Open Access

ARTICLE

Morphological differences of vessels in the secondary xylem of columnar and standard apple trees

Zhang YG, SX Guo, HY Dai

College of Landscaping and Horticulture, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China.

Address correspondence to: Zhang Yugang: e-mail: ; Dai Hongyi: e-mail: