Seed vigor of contrasting rice cultivars in response to elevated carbon dioxide

Chen, Chen and Jiang, Qian and Ziska, Lewis H. and Zhu, Jianguo and Liu, Gang and Zhang, Jihuang and Ni, Kang and Seneweera, Saman and Zhu, Chunwu (2015) Seed vigor of contrasting rice cultivars in response to elevated carbon dioxide. Field Crops Research, 178. pp. 63-68. ISSN 0378-4290

Abstract

Although a number of studies have shown that rising atmospheric carbon dioxide concentration, [CO2], can differentially affect the growth and yield potential of rice (Oryza sativa L.) cultivars, there has been no attempt to determine if the response is associated with changes in seed vigor, an essential aspect of crop establishment. Because previous investigations have shown that [CO2] can change the grain structure and quality of rice seed, we hypothesized that [CO2] would decrease vigor via decreased germination rates. To test this hypothesis, we used an in situ, free-air CO2 enrichment (FACE) system to assess seed quality in six rice cultivars that differed in their growth and reproductive response to rising [CO2]. Elevated [CO2] had no effect on seed hull thickness or seed specific gravity, but did significantly reduce total nitrogen and protein concentration for all cultivars. Despite the changes in grain physical and chemical traits associated with germination, no clear indication of quantitative effects of elevated [CO2] on rice germination was found.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 03 May 2016 02:45
Last Modified: 20 Jul 2016 04:00
Uncontrolled Keywords: cultivars; elevated CO2; germination rate; germination energy; seed vigor
Fields of Research : 05 Environmental Sciences > 0501 Ecological Applications > 050102 Ecosystem Function
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
05 Environmental Sciences > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change
Identification Number or DOI: 10.1016/j.fcr.2015.03.023
URI: http://eprints.usq.edu.au/id/eprint/28803

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