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在盆栽土培条件下,研究了5种浓度(0、10、20、40、80 mg/kg土)的1,2,4-三氯苯(TCB)对两种基因型水稻品种宁粳1号(敏感基因型)和扬辐粳8号(耐性基因型)产量及灌浆期生理特性的影响。结果表明:TCB对两种基因型水稻产量和灌浆期生理特性的影响具有显著差异,随着TCB浓度的增加,宁粳1号的产量呈现递减趋势,而扬辐粳8号呈低浓度下产量增加高浓度下产量显著降低的趋势,在中高浓度TCB(40、80 mg/kg)处理时,宁粳1号每盆穗数,每穗粒数,结实率显著降低且降幅显著大于扬辐粳8号,两个基因型品种千粒重变化都不明显。宁粳1号株高、干物重受TCB抑制程度较明显,降幅显著大于扬辐粳8号。在低浓度TCB(20 mg/kg)处理时,宁粳1号根系活力、叶绿素含量、可溶性蛋白质含量显著降低,而扬辐粳8号有所提高。随着TCB浓度的增加,两个基因型品种叶片抗氧化酶SOD、POD、CAT活性均呈先升后降趋势,且在低浓度TCB(10 mg/kg、20mg/kg)处理时,扬辐粳8号抗氧化酶活性极显著高于宁粳1号,在高浓度TCB(80 mg/kg)TCB浓度胁迫下,宁粳1号抗氧化酶活性极显著低于对照,且降幅极显著大于扬辐粳8号,且MDA含量增幅较大,膜质过氧化程度高。总体而言,低浓度TCB对扬辐粳8号的产量和灌浆期株高、干物重、叶绿素含量、叶片蛋白质含量和抗氧化酶活性具有一定的促进作用,中高浓度TCB对宁粳1号的抑制作用显著大于扬辐粳8号,扬辐粳8号在不同浓度的TCB处理下较宁粳1号表现出较强的耐迫性和适应性。
Under the condition of pot culture, the effects of 1,2,4-trichlorobenzene (TCB) at 5 concentrations (0, 10, 20, 40 and 80 mg / kg soil) (Sensitive genotype) and Yangfujing 8 (tolerant genotype) yield and physiological characteristics at grain filling stage. The results showed that the effects of TCB on the physiological characteristics of two genotypes of rice at grain filling stage were significantly different. With the increase of TCB concentration, the yield of Ningjing 1 showed a decreasing trend, while the yield of Yangfujing 8 at low concentration The yield of Ningjing 1 per pot per panicle, grain number per panicle and seed setting rate significantly decreased and the decline rate was significantly higher than that of Yangfujing when treated with medium and high concentration of TCB (40 and 80 mg / kg) On the 8th, the change of 1000-grain weight of two genotypes was not obvious. The plant height and dry weight of Ningjing 1 were more significantly inhibited by TCB, with a significant decrease more than that of Yangfujing 8. When treated with low concentration of TCB (20 mg / kg), root activity, chlorophyll content and soluble protein content of Ningjing 1 decreased significantly, while Yangfujing 8 increased. With the increase of TCB concentration, the activities of SOD, POD and CAT in leaves of two genotypes increased first and then decreased, and at the low TCB treatment (10 mg / kg, 20 mg / kg) The antioxidant enzyme activity of japonica 8 was significantly higher than that of Ningjing 1. Under the TCB concentration of high concentration TCB (80 mg / kg), the activity of antioxidant enzyme of Ningjing 1 was significantly lower than that of the control YangFenJing 8, and a greater increase in MDA content, high degree of membrane peroxidation. Overall, TCB at low concentrations promoted the plant height, dry matter weight, chlorophyll content, leaf protein content and antioxidant enzyme activity of Yangfujing 8 during grain filling. The inhibition was significantly greater than that of Yangfujing 8 and Yangfujing 8, which showed stronger tolerance and adaptability than Ningjing 1 under different concentrations of TCB treatment.