The electron partitioning between the cytochrome and alternative respiratory pathways during chilling recovery in two cultivars of maize differing in chilling sensitivity

被引:100
作者
Ribas-Carbo, M
Aroca, R
Gonzàlez-Meler, MA
Irigoyen, JJ
Sánchez-Díaz, M
机构
[1] Univ Navarra, Dept Fis Vegetal, Pamplona 31008, Spain
[2] Carnegie Inst Sci, Dept Plant Biol, Stanford, CA 94305 USA
[3] Duke Univ, Dept Bot, Durham, NC 27708 USA
关键词
D O I
10.1104/pp.122.1.199
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 degrees C for 5 d, after which measurements were taken at 25 degrees 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 chiliing.
引用
收藏
页码:199 / 204
页数:6
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