Identification and crop performance of acid sulfate soil-tolerant rice varieties |
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Authors: | Dong-Jin Kang Young-Jin Seo Byoung-Kyu Lee Pisoot Vijarnsorn Ryuichi Ishii |
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Institution: | 1.College of Bioresource Sciences,Nihon University,Fujisawa,Japan;2.Kyungpook Agricultural Technology Station,Daegu,Republic of Korea;3.National Institute of Crop Science,Suwon,Republic of Korea;4.Acid Sulfate Soil Improvement Experiment Station,Nakhon Nayok,Thailand |
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Abstract: | The present study aims to: 1) identify acid sulfate soil (ASS)-tolerant rice varieties from the genetic stock of Korean rice
(Oryza sativa L.) varieties under ASS conditions; 2) to evaluate their yield performance, and elucidate the physiological mechanism for
ASS tolerance with the identified tolerant varieties. Two hundred sixty-six rice varieties were screened for ASS tolerance,
and we identified two japonica-indica hybrid varieties, Geumgang (GG) and Pungsan (PS), as having high tolerance under ASS
paddy conditions (pH 3). We first conducted a yield trial of GG and PS grown in Wagner pots to determine their potential yields
under ASS conditions. A yield trial under paddy field condition followed. In the pot experiment, the ASS-tolerant varieties,
GG and PS, showed significantly higher yields than PT-1, which is a local reference variety in mildly improved soil pH conditions
(pH 4.1–4.6). Al and Fe content in GG and PS were significantly lower than that of PT-1, so there might be some mechanism
that inhibits the absorption of toxic metal ions in the tolerant varieties. In the paddy conditions, the grain yields more
than 5 t ha−1 of the two tolerant varieties under mildly improved soil pH condition were significantly higher than PT-1. Dry matter weights
of above ground parts also showed the same trend as grain yield. The study demonstrated that the ASS-tolerant japonica-indica
rice varieties with high yielding potential could contribute to the improvement of rice yield in ASS regions, and will be
good materials for the development of acid soil-tolerant rice varieties. |
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