低温驯化阶段不同抗寒性冬小麦品种生理代谢的比较

为分析寒地冬小麦越冬性的生理基础,比较低温胁迫下东农冬麦1号(强抗寒)和济麦22(弱抗寒)两个品种小麦幼苗的鲜重、干重、相对含水量及其叶片和分蘖节的电导率和脯氨酸含量变化。结果表明,低温驯化阶段东农冬麦1号干物重显著高于济麦22,气温低于0℃时,东农冬麦1号干重仍增加,而济麦22则降低。济麦22相对含水量显著高于东农冬麦1号,10月29日(-2℃/7℃)东农冬麦1号植株的相对含水量迅速降低,而济麦22植株的相对含水量在11月2日(-3℃/5℃)迅速降低。两个品种分蘖节的脯氨酸含量显著高于叶片的脯氨酸含量,东农冬麦1号分蘖节的脯氨酸含量高于济麦22分蘖节的脯氨酸含量。低温胁迫下济麦22叶片的相对电导率高于东农冬麦1号。

Comparison of physiological metabolism of different cold resistance cultivars during cold acclimation period

The changes of the fresh weight, dry weight, relative water content, electrical conductivity and the content of praline between the two cultivars Dongnong Dongma1 and Jimai22 during the cold acclimation period were compared to analyze the physiological basis in winter hardiness of winter wheat. The results showed that the dry weight of Dongnong Dongmaii was higher than that of Jimai22 during the cold acclimation period, when the temperature was lower than 0 °C, the dry weight of Dongnong Dongmaii still increased, but Jimai22 decreased. The relative water content of Jimai22 higher than that of Dongnong Dongma1, the relative water content of Dongnong Dongma1 decreased rapidly at October 29, and the relative water content of Jimai22 decreased rapidly at November 2. The content of proline in tiller nods of Dongnong Dongma1 was higher than that of Jimai22. The relative electrical conductivity of Jimai22 was higher than that of Dongnong Dongma1 during cold acclimation period.