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以2个耐热性不同的水稻品系N5和特青(TQ)为材料,在苗期对室内盆栽的2.1叶龄的水稻幼苗进行7 d的40℃高温处理,并测定水稻幼苗株高、干重、叶色、脯氨酸、丙二醛含量及电导率等指标。结果表明,高温处理促进了耐热水稻N5的幼苗生长,表现为株高、根长以及地上部干重显著增加。高温处理抑制了TQ的幼苗生长,尤其是对株高的抑制作用最大。高温处理增加了N5的叶绿素含量,对N5的PSII活性没有影响,对N5的膜系统损害也不明显。而高温处理降低了TQ的PSII活性,并导致TQ的膜系统受到严重损害。推测两者耐性的差异之一在于活性氧自由基的生产量或清除能力上。
Two 2.1-year-old potted rice seedlings were treated with 40 ℃ for 7 days at the seedling stage, and the plant height and dry weight of the rice seedlings were determined by using two heat-resistant rice lines N5 and Teqing (TQ) Heavy, leaf color, proline, malondialdehyde content and conductivity and other indicators. The results showed that high temperature treatment promoted the seedling growth of heat-resistant rice N5, which showed that plant height, root length and shoot dry weight increased significantly. High temperature treatment inhibited the growth of TQ seedlings, especially the inhibition of plant height. High temperature treatment increased the chlorophyll content of N5, had no effect on the PSII activity of N5, and did not significantly damage the N5 membrane system. However, hyperthermia reduced the PSII activity of TQ and resulted in severe damage to the TQ membrane system. It is speculated that one of the differences between the two tolerance is the production of reactive oxygen species or scavenging capacity.