Host specificity of plant‐associated bacteria is negatively associated with genome size and host abundance along a latitudinal gradientZihui Wang, Geneviève Lajoie, Yuan Jiang, Minhua Zhang, Chengjin Chu, Yongfa Chen, Shuai Fang, Guangze Jin, Mingxi Jiang, Juyu Lian, Yanpeng Li, Yu Liu, Keping Ma, Xiangcheng Mi, Xiujuan Qiao, Xihua Wang, Xugao Wang, Han Xu, Wanhui Ye, Li Zhu, Yan Zhu, Fangliang He, Steven W. Kembel