| Comparison of morphological and physiological responses of two different species of northern winter rapeseed before overwintering |
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| DOI：10.7606/j.issn.1000-7601.2022.05.05 |
| Key Words: winter rapeseed overwinter Brassica rapa L. Brassica napus morphological characteristics photosynthesis osmotic regulators |
| Author Name | Affiliation | | LI Peng | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | MA Li | State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | XU Fang | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | LIU Lijun | State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | YAO Yanlin | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | PU Yuanyuan | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | WANG Wangtian | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Xuecai | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | FANG Yan | State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | SUN Wancang | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | WU Junyan | College of Agronomy, Gansu Agricultural University, Rapeseed Engineering Research Center of Gansu Province, Lanzhou, Gansu 730070, China
State Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Two strong winter rapeseed Brassica rapa L. and Brassica napus varieties were selected from October to November 2020 to study and compare the growth characteristics of two different types of winter rape in northern China before overwintering. Changes in morphological characteristics, photosynthetic characteristics and osmotic regulation characteristics, and correlation analysis with overwintering rate were observed. The results showed that with the decrease of temperature before overwintering, the root\|shoot ratio of winter rapeseed Brassica rapa L. increased by 164.7%, while the root\|shoot ratio of winter rapeseed Brassica napus did not change much, and there was a significant difference between the two varieties. The tissue water content of both varieties changed slightly, ranging between 69% and 89%. With the decrease of temperature, the leaf area of winter rapeseed Brassica rapa L. and winter rapeseed Brassica napus gradually decreased by 5%~16%, and the SPAD value of chlorophyll showed an overall increasing trend. The photosynthetic rate, transpiration rate, and stomatal conductance were all gradually decreased by 54%~64%, and the intercellular CO2 concentration gradually increased by 19%~29%. The contents of soluble protein and proline in leaves and roots increased by 26%~91%. The content of soluble sugar in leaves first increased and then decreased, and the content of soluble sugar in roots decreased first and then increased. The content of sodium ion and potassium ion in leaves gradually decreased by 20%~47%, and the content of calcium ion increased first and then decreased. The content of potassium ion and calcium ion in the root first decreased and then increased. Brassica napus showed a trend of rising first and then falling. Findings suggest that the cold resistance of winter rapeseed Brassica rapa L. Longyou 6 is stronger than that of winter rapeseed Brassica napus 2019-QL-GAU-30. |
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