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饲料氮素水平对亚洲玉米螟食物利用及营养指标的影响
Effects of nitrogen on food utilization by, and nutritional content of, the Asian corn borer
丁新华,袁 洁,付开赟,袁梓涵,王小武,贾尊尊,阿尔孜姑丽·肉孜,吐尔逊·阿合买提,郭文超
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DOI:10.7679/j.issn.2095-1353.2023.019
作者单位:新疆农业科学院植物保护研究所,农业农村部西北荒漠绿洲作物有害生物综合治理重点实验室,乌鲁木齐830091
中文关键词:亚洲玉米螟;氮素;食物利用;营养指标
英文关键词:Asian corn borer; nitrogen; food utilization; nutritional indicators
中文摘要:

【目的】 研究不同氮素含量的人工饲料对亚洲玉米螟Ostrinia furnacalis (Guenée)食物利用及营养指标的具体影响,以期揭示玉米螟种群激增的内在氮素营养驱动机制。【方法】 实验室条件下,设置N1(3.94%)、N2(7.33%)、N3(10.69%)、N4(18.84%)和N5(30.31%)5个氮素含量的人工饲料饲喂亚洲玉米螟3龄、4龄和5龄幼虫,比较分析幼虫的食物利用和营养指标的差异。【结果】 亚洲玉米螟3龄幼虫取食中氮N3(10.69%)饲料时,食物利用率和食物转化率最高,分别为16.28%±0.89%和41.05%±4.07%,显著大于N4和N5两个高氮处理组,且低氮处理组N2的食物利用率和食物转化率最低,分别为3.32%±0.57%和2.36%±0.69%。4龄幼虫取食高氮N5处理组饲料的食物利用率最高,为22.13%±1.51%;5龄幼虫取食高氮N5和N4后的食物利用率和近似消化率最大,分别为24.29%±7.01%和40.93%±2.94%,而食物转化率和相对增长率均随氮素含量变化差异无显著(P>0.05);氮利用率方面,3龄、4龄和5龄幼虫均随着食物氮素水平的增加而增大,且取食N5高氮处理组的幼虫对氮利用率达到最大,分别为72.33%、86.09%和90.91%。【结论】 饲料中不同氮素含量对亚洲玉米螟幼虫食物利用及自身营养指标的影响显著,随食物氮素含量的增加显著提高4龄和5龄幼虫的食物利用率、相对取食率和氮利用率。

英文摘要:

[Objectives]  To determine the role of nitrogen in the population explosion of the Asian corn borer, Ostrinia furnacalis (Guenée), we compared the effects of artificial diets with different nitrogen contents on food utilization by, and nutritional content of, this species. [Methods]  Five artificial diets (N1, N2, N3, N4 and N5) with nitrogen contents of 3.94%, 7.33%, 10.69%, 18.84% and 30.31% were fed to 3rd, 4th and 5th-instar larvae, and differences in food utilization and larval nutritional indices between treatment groups were compared and analyzed. [Results]  The highest food utilization rate (16.28% ± 0.89%) and food conversion rate (41.05% ± 4.07%) was recorded in 3rd instar larvae in the  N3 treatment group, significantly higher than the corresponding values in the N4 and N5 treatment groups. The lowest food utilization and food conversion rate, 3.32% ± 0.57% and 2.36% ± 0.69%, respectively, were recorded in the N2 treatment group. The highest food utilization rate in 4th instar larvae, 22.13% ± 1.51%, was recorded in the N5 treatment group. 5th instar larvae in the N5 and N4 treatment groups had the highest food utilization and approximate digestibility; 24.29% ± 7.01% and 40.93% ± 2.94%, respectively, but dietary nitrogen had no significant effect on food conversion and relative growth rates (P > 0.05). The nitrogen use efficiency of 3rd, 4th and 5th-instar larvae all increased with dietary nitrogen content; the highest nitrogen use efficiencies for each instar (72.33%, 86.09% and 90.91%, respectively) were all recorded in the N5 treatment group. [Conclusion]  Dietary nitrogen has a direct impact on food utilization by, and the nutritional indices of, Asian corn borer larvae, and dietary nitrogen significantly increased food use efficiency, relative feeding rate and nitrogen use efficiency of 4th- instar and 5th-instar larvae.

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