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Dormancy in red rice. IV. Response of unimbibed and imbibing seeds to nitrogen dioxide
Author(s) -
Cohn Marc Alan,
Castle Laurence
Publication year - 1984
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1984.tb04926.x
Subject(s) - germination , dormancy , moisture , incubation , nitrogen , agronomy , oryza sativa , chemistry , carbon dioxide , seed dormancy , horticulture , biology , biochemistry , organic chemistry , gene
Nitrogen dioxide at 4 to 8 ml 1 −1 breaks dormancy of dehulled, unimbibed seeds of red rice ( Oryza sativa L.) with minimum exposure times to the gas of 20 min or less. The response is independent of incubation medium pH following treatment. Germination is complete within 2 days but proceeds 4 to 6 h more slowly than non‐dormant controls. The magnitude of response at a constant NO 2 dose is dependent upon initial seed moisture. There was less than 40% germination at 9.6% initial moisture while germination was 95% at 12% initial moisture. NO 2 treatment also breaks dormancy of imbibing, dehulled seeds, but the response is dependent upon the pH of the medium. Dormancy is broken at pHs close to the pK a of nitrous acid. Intact, unimbibed or imbibing seeds respond to NO 2 treatment only if partially dry‐afterripened prior to exposure.