Landscape gradient of autumn photosynthetic decline in Abies sachalinensis seedlings  

作　　者：Tetsuto Sugai Wataru Ishizuka Toshihiro Watanabe 

机构地区：[1]Hokkaido Research Center,Forestry and Forest Products Research Institute,Hitsujigaoka 7,Sapporo 062-8516,Japan [2]Plant Nutrition Laboratory,Research Faculty of Agriculture,Hokkaido University,Sapporo 060-8689,Japan [3]Forest Research Institute,Hokkaido Research Organization,Bibai,Hokkaido 079-0198,Japan

出　　处：《Journal of Forestry Research》2023年第1期187-195,共9页林业研究（英文版）

基　　金：Japan Society for the Promotion of Science,KAKENHI(18J2013908)。

摘　　要：Understanding what environmental factors are genetically linked to a phenologic al event is critical for predicting responses to climate change.Photo synthetic phenology often varies among a species of evergreen conifers due to local adaptation.However,few empirical studies have revealed relevant relationships between climatic factors in provenance environments and photosynthetic phenology.This study evaluated the effects of environmental conditions of the growing site and seed source provenance on the seasonal changes in maximal photochemical quantum yield of photo systemⅡ(Fv/Fm)in a common garden experiment with 2-year-old seedlings of Sakhalin fir(Abies sachalinensis),a representative species with local adaptation,from four seed source provenances.A logistic model was constructed to explain the seasonal variation of Fv/Fmfrom July to October and the relationships between the estimated model parameters and representative factors featuring provenance environments were evaluated.The landscape gradient of the detected model parameters responsible for the provenance environments was visualized in a map of the distribution area.The lowest temperature was the most plausible factor in the growing environment to explain the seasonal changes of Fv/Fm.Among the representative meteorological factors of provenance environments,the lowest temperatures in July showed significant relationships with two model parameters,explaining the lower limit of Fv/Fmand the higher sensitivity of autumn Fv/Fmdecline.The estimated spatial maps of model parameters consistently showed that the higher the lowest temperature in July in the provenance environment,the lower the Fv/Fmin October and the greater the decrease in the autumn Fv/Fmdecline.Therefore,the lowest summer temperature could be associated with the local adaptation of autumn photosynthetic phenology in A.sachalinensis.

关 键 词：PHENOLOGY Local adaptation Genetic cline Lowest temperature 

分 类 号：S791.14[农业科学—林木遗传育种]