论文部分内容阅读
利用沙培试验,研究了6种浓度(0、0.1、0.2、0.4、0.6和0.8 mmol·kg~(-1))的1,2,4-三氯苯(TCB)对2种基因型水稻‘香粳20~(-1)8’(耐性基因型)和‘泗阳1382’(敏感基因型)苗期叶绿素含量、叶绿素荧光参数等指标的影响。结果表明,在中低浓度(0.1~0.4 mmol·kg~(-1))1,2,4-TCB胁迫下,相同浓度的‘香粳20~(-1)8’表现为叶绿素a含量、叶绿素b含量和叶绿素总含量显著高于‘泗阳1382’,说明其比‘泗阳1382’更耐1,2,4-TCB胁迫。‘泗阳1382’的叶绿素荧光参数PSII最大光化学效率(F_v/F_m)、PSII潜在光化学效率(F_v/F_o)、光化学猝灭系数(qP)和表观光合电子传递速率(ETR)与1,2,4-TCB浓度之间存在显著或极显著的相关关系,可以作为表征敏感基因型水稻受1,2,4-TCB胁迫伤害程度的参考指标。‘香粳20~(-1)8’叶绿素荧光参数与叶绿素含量之间极显著或显著的相关性明显多于‘泗阳1382’,也说明耐性基因型‘香粳20~(-1)8’叶片的PSII反应中心结构受到1,2,4-TCB胁迫的损伤程度要小于敏感基因型‘泗阳1382’。
Using sand culture experiments, the effects of 1,2,4-trichlorobenzene (TCB) with 6 concentrations (0, 0.1, 0.2, 0.4, 0.6 and 0.8 mmol · kg -1) on two genotypes of rice ’Xiangjing 20’ (-1) 8 ’(resistant genotype) and’ Siyang 1382 ’(sensitive genotype) seedlings chlorophyll content, chlorophyll fluorescence parameters and other indicators. The results showed that the same concentration of ’Xiangjing 20’ (-1) 8 ’exhibited chlorophyll a content under medium and low concentrations (0.1-0.4 mmol · kg -1) of 1,2,4-TCB, Chlorophyll b content and total chlorophyll content were significantly higher than ’Siyang 1382’, indicating that it was more resistant to Siyang 1382 than 1,2,4-TCB stress. The chlorophyll fluorescence parameter PSII maximum photochemical efficiency (F_v / F_m), PSII potential photochemical efficiency (F_v / F_o), photochemical quenching coefficient (qP) and photosynthetic electron transfer rate (ETR) , And 4-TCB concentration, which could be used as a reference index to characterize the damage degree of sensitive genotype rice to 1,2,4-TCB stress. There was a significant or significant correlation between the chlorophyll fluorescence parameters and the chlorophyll fluorescence parameters of Xiangjing 20 ~ (-1) 8 ’than that of’ Siyang 1382 ’, and also showed that the tolerance genotype’ Xiangjing 20 ~ (-1) 8 The damage of PSII reaction center structure to leaves under 1,2,4-TCB stress was less than that of the sensitive genotype ’Siyang 1382’.