JIN Wu
School of Agronomy,Anhui Agricultural UniversityWAN Ming-yue
School of Agronomy,Anhui Agricultural UniversityLI Jun
School of Agronomy,Anhui Agricultural UniversityLYU Kun
School of Agronomy,Anhui Agricultural UniversityZHU Shang-shang
School of Agronomy,Anhui Agricultural UniversityLONG Qun
School of Agronomy,Anhui Agricultural UniversityCHEN Lin-ying
School of Agronomy,Anhui Agricultural UniversityMIAO Long
School of Agronomy,Anhui Agricultural UniversityGAO Hui-hui
School of Agronomy,Anhui Agricultural UniversityLI Jia-jia
School of Agronomy,Anhui Agricultural UniversityQIU Li-juan
Institute of Crop Sciences,Chinese Academy of Agricultural Sciences/The National Key Facility for Crop Gene Resources and Genetic Improvement(NFCRI)/Key Laboratory of Crop Gene Resource and Germplasm Enhancement(MOA)WANG Xiao-bo
School of Agronomy,Anhui Agricultural University1.School of Agronomy,Anhui Agricultural University;2.Institute of Crop Sciences,Chinese Academy of Agricultural Sciences/The National Key Facility for Crop Gene Resources and Genetic Improvement(NFCRI)/Key Laboratory of Crop Gene Resource and Germplasm Enhancement(MOA)
The National Key Research and Development Program of China (2021YFD1201605, 2021YFD1201603-4),Natural Science Foundation of Anhui Province (1908085QC105),Anhui University Natural Science Foundation-funded project (KJ2021A0200),The Innovation and Entrepreneurship Program for College Students of Anhui Province, China (S202010364128),Supported by the Special Fund for Anhui Agriculture Research System,Talent introduction and stabilization project of Anhui Agricultural University (yj2018-38),The Funds for scientific research activities of academic and technical leaders and reserve candidates in Anhui Province (2020H236)
Increasing planting density has become an effective way to improve soybean yield. However, the comprehensive evaluation system to identify density-tolerant soybean germplasm resources has not been systematized. This study attempts to construct an evaluation method based on multi-year data, followed by evaluating the density-tolerant characteristics to identify the elite soybean germplasm. Seventy-seven soybean germplasm resources suitable for Huang-Huai-Hai ecological area were sown with two densities including high-density sowing (plant spacing 8.0 cm, about 315,000 plants/ha) and conventional density sowing (plant spacing 13.0 cm, about 195,000 plants/ha). The evaluation of dense planting tolerance was conducted by obtaining nine relevant character indexes in two calendar years (2019 and 2020). Compared with the conventional planting density, the height of gravity center and bottom pod of the plant were significantly increased (P < 0.01) and (P < 0.05), respectively, and the number of effective branches and seed weight per plant decreased significantly (P < 0.01) under high planting density. According to the significant correlation coefficient, the principal component and membership function standardization analysis were carried out to estimate the comprehensive evaluation value (M) which was deployed for the clustering analysis. The dense planting tolerance characteristics were divided into five types (I, less dense type; II, strong less dense type; III, intermediate type; IV, strong dense type; V, dense type). Three soybean varieties (Wuxing 1, Motte*, and Gaozuoxuan 1) qualified for condensed planting were preliminarily identified. Collectively, this study established a density-tolerant evaluation method useful for developing new dense-planting varieties and studying their physiological mechanism in soybean.