|
| Effects of warming on protective enzyme activities of winter wheat in different soils |
| Received:November 17, 2022 Revised:February 12, 2023 |
| View Full Text View/Add Comment Download reader |
| KeyWord:winter wheat;warming throughout the growth period;soil type;protective enzyme activity;yield |
| Author Name | Affiliation | E-mail | | JIN Lihui | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | FENG Qian | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | PAN Shiqiu | Guilin Meteorological Bureau, Guilin 541001, China | | | MIAO Shujie | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | QIAO Yunfa | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | qiaoyunfa@nuist.edu.cn |
|
| Hits: 671 |
| Download times: 797 |
| Abstract: |
| To explore the development of winter wheat production under global warming, the effects of elevated temperature on leaf protective enzyme activity and winter wheat yield during the vegetative and reproductive growth periods were studied by experimental warming during the whole growth period. In November 2021, a frame-planting experiment was conducted at the Agricultural Meteorological Experimental Station of Nanjing University of Information Science and Technology. Ambient air temperature was designed as control（CK）, and an open warming device was used to simulate an atmospheric temperature increase of 1.5 ℃（eT）. Winter wheat grown on black soil （from Heilongjiang）, brick red soil（from Hainan）, and yellow-brown soil（from Nanjing）was the focus of this research. The changes in growth amount at the maturity stage were reflected by indicators such as plant height, kernel number per panicle, and 1 000-grain weight. The contents of chlorophyll（SPAD）and malondialdehyde（MDA）, and the activities of superoxide dismutase（SOD）, peroxidase（POD）and catalase（CAT）in wheat leaves of jointing and flowering stages were used to characterize the protective enzyme system. The results showed that elevated temperature significantly reduced the chlorophyll content of wheat grown on yellow-brown soil, black soil, and brick red soil by 9.51%, 19.03% and 4.60%, respectively, and increased the MDA content at the flowering stage by 10.59%, 14.83% and 13.72%. This indicates that warming attenuated leaf function by affecting photosynthesis and membrane lipid peroxidation. Significantly increased SOD, POD, and CAT activities in wheat leaves during the flowering stages indicates that winter wheat leaves maintain a high protective capacity under warming conditions. MDA content and POD activity showed significant negative correlation with yield during the reproductive growth period. In addition, elevated temperature significantly decreased plant height, kernel number per panicle and 1 000-grain weight of wheat grown on yellow-brown and black soils, leading to a 33.86% and 16.53% yield reduction, respectively. The degree of response of wheat grown in black soil to elevated temperature is weaker than that of wheat grown in yellow-brown soil. The 1 000-grain weight of wheat grown in brick red soil was decreased by elevated temperature, but the yield did not decrease significantly. In general, warming slows the growth of winter wheat by reducing photosynthesis and increasing the level of membrane lipid peroxidation. This mitigation effect is weaker on winter wheat in black soil, but stronger on that in yellow-brown soil. |
|
|
|
