干旱胁迫条件下小麦抗寒性变化规律研究（英文）

Study on Change Laws of Cold Tolerance in Wheat under Drought Stress

为了研究小麦在干旱胁迫时抗寒性的变化规律,选取黄淮麦区南片小麦品种11个;长江中下游麦区小麦品种1个,研究其在正常水分条件下以及干旱胁迫条件下抗寒性变化规律。结果表明:在干旱条件下,小麦在各生育期抗寒性较非干旱条件下均明显降低,越冬期减幅最大,平均为4.91℃,返青期最小,拔节期居中。在非干旱条件下,各生育期,半冬性品种的抗寒性较春性品种均具有一定的优势,品种间抗寒性差异明显,所有品种在越冬期的抗寒性较冬前均有所提升,越冬后抗寒性迅速下降。半冬性品种越冬期抗寒性增强明显,春性品种抗寒性也有一定提高。

In order to study the change laws of cold tolerance in wheat under drought stress, 11 wheat varieties planted in Huang-Huai wheat area and one variety representative in middle-lower Yangtze River wheat area were selected, and the their change laws of cold tolerance under normal moisture condition and drought stress condition. The results showed that under drought condition, the cold tolerance of wheat in various growth stages was remarkably lower than that under nondrought condition, and the decreasing amplitudes were the largest in overwintering stage with an average of 4.91 ℃, the smallest in regreening stage, and in the middle in the jointing stage. Under non-drought condition, the cold tolerance of semi- winter varieties in various growth stages was better than that of spring varieties, there were significant differences between different varieties, and the cold tolerance of all varieties in overwintering stage was improved compared with before winter, and rapidly decreased after overwintering. Semiwinter varieties showed cold tolerance remarkably enhanced in overwintering stage, and the cold tolerance of spring varieties was also improved to a certain degree.