This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Cohn, M. A. Articles by Hughes, J. A. Search for Related Content PubMed PubMed Citation Articles by Cohn, M. A. Articles by Hughes, J. A. Agricola Articles by Cohn, M. A. Articles by Hughes, J. A.

Articles

Seed Dormancy in Red Rice ¹

III. Response to Nitrite, Nitrate, and Ammonium Ions

Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge, Louisiana 70803

Sodium nitrite at 10 millimolar breaks dormancy of dehulled red rice (Oryza sativa). While germination is light independent, low pH conditions (pH 3) are required for maximum response. Water and buffer controls at pH 3 remain dormant. The response to nitrite occurs at 25 and 30°C but is reduced at 20°C, although nondormant seeds germinate readily at this temperature. The contact time for response to nitrite is less than 2 h at the start of imbibition. Seeds imbibed first in water show reduced germination when subsequently transferred to nitrite. Dehulled seeds show little or no response to nitrate and ammonium ions.

Intact seeds remain dormant in the presence of nitrite or nitrate unless partially dry-afterripened. The pH dependence of nitrite sensitivity is reduced in intact, afterripening seeds. In highly dormant seeds, vacuum infiltration experiments suggest that the hull restricts uptake of nitrite.

¹ Supported in part by the United States Department of Agriculture, Agricultural Research Service, Southern Region, under Agreement No. 58-7B30-0223.

This article has been cited by other articles:

				J. M. Frantz and B. Bugbee Anaerobic conditions improve germination of a gibberellic acid deficient rice Crop Sci., March 1, 2002; 42(2): 651 - 654. [Abstract] [Full Text] [PDF]