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Phospholipase A 2 Activity during Cold Acclimation of Wheat
Author(s) -
Skinner Daniel Z.
Publication year - 2009
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2008.06.0359
Subject(s) - acclimatization , biology , zoology , cold tolerance , winter wheat , botany , horticulture , agronomy
The temperature lethal to 50% of the plants (LT 50 ) and phospholipase A 2 (PLA 2 ) activity levels were investigated in three wheat ( Triticum aestivum L.) lines that had been cold acclimated 0 to 5 wks at 3°C. In the cold‐tolerant winter wheat ‘Eltan’, the level of PLA 2 activity increased significantly during the first week of cold acclimation, but activity did not increase until the second week of acclimation in cold‐sensitive winter wheat Oregon Feed Wheat #5 and spring wheat ‘Louise’. The PLA 2 activity declined in all lines by the end of 4 wks of acclimation. The LT 50 decreased (greater freezing tolerance) during the time that PLA 2 levels were elevated and then increased concomitant with decreased PLA 2 activity. A chilling treatment of −5°C for 45 min resulted in elevated PLA 2 activity in nonacclimated Eltan, as well as in all three wheat lines that had been acclimated for 1 wk, but not in plants that had been acclimated for more than 1 wk. These results suggest that PLA 2 activity is involved in response to cold temperature in wheat, but the intrinsic level of freezing tolerance and the level of acclimation reached by the plants mediates its activity.