【摘要】 为了探究水稻生育后期温度变化对水稻产量、镉转运积累的影响，本研究以吸镉能力差异较大的3个常规晚稻品种(v1、v2、v3)为试材，于2023年在湖南省水稻研究所人工气候室内采用盆栽方式，设置2个温度条件即对照CK (昼30℃/夜20℃)和增温处理(昼35℃/夜25℃),研究齐穗期至成熟期增温对水稻产量性状和植株各部位镉含量、积累转运的影响。结果表明，增温处理显著降低v1、v2、v3产量，分别较其CK降低35.3%、33.1%、22.2%,均降低结实率、千粒重及穗粒数。增温促进3个品种成熟期根、茎叶的镉吸收，根镉含量分别较其CK升高177.0%、119.5%、142.3%且处理间差异达到显著水平，v1、v3茎叶镉含量分别较其CK升高131.7%、75.5%且均差异显著；增温抑制镉向籽粒的转运积累，在茎叶-糙米镉转运中，v1和v3转运系数较其CK分别降低78.4%、57.1%;3个品种增温条件下糙米镉积累量较其CK均显著下降，分别降低67.5%、21.7%、32.4%。增温时水稻剑叶丙二醛(MDA)、非蛋白巯基(NPT)、谷胱苷肽(GSH)、植物络合素(Pcs)含量均显著提高，并降低光合产物的合成及转运。综上，增温促进水稻根系对镉的吸收及向茎叶中转运，对水稻光合产物的合成及运输起到抑制作用，进而降低产量和糙米镉含量。更多还原

【Abstract】 In order to explore the impact of temperature changes in later growth period of rice on yield and cadmium transportation and accumulation, three conventional late rice varieties(v1, v2, v3) with different cadmium absorption capacity were used as materials, and the pot experiment was conducted in the artificial climate room of the Rice Institute of Hunan Province in 2023 by setting two temperature treatments as control(CK,day 30 ℃/night 20 ℃) and temperature increase treatment(day 35 ℃/night 25 ℃). The impact of temperature increase from full heading period to mature period on yield traits and cadmium content, accumulation and transportation of rice were studied. The results showed that temperature increase significantly reduced the yield of v1, v2 and v3 by 35.3%, 33.1% and 22.2%, respectively compared with their CK, and reduced the seed rate, 1 000-grain weight and kernel number per ear. Temperature increase promoted the cadmium absorption in roots, stems and leaves of the three varieties during mature period. The cadmium content in roots increased by 177.0%, 119.5% and 142.3% compared with their CK, respectively, which were up to significant level. The cadmium content in stems and leaves of v1 and v3 increased by 131.7% and 75.5% compared with their CK, and reached significant level. Temperature increase inhibited the accumulation of cadmium into grains. The transfer coefficient of cadmium from stems and leaves to brown rice decreased by 78.4% and 57.1% in v1 and v3 compared with their CK. Cadmium accumulation in brown rice of the three varieties decreased by 67.5%, 21.7% and 32.4%, respectively. During temperature increase, the contents of malondialdehyde(MDA), non-protein thiols(NPT), glutathione(GSH), and phytochelatins(Pcs)in rice flag leaves were significantly improved, and the synthesis and transportation of photosynthetic products were reduced. In summary, temperature increase promoted the cadmium absorption of roots and its transportation to stems and leaves, which inhibited the synthesis and transportation of photosynthates in rice, thereby reduced the yield and cadmium contentin brown rice.更多还原