title: [Root architecture and phosphorus efficiency of different provenance Pinus massoniana under low phosphorous stress].
abstract: Taking four representative provenances of Pinus massoniana from Chun' an of Zhejiang, Wuping of Fujian, Cenxi of Guangxi, and Xinyi of Guangdong in East and South China as test materials, a pot experiment was conducted to study their variations in root architecture and phosphorus (P) efficiency under heterogeneous and homogeneous low P stress. Large variations were detected in the major growth traits and the indices of P efficiency among the P. massoniana provenances under both heterogeneous and homogeneous low P stress. Under heterogeneous low P stress, the provenances from Xinyi of Guangdong and Wuping of Fujian exhibited higher P efficiency and greater dry matter accumulation, and their root architecture presented large adaptive changes, with the values of root parameters in P-rich soil surface layer being significantly higher than those of the P inefficient provenances from Chun'an of Zhejiang and Cenxi of Guangxi, which should be responsible for the higher P absorption efficiency and high P efficiency of the provenances from Xinyi and Wuping under heterogeneous low P condition. The root architecture parameters in P-rich soil surface layer and the plant dry matter accumulation of different provenance P. massoniana under heterogeneous low P stress had a correlation coefficient >0.95. Under homogeneous low P stress, the provenances with higher P efficiency had a significantly higher P uptake efficiency than the provenances with lower P efficiency, but the root parametres of the provenances with higher P efficiency had no significant correlation with the P efficiency of the provenances. There existed differences in the adaptive mechanism for the heterogeneous and homogeneous low P stress among the the P. massoniana provenances, and thus, different strategies should be adopted in the selection of P-efficient provenances for different forest stands.
authors.affiliation: Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China. yqing1999@163.com
authors.forename: Qing
authors.initials: Q
authors.lastname: Yang
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Zhi-Chun
authors.initials: ZC
authors.lastname: Zhou
authors.forename: Zhong-Ping
authors.initials: ZP
authors.lastname: Feng
mesh_terms: D000042:Absorption; D002681:China; D014644:Genetic Variation; D010758:Phosphorus / Q000032:analysis / Q000378:metabolism*; D028223:Pinus / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism*; D013045:Species Specificity; D013312:Stress, Physiological
chemical_list: D010758:Phosphorus