan Dinh Duc, Tamikazu Kume
{"title":"低エネルギーX線によるタマネギおよびジャガイモ発芽防止のための効果的照射方法","authors":"Nguyễn Thị Nguyệt Hà, Nguyễn Thị Thúy Linh, Nguyễn An Sơn, N. Sang, Phạm Thị Ngọc Hà, Le Doan Dinh Duc, Tamikazu Kume","doi":"10.3769/radioisotopes.72.163","DOIUrl":"https://doi.org/10.3769/radioisotopes.72.163","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75348506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-15DOI: 10.3769/radioisotopes.72.197
S. Hasegawa
{"title":"Development of Methodology of Isotope Manipulation of Laser Resonance Excitation for Trace Trace Isotope Analysis","authors":"S. Hasegawa","doi":"10.3769/radioisotopes.72.197","DOIUrl":"https://doi.org/10.3769/radioisotopes.72.197","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90926071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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