分蘖期旱涝交替胁迫对水稻生理指标的影响

采用盆栽试验,以常规灌溉为对照(CK),研究了水稻在分蘖期轻度旱涝交替胁迫(T-LD)和重度旱涝交替胁迫(T-HD)前、后及复水后各个生育期的部分生理指标变化,以探讨旱涝交替胁迫对水稻生长影响的机理。结果表明,T-LD处理的水稻叶片硝酸还原酶(NR)活性显著高于T-HD处理和CK;与CK相比,旱涝交替胁迫处理显著降低了水稻叶片中丙二醛(MDA)的质量摩尔浓度和谷氨酰胺合成酶(GS)活性,显著增加了水稻叶片中叶绿素总量;复水后(黄熟期)GS活性均明显提高并高于CK。说明分蘖期旱涝交替胁迫可以增强水稻叶片的生理活性,延缓叶片衰老,不会降低水稻后期的耐淹能力。

Impact of Alternating Drought and Waterlogging during Tillering Stage on Physiological Traits of Rice

This paper investigated the impact of alternating waterlogging and drought during the tillering stage on physiological traits of rice using pot experiments.We considered both slight watedogging-drought alternation (TLD) and severe waterlogging-drought alternation (T-HD).Main physiological traits were measured before,during and after occurrence of these stresses.The results showed that the activity of nitrate reductase in the leaves under T-LD was higher than those under T-HD and CK (conventional flooding).In comparison with those under CK,the concentration of malondialdehyde and the activity of glutamine synthetase (GS) under T-LD and T-HD decreased significantly,while the concentration of chlorophyll increased.At ripening stage after re-watering,the activity of GS increased considerably and was higher than that under the CK,indicating that a moderate waterlogging-drought alternation during tillering stage can enhance physiological activity of the rice and delayed senescence without scarifying tolerance of the rice to flooding.