| 寇江涛1, 2; 师尚礼1, 2*; 胡桂馨1, 2.牛角花齿蓟马为害对紫花苜蓿生长及氮代谢的影响[J].植物保护,2014,40(4):14-20. |
| 牛角花齿蓟马为害对紫花苜蓿生长及氮代谢的影响 |
| Effects of Odontothrips loti damage on alfalfa growth and nitrogen metabolism |
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| DOI： |
| 中文关键词: 紫花苜蓿 牛角花齿蓟马 受害指数 单株生物量 氮代谢 |
| 英文关键词:alfalfa Odontothripsloti damageindex individualindex nitrogenmetabolism |
| 基金项目:国家现代牧草产业技术体系建设专项（CARA-35）; 全国种质资源保种项目（NB2130135）; 教育部高校博士学科点基金（20106202110003）; 农业部（农业）行业专项（201003023）; 国家自然科学基金项目（31260579） |
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| 中文摘要: |
| 为了明确牛角花齿蓟马为害对紫花苜蓿生长及氮代谢的影响，测定了不同牛角花齿蓟马虫口密度下抗、感蓟马苜蓿无性系R-1、I-1的受害指数、单株生物量及氮代谢的变化。结果表明：（1）随着牛角花齿蓟马虫口密度的增加，R-1、I-1无性系各接虫处理的受害指数均升高、单株生物量均下降，在相同牛角花齿蓟马虫口密度下，R-1无性系的受害指数及产量损失率均低于I-1无性系。（2）受牛角花齿蓟马为害后，R-1无性系各接虫处理硝酸还原酶活性上升后趋于稳定，硝态氮含量呈先上升后下降的趋势，游离氨基酸含量呈持续上升的趋势; I-1无性系各接虫处理的硝酸还原酶活性呈先上升后下降的趋势，硝态氮含量呈先下降后上升的趋势，游离氨基酸含量上升后趋于稳定或下降。结果说明：硝酸还原酶活性的升高是R-1无性系对蓟马诱导抗性的一种表现，而I-1无性系氮代谢失调是其感蓟马的主要原因之一，因此R-1无性系的适应能力强，受害较轻，对牛角花齿蓟马为害的抗性和补偿生长能力高于I-1无性系。 |
| 英文摘要: |
| Damage index, individual biomass and nitrogen metabolism were investigated on alfalfa clones R-1 and I-1, resistant and susceptible to Odontothrips loti, respectively, under different pest densities to determine the effects of O. loti damage on alfalfa growth and nitrogen metabolism. The results indicated that: (1) all damage indices of both R-1 and I-1 increased and individual biomasses decreased as pest density increased, and at the same density level, damage index and yield loss of R-1 were lower than those of I-1; (2) after being damaged by thrips, NR (nitrate reductase) activity of all inoculated R-1 increased till stabilization, and nitrate nitrogen content firstly increased and then decreased, and free amino acids increased continuously; NR activity of all inoculated I-1 firstly increased and then decreased, while nitrate nitrogen content decreased firstly, followed by increase; free amino acid content firstly increased, then remained stable or decreased. These results indicated that the increase of NR activity was a manifestation of induced resistance of R-1 to thrips, while nitrogen disorder of I-1 is the main reason leading to their susceptibility, all of which ultimately resulted in stronger adaptability and minor damage of R-1, as well as stronger resistance and compensation growth capability than I-1. |
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