%0 Journal Article %A YANG Shurong %A FU Luping %A FEI Shuaipeng %A LI Simin %A CHEN Xinmin %A XIA Xianchun %A XIAO Yonggui %A MENG Yaxiong %T Accumulation and Partitioning Characteristics of Photosynthetic Product of 7 Main Cultivars in Northern Winter Wheat Zone %D 2021 %R 10.11869/j.issn.100-8551.2021.08.1740 %J Journal of Nuclear Agricultural Sciences %P 1740-1750 %V 35 %N 8 %X The objectives of the present study were to analyze the dry matter accumulation and partitioning characteristics of wheat cultivars in the Northern Winter Wheat Zone (NWWZ). Seven elite cultivars from the NWWZ during the past 20 years were selected and planted at two experimental sites in two cropping seasons. The dynamic accumulation and transportation of dry matter in different organs during grain-filling, harvest index (HI), and grain yield of all cultivars were investigated. The results showed that the HI and biomass had significant effects on yield. Zhongmai 816 and Zhongmai 175 had higher yield potential, which were 4 923.0 kg·hm-2 and 4 913.0 kg·hm-2, respectively, mainly attributed to their higher biomass yield and HI. The analyses of dry matter accumulation revealed that photosynthetic area at seedling stage and the photosynthetic utilization efficiency during grain filling stage had important effects on dry matter accumulation. Cultivars with low chlorophyll content, small flag leaf area (FLA), and high photosynthetic rate (Pn) during the grain filling stage had higher dry matter accumulation efficiency and more soluble sugar storage in stems and leaves, such as Zhongmai 175. In term of the dry matter distribution in vegetative organs, the dry matter storage of vegetative organs in Zhongmai 816 and Zhongmai 175 at the flowering stage was slightly different from that of other cultivars, but the dry matter transportation efficiency in stems and leaves at the maturity stage was higher, and the residues of stored matter was less. In addition, the photosynthetic compounds stored in Zhongmai 175 and Zhongmai 1062 before flowering had the highest contributions to grains than other cultivars. That demonstrated that improving the light energy utilization efficiency of cultivars was a feasible way to increase the genetic yield potential. In addition, the selection of dry matter accumulation before the flowering stage and the dry matter transportation efficiency at grain filling stage is helpful to reduce the residual photosynthetic products in tissues and organs at maturity, and improve the efficiency of transporting substance to grains. This study can determine the future breeding improvment target and direction for new wheat cultivars in the NWWZ. %U https://www.hnxb.org.cn/EN/10.11869/j.issn.100-8551.2021.08.1740