Characterization of cold-induced changes in the fatty acids profile of rice seedlings
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ORIGINAL PAPER
Characterization of cold-induced changes in the fatty acids profile of rice seedlings Guilherme Sassaki • Andrea B. Schmidt • Marcio E. Ferreira • Paulo H. N. Rangel • Adaucto B. Pereira-Netto
Received: 11 September 2012 / Revised: 15 January 2013 / Accepted: 4 February 2013 / Published online: 17 February 2013 Ó Franciszek Go´rski Institute of Plant Physiology, Polish Academy of Sciences, Krako´w 2013
Abstract Rice, a staple food for more than one half of the world’s population, is one of the most cold-sensitive cereals. Breeding programs aimed at increasing rice production are expected to reduce cold-imposed grain losses. Several reports have demonstrated that cold induce differential effects on the fatty acids profile of membranes in chilling-sensitive and chilling-tolerant plants. In this work, we evaluated changes in fatty acid (FA) composition as a potential screening tool to evaluate chilling sensitivity of rice accessions. Cold exposure led to the preferential accumulation of the polyunsaturated linolenic and linoleic FAs and reduction of palmitic and stearic FAs, besides
Communicated by J.-H. Liu. G. Sassaki Department of Biochemistry and Molecular Biology-SCB, Centro Polite´cnico-Parana Federal University, Curitiba, PR 81531-970, Brazil Present Address: A. B. Schmidt Pioneer seeds division, Du Pont of Brasil, Rodovia TO 050 KM 24, Zona Rural, Palmas, TO 70770-900, Brazil M. E. Ferreira Laboratory of Genetics, Embrapa genetic resources and biotechnology, SAIN Parque Estac¸a˜o Biolo´gica, Brasilia, DF 70770-917, Brazil P. H. N. Rangel Embrapa Rice and beans, PO Box 179, Santo Antonio de Goia´s, GO 75375-000, Brazil A. B. Pereira-Netto (&) Department of Botany-SCB, Centro Polite´cnico-Parana Federal University, Curitiba, PR 81531-970, Brazil e-mail: [email protected]
showing increased lignoceric acid content in roots of the variety. Similarly, roots of cold-exposed line Quila 66304 also presented preferential accumulation of linolenic and linoleic FAs and reduction of palmitic and stearic FAs. Cold exposure also led to enhanced levels of palmitic acid in shoots of Amaroo and, in a smaller extent, in shoots of Quila 66304. Linolenic acid was reduced in the shoots of both Amaroo and Quila 66304, while oleic acid content was reduced in shoots of Amaroo and slightly increased in shoots of Quila 66304. Double-bond index analysis indicated that 18 carbons FAs DBI for roots might be a good screening tool for cold response in rice. Results in this report demonstrate that cold-induced changes in FA profile represent a useful screening tool for early identification of differences in cold acclimation potential among rice accessions. Keywords Cold sensitivity Double-bond index Oryza sativa Polyunsaturated fatty acid
Introduction Low temperature is the major growth-limiting factor for warm-season plants (Lee et al. 2005). One of the most important, adverse, effects of low temperature on plants is altered functional properties of cellular membranes in leaves and/or roots. Cold, at the cellular and
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