Abstract: Abstracts: 【Objective】Super-high-yielding soybean had certain advantages in plant type characteristics. This study investigated the morphological and physiological characteristics of super-high-yielding soybean Liaodou14. 【Method】Comparative analysis of plant type characteristics were carried out through multi-year experiments with super-high-yielding soybean Liaodou14 and general soybean Liaodou11 as varieties. 【Result】The chlorophyll content and photosynthetic rate of L14 from seedling to full podding were not superior to L11, but higher obviously after full podding. When the photosynthetic rate of different nodes was tested, it was found that the difference of photosynthetic rate between upper layer and lower layer was smaller and the leaves of lower layer senesced slower for super-high-yielding soybean. The distribution of petiole length and LSI (leaf shape index) of L14 were more reasonable, which made it intercept more sunlight at higher LAI. The LAI and photosynthetic rate of L14 maximized later than L11, but had a longer duration and descended slower in late stage. The accumulation of biological yield of L14 was smaller before podding, but higher than L11 after podding. After podding, L14 transported more photosynthetic products to pods, which made it got higher HI. 【Conclusion】The main reason why super-high-yielding soybean L14 got higher yield was that from full podding to late pod-filling, it had better canopy structure, maintained higher LAI and photosynthetic potential and had higher photosynthetic productivity.

Key words: Soybean (Glycine max), Super-high-yielding, Morphological characteristics, Physiological characteristics, Photosynthetic rate