Liu Yan-Hong, Kang Zhi-Wei, Guo Ya, Zhu Guo-Shuai, Shah M Mostafizur Rahman, Song Yue, Fan Yong-Liang, Jing Xiangfeng, Liu Tong-Xian
State Key Laboratory of Crop Stress Biology for Arid Areas, and Key Laboratory of Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi, 712100 China.
Sci Rep. 2016 Apr 20;6:24781. doi: 10.1038/srep24781.
Low proportion of essential amino acids (EAAs) is one of the barriers for animals to use phloem as a diet. Endosymbionts with EAAs synthesis functions are considered crucial for ameliorating the lack of EAAs in insects' diets. In this study, we transferred the insects from a cabbage-reared Myzus persicae population onto 3 new plant species including eggplant, tobacco and spinach. The performance on these plants was evaluated and the dynamics of endosymbionts in relation to this host alternation were recorded. We found that the EAAs ratio in phloem was largely determined by the concentrations of non-essential amino acids and the higher proportion of EAAs seemed to favor the population establishment on new plant species and the growth of primary endosymbionts inside insects, which indicated that nitrogen quality was an important factor for aphids to infest and spread on new plant hosts.
必需氨基酸（EAA）比例低是动物将韧皮部作为食物来源的障碍之一。具有EAA合成功能的内共生体被认为对于改善昆虫饮食中EAA的缺乏至关重要。在本研究中，我们将以甘蓝为食的桃蚜种群转移到包括茄子、烟草和菠菜在内的3种新植物上。评估了这些植物上的表现，并记录了内共生体与这种寄主交替相关的动态变化。我们发现，韧皮部中EAA的比例在很大程度上由非必需氨基酸的浓度决定，较高比例的EAA似乎有利于在新植物物种上的种群建立以及昆虫体内初级内共生体的生长，这表明氮质量是蚜虫侵染和在新植物寄主上传播的一个重要因素。
