Effects of nighttime warming on dry matter accumulation and distribution and root growth of wheat under soil lead stress
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DOI:10.7606/j.issn.1000-7601.2023.01.26
Key Words: nighttime warming  winter wheat  soil pollution  lead  dry matter  root growth
Author NameAffiliation
KOU Taiji Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471023, China 
CHENG Xianghan Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471023, China 
HE Juan Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471023, China 
WANG Lirui Agricultural College, Henan University of Science and Technology, Luoyang, Henan 471023, China 
ZHANG Huizhi Institute of Agricultural Information and Economics, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Key Laboratory of Urban Agriculture (North China), Ministry of Agriculture, Beijing 100097, China 
CHEN Junhong Institute of Agricultural Information and Economics, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
Key Laboratory of Urban Agriculture (North China), Ministry of Agriculture, Beijing 100097, China 
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Abstract:
      Effects of climate warming and soil lead (Pb) contamination on growth of crops and their underground roots remain as urgent concerns. In this study, responses of winter wheat (vs. Zhongmai 175) in dry matter accumulation and its distribution of the above and belowground, harvest index and its root activity in key growth period to nighttime warming (NW) and lead (Pb) contamination were investigated. Results showed that the NW obviously enhanced average soil temperature with range of 0.6~1.4℃ during wheat growth period. The NW significantly increased total biomass and yield of wheat in non\|Pb pollution at dough stage, while harvest index was observably decreased. Compared with decreases of total biomass and yield along with the increasing Pb concentration under control environment, the NW significantly increased wheat yield by 14.7%~19.1%, total biomass by 13.0%~26.5% and harvest index, further indicating that the NW improved the ability of wheat resisting the Pb pollution hazard. The NW basically showed a positive effect on dry matter accumulations of roots, while Pb pollution stress did a negative effect on those. The NW basically raised root dry matter and the ratios of root to shoot biomass, but they were restricted by the level of Pb pollution and wheat growth stage. The root activities of wheat decreased with increasing Pb concentration in soil. However, lower soil Pb concentration basically improved the root activities at different growth periods under the NW. The NW significantly increased the root activities by 12.2%~40.2% of four Pb treatments in heading stage. The enhancement of root activities under the NW helped the crop resist Pb stress. Our findings shed light on the positive effects of the NW on wheat root system, contributing to improve the ability of wheat resisting soil Pb stress.