| Effects of root\|shoot interaction on yield and agronomic traits of soybean under different soil moisture conditions |
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| DOI：10.7606/j.issn81000-7601.2020.03.32 |
| Key Words: soybean shoot\|root interaction water stress agronomic traits grain yield |
| Author Name | Affiliation | | LI Shengyou | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | DONG Lijie | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | WANG Yazhen | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | CAO Yongqiang | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | YAN Chunjuan | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | WANG Wenbin | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China | | SONG Shuhong | Institute of Crop Research, Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 100161, China |
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| Abstract: |
| The purpose of this study was to determine the effects of soybean root\|shoot interaction on yield and agronomic traits under different soil moisture conditions, thus provide theoretical basis for drought resistant soybean breeding. Grafted plants of drought\|tolerant cultivar Liaodou 14 and drought\|sensitive cultivar Liaodou 21 grew in the pot\|culture experiments. Well\|watered (80% of field water holding capacity) and water stress (50% of field water holding capacity, lasting for 20 days) were conducted during podding stage, and the agronomic traits were measured at maturity. The results showed that the agronomic traits and yield of soybean were mainly determined by the shoot genotype, but were also affected by the root genotype under water stress. Compared to Liaodou 21 scion, Liaodou 14 scion had averaged increases of 24.3% and 14.8% in plant height, 19.6% and 15.3% in main stem node number, 60.2% and 90.6% in number of branches, 57.1% and 87.1% in biomass, 70.0% and 92.3% in number of pod per plant, and 159.9% and 197.9% in number of pod on branch; it also had averaged decreases of 57.8% and 60.4% in flat pods rates on branch, and increases of 19.9% and 54.9% in grain yield under both well\|watered and water stress conditions, respectively. Under water stress, grafting Liaodou 21 scion onto Liaodou14 root stock resulted in significant increases in pod weight per plant, number of pods per plant, number of seeds per plant, 100\|seed mass, and grain yield per plant by 45.8%, 27.4%, 21.7%, 5.2%, and 20.4%, respectively, which was attributed to greater available number of pods on 9~15th nodes on stem, as compared to its self\|grafts. Our results suggested that the cooperative improvement between shoot and root would be an important way to improve the drought resistance of soybean. |
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