| Effects of dry matter translocation on yield formation of wheat with different genotypes under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2021.06.07 |
| Key Words: wheat genotypes dry matter chlorophyll vascular bundle antioxidant defense system yield |
| Author Name | Affiliation | | DING Tongtong | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Pufang | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China | | CAO Li | College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China | | LONG Xinyuan | College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIU Bo | College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China | | MA Yongqing | Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Six wheat genotypes including two diploid wheat, two tetraploid wheat and two hexaploid genotypes were used to evaluate the effect of dry matter translocation on grain yield formation and its regulation mechanism. The results indicated that drought stress significantly reduced grain yield of wheat. Compared with sufficient water supply, the grain yields of Triticum boeoticum, T. monococcum, T. dicoccoides, T. dicoccon, Xiaoyan 22, Changhan 58 were reduced by 48.00%, 37.93%, 40.19%, 38.77%, 19.58% and 16.11%, respectively, under drought condition. Compared with diploid and tetraploid wheat, the grain yield of hexaploid wheat was more stable. The grain yield of hexaploid wheat was significantly higher than that of diploid and tetraploid wheat. Drought stress significantly reduced the dry matter translocation amount and accumulation, compared with sufficient water supply conditions. Dry matter translocation amount before anthesis was decreased by 29%, 27%, 30%, 14%, 3% and 8% in Triticum boeoticum, T. monococcum, T. dicoccoides, T. dicoccon, Xiaoyan 22, and Changhan 58. The accumulation after anthesis was decreased by 59%, 42%, 44%, 45%, 23% and 17% in Triticum boeoticum, T. monococcum, T. dicoccoides, respectively. However, drought stress had different effects on the dry matter translocation rate and contribution rate in wheat with different genotypes. Compared with sufficient water supply conditions, the dry matter translocation rate of Triticum boeoticum, T. monococcum, T. dicoccoides, T. dicoccon, Xiaoyan 6, and Changhan 58 was reduced by 40%, 38%, 36%, 6%, -16% and -17% before anthesis. The contribution rate was decreased by 43%, 37%, 15%, 26%, 20% and 11%, respectively, and the dry matter contribution rate was increased by 5%, -3%, 13%, 6%, 2% and 2% after anthesis. Interestingly, the chlorophyll content, dry matter translocation capacity and antioxidant defense capacity in the hexaploid wheat were higher than those in the other wheat with different genotypes under drought stress. These results indicated that dry matter translocation and accumulation were key factors in grain yield formation. Higher dry matter translocation and accumulation under drought stress environment were associated with higher chlorophyll content, antioxidant defense ability and larger vascular bundle transport capacity to affect wheat yield. |
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