冷害胁迫是造成水稻减产的重要因素。为探讨不同水稻品种的抗冷性,以吉林省25个主栽品种为材料,测定分析了在冷害胁迫条件下这些品种的脯氨酸、丙二醛、叶绿素及可溶性糖含量的变化情况。结果表明,所有参试水稻品种在冷害胁迫下其游离氨基酸含量升高,丙二醛含量显著增加;吉粳515、通禾66及秋田小町脯氨酸积累较多;与常温条件下相比,吉粳809、吉宏9和通禾66的叶绿素含量冷害胁迫下变化不是很显著,生长较好,耐冷性较为突出;吉粳515 、吉农大538和吉农大853在冷害胁迫条件下积累了更多的可溶性糖,进而提高了抗逆性;吉香6、宏科88抗冷性较弱,在栽培过程中,应注意对低温冷害的防御。

Cold stress is an important factor to reducing rice yield. In order to explore the cold resistance of different rice varieties, 25 main varieties of Jilin Province were used as materials to determine and analyze the changes in the contents of proline, malondialdehyde, chlorophyll and soluble sugars under cold stress conditions. The results showed that the free amino acid content and malondialdehyde content of all tested rice varieties increased significantly under cold stress. Jigeng 515, Tonghe 66 and Akita Komachi accumulated more proline. The chlorophyll content of Jigeng 809, Jihong 9 and Tonghe 66 did not change significantly under cold stress compared with that under normal temperature conditions, and the growth was better, and the cold tolerance was more prominent. Jigeng 515, Jinongda 538 and Jinongda 853 accumulated more soluble sugar under cold stress, thus improving cold resistance. Jixiang 6, Hongke 88 was weak in cold resistance, so it was necessary to pay attention to the prevention of cold damage in the cultivation process.