A pot experiment was conducted, using two rice cultivars Ningjing 1 (TCB sensitive) and Yangfujing 8 (TCB tolerant), with five concentration treatments (0, 10, 20, 40, and 80 mg TCB per kg dry soil) to explore the responses of two rice cultivars to TCB, and provide the basis for the high, stable, and safe production of rice. The results indicated that significant differences were found in the effects of TCB treatments on grain yield and photosynthetic parameters of flag leaf between the two cultivars. Plant height, fresh weight, and yield were significantly increased, chlorophyll content, net photosynthetic rate, intercellular CO2 con- centration, transpiration rate, and qN were slightly increased, while Fv/Fm and Fv/Fo were slightly decreased in the low TCB con- centration (10 mg kg -1 ) treatment of Yangfujing 8. Under the same condition, the net photosynthetic rate, CO2 intercellular con- centration, transpiration rate, ΦPSII, Fv/Fm, Fv/Fo, qp, yield in Ningjing 1 were slightly declined with significant reduction of stomatal conductance. The photosynthetic characteristics, yield, plant height, fresh weight in Ningjing 1 were decreased signifi- cantly, while Yangfujing 8 showed more resistance and adaptation to TCB at 20 mg kg -1 . Both cultivars showed significant de- crease in growth, photosynthesis and yield in treatments with high TCB concentrations (40 and 80 mg kg -1 ), with the greater dec- rements in Ningjing 1. The effect of TCB on photosynthetic characteristics and yield of rice was not only related to TCB concen- tration, but also to cultivars. Low TCB levels slightly promoted the plant height, fresh weight, chlorophyll content, photosynthetic

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。

以耐受基因型扬辐粳8号和敏感基因型宁粳1号为供试材料,采用盆栽试验研究1,2,4-三氯苯（1,2,4-TCB）胁迫对不同耐受性水稻品种产量及其构成因素、1,2,4-TCB含量及其在水稻植株中分配的影响。结果表明:1,2,4-TCB胁迫显著降低宁粳1号的产量、有效穗数、每穗粒数和结实率,低浓度1,2,4-TCB对扬辐粳8号产量及其构成因素影响不显著,中高浓度则显著影响。水稻各器官1,2,4-TCB含量由高至低依次为根、茎、叶、籽粒,说明水稻吸收的1,2,4-TCB主要积累在根系中,敏感基因型宁粳1号吸收和积累1,2,4-TCB的能力高于耐受基因型扬辐粳8号,在实际生产中要选择耐受性品种,以此降低稻米受1,2,4-TCB污染的风险。