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^: 06-12113 2012 N 4
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^: . . . . . . - , 2012; N 4. - . 15-16
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^: 15 . 9 13 %. . - . - (, 50) 16 21 %. ( 380, 808) 69-88 %. (, ). - 1,3-1,5, 6,6-7,3. - . - - ( -10-12° 4 2 ). 20%, 80% . .

aref2 The research objects were 15 wheat varieties from different ecological areas. The proline content in seed-lings of plants before freezing was not great, it varied with varieties from 9 to 13 mg%. After freezing this value changed considerably. There was observed a slight increase of proline in the seedlings of varieties in response to freezing. Varieties with low levels of frost-resistance (Santa, Konkurent and Pobeda 50) contained 16-21 mg% proline. At the same time, proline content increased to 69-88 mg% at the frost-resistant varieties of winter wheat (Bezenchukskaya 380, Ulyanovka and Mironovskaya 808). Accordingly, the proline index changed as well (the ratio of proline content in seedlings after freezing to the initial value). The proline index of varieties with a low frost-resistance was 1.3-1.5, it has increased to 6.6-7.3 at frost-resistant varieties. The proline index can be used for a comparative evaluation of genotypes for resistance to low temperatures. Objective assessment of frost resistance using proline index is confirmed by experiments with freezing in the refrigerator (gradually lowering the temperature to 10-12 degrees C. for 4 days and holding for other 2 days). In the varieties having a low proline index the survivability after freezing was not above 20%, and in the varieties having a high proline index it reached 80% and higher. The new method is proposed to be used for evaluation of the frost resistance of new varieties and selection samples of winter wheat.

^TRN: 1285826
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