作物学报 ›› 2014, Vol. 40 ›› Issue (03): 487-496.doi: 10.3724/SP.J.1006.2014.00487
丁秀文1,2,4,张国良2,3,*,戴其根1,*,朱青2
DING Xiu-Wen1,2,4,ZHANG Guo-Liang2,3,*,DAI Qi-Gen1,*,ZHU Qing2
摘要:
在土培条件下,以对1,2,4-三氯苯(TCB)敏感性显著差异的宁粳1号(敏感)和扬辐粳8号(耐性)为对象,研究了不同浓度1,2,4-三氯苯(TCB)胁迫对两种水稻分蘖盛期生长和生理特性的影响。结果表明,不同浓度TCB胁迫下,敏感基因型宁粳1号最长根长、株高、单穴分蘖数、地上部和地下部干物重随胁迫程度加深均显著递减; 耐性基因型扬辐粳8号在低浓度(20 mg kg-1) TCB胁迫下,最长根长、地上部和地下部干物重极显著增加,当中高浓度(40 mg kg-1、60 mg kg-1) TCB胁迫时,最长根长、株高、单穴分蘖数、地上部和地下部干物重显著下降。不同浓度TCB胁迫下,敏感基因型宁粳1号根系活力、叶绿素含量、叶片和根系可溶性蛋白质含量相对较低,叶片和根系超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性明显降低,O2?产生速率和丙二醛(MDA)含量显著增高; 耐性基因型扬辐粳8号在低浓度(20 mg kg-1) TCB胁迫下,根系活力、叶片和根系的可溶性蛋白含量、SOD、POD、CAT活性极显著增加,O2?产生速率和MDA含量极显著降低,当中等浓度(40 mg kg-1) TCB胁迫时,SOD、POD、CAT活性虽然增强,但O2?产生速率显著增加,MDA大量积累,当高浓度(60 mg kg-1) TCB胁迫时,其根系活力、叶绿素含量极显著降低,根系中SOD、CAT活性显著降低,O2?产生速率和MDA含量显著增加。总之,低浓度TCB胁迫下,长势良好、叶片和根系可溶性蛋白质含量高、抗氧化系统清除活性氧能力强、膜脂过氧化程度低是耐性基因型扬辐粳8号区别于敏感型宁粳1号的主要特征。
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