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Acta Prataculturae Sinica ›› 2011, Vol. 20 ›› Issue (4): 98-107.

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Seasonal changes of freezing tolerance and its relationship to the contents of carbohydrates, proline, and soluble protein of Zoysia

WANG Dan, XUAN Ji-ping, GUO Hai-lin, LIU Jian-xiu   

  1. Institute of Botany, Jiangsu Province & Chinese Academy of Sciences, Nanjing 210014, China
  • Received:2010-05-18 Online:2011-04-25 Published:2011-08-20

Abstract: To clarify the changes of carbohydrates, proline, soluble protein contents and their relationships to freezing tolerance of Zoysia japonica ‘Lanyin No.3’, the relationship of carbohydrate (total soluble sugars, sucrose, glucose, starch), proline and soluble protein concentrations with LT50(the lethal temperature killing 50% of the plants) of rhizomes were studied at monthy intervals from October, 2008 to May, 2009 under natural cold conditions. The contents of carbohydrates, proline, soluble protein and LT50 showed a clear seasonal trend in rhizomes of Z. japonica ‘Lanyin No.3’ and they increased or decreased sharply as temperatures dropped in overwintering and decreased or increased gradually along with the rise in temperature in spring. Correlation analysis revealed that the freezing tolerance of rhizomes of Z. japonica ‘Lanyin No.3’ positively correlated with the contents of total soluble sugars, glucose and the ratio of the soluble sugars to starch but had no positive correlation with the contents of sucrose, starch, and proline.

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