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Plant Physiol, January 2000, Vol. 122, pp. 199-204
The Electron Partitioning between the Cytochrome and Alternative
Respiratory Pathways during Chilling Recovery in Two Cultivars of Maize
Differing in Chilling Sensitivity1
Miquel
Ribas-Carbo,*
Ricardo
Aroca,
Miquel A.
Gonzàlez-Meler,
Juan José
Irigoyen, and
Manuel
Sánchez-Díaz
Departamento de Fisiología Vegetal, Universidad de Navarra,
C/Irunlarrea s/n, 31008 Pamplona, Spain (M.R.-C., R.A., J.J.I.,
M.S.-D.); Carnegie Institution of Washington, Department of Plant
Biology, 260 Panama Street, Stanford, California 94305 (M.R.-C.);
and Department of Botany, Duke University, Box 91000, Durham, North
Carolina 27708 (M.A.G.-M.).
Chilling effects on respiration
during the recovery period were studied in two maize (Zea
mays L.) cultivars differing in their tolerance to chilling:
Penjalinan, a chilling-sensitive cultivar, and Z7, a chilling-tolerant
cultivar. Both cultivars were exposed to 5°C for 5 d, after
which measurements were taken at 25°C. Chlorophyll fluorescence
analysis in dark-adapted leaves showed less damage in cv Z7 than in cv
Penjalinan during recovery from the chilling treatment. Studies of the
electron partitioning between the cytochrome and the alternative
respiratory pathways during chilling recovery using the oxygen isotope
fractionation technique showed that, although total leaf respiration
was not affected by the chilling treatment in either of the two
cultivars, electron partitioning to the alternative pathway was
significantly increased in the more stressed chilling-sensitive cv
Penjalinan, suggesting that increased activity of the alternative
pathway is not related to the plant tolerance to chilling. These
results suggest a possible role of the alternative pathway in plants
under stress rather than specifically contributing to plant resistance to chilling.
1
This research was supported by the U.S.
Department of Agriculture National Research Initiative Competitive
Grants Program (grant no. 99-35306-7774 to M.A.G.-M.), the National
Science Foundation (grant no. DEB-94-15541 to the Duke University
Phytotron), the Projecto de Investigación de la Universidad de
Navarra (to M.R.-C.), a predoctoral fellowship from the
Asociación de Amigos de la Universidad de Navarra (to R.A.),
Gobierno de Navarra (O.F. 59/1996), and the Dirección General de
Investigacion Cientifica y Technica (Spain, grant no. PB 95-0831 to
J.J.I.). This is Carnegie Institution of Washington-Department of
Plant Biology no. 1,404.
*
Corresponding author; e-mail mribas{at}biosphere.stanford.edu; fax
650-3256857.
© 2000 American Society of Plant Physiologists
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