Abstract
Hybrid Pennisetum (Pennisetum americanum×P. purpureum) is a widely used bioenergy grass that could also serve as forage for livestock production. In a pot experiment, breed No.1 and breed No. 2 of hybrid Pennisetum were treated with 15°C /10°C day/night temperature for 10 days. Results showed that yield and photosynthesis of breed No. 1 were higher than those of breed No. 2 under low temperature. The unsaturated fatty acid content and the DBI (double bond index) of the major membrane lipid of MGDG (monogalactosyldiacylglycerols), DGDG (digalactosyldiacylglycerols), PG (phosphatidylglycerols), PC (phosphatidylcholines) and PE (phosphatidylethanolamine) of breed No. 1 were significantly increased, while significantly decreased for breed No. 2. We also observed an increase in the proportion of unsaturated fatty acids and a decrease in the proportion of saturated fatty acids under low temperature for breed No. 1, while it was reverse for breed No. 2. Thes results inducate that chilling resistance of breed No. 1 was improved by enhancing the unsaturation of membrane lipid under low temperature. These findings would be useful for understanding mechanism of chilling resistance and the production of hybrid Pennisetum as a biofuel on saline land in the Northern of the China.
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