| Evaluation of lodging resistance and correlation analysis with plant architecture in winter rapeseed |
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| DOI：10.7606/j.issn.1000-7601.2021.05.01 |
| Key Words: winter rapeseed (Brassica rapa L.) lodging coefficient plant architecture cluster analysis correlation analysis |
| Author Name | Affiliation | | FANG Xinling | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Hui | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WEI Jiaping | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DONG Xiaoyun | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | MI Wenbo | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHENG Guoqiang | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CAO Xiaodong | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Chengde | Gansu Agro\|techniology Extension Station, Lanzhou, Gansu 730070, China | | YUE Yaoqin | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Binfeng | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Gaoyang | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Zigang | Gansu Provincial Key Laboratory of Aridland Crop Science， Gansu Key Laboratory of Crop Improvement ＆ Germplasm Enhancement， Agricultural College, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In 2018-2019, 44 high\|generation hybrid lines of winter rapeseed (Brassica rapa L.) with different lodging resistance were used as test materials to provide genetically improving lodging resistance in winter rapeseed (Brassica rapa L.). Their lodging resistance was clustered and evaluated by the improved lodging coefficient (ILC) method. The impacts on the lodging resistance of winter rapeseed including plant form, stem mechanical properties and plant weight were discussed. The results showed that the tested winter rapeseed materials could be split into three forms according to the improved lodging coefficient. Type I, high resistance to lodging, including 2 lines, type II with moderate resistance to lodging, including 15 lines, and type III with the lowest resistance to lodging, including 27 lines. The findings of the clustering were largely consistent with the results of the field classification of lodging, with a strong positive correlation between them (r=0.452**). The improved coefficient of lodging was accurate and reliable in assessing the resistance of winter rapeseed lodging. The plant height and center of gravity height of type I materials with high lodging resistance decreased substantially compared to type II and III materials and the mean plant height and center of gravity decreased by 19.8 cm and 17.8 cm, respectively. Among the three types of winter rapeseed (Brassica rapa L.) materials, there were substantial variations in stem breaking\|resistant strength, and the average stem breaking\|resistant strength of category I materials was 2.59 times higher than that of type III materials. The lodging coefficient of the winter rapeseed (Brassica rapa L.) was positively correlated with plant height (r=0.346*), new aerial component weight (r=0.344*) and center of gravity height (r=0.579*) correlated negatively with break\|resistant power (r=-0.518*). Compared with the materials of class II and class III, the root length of the test materials of class I increased by 38% to 41%, the fresh root weight increased by 71% to 102%, the branch position decreased by 32% to 44%, and the number of branches at a time increased about 10%, the number of siliques per plant increased by 30% to 38%, the length of siliques increased by about 1%, the number of grains per horn increased by 11% to 14%, and the thousand\|grain weight increased by 21% to 23%. There were significant differences in the lodging resistance of the tested materials of winter rapeseed (Brassica rapa L.). The plant height, the height of the center of gravity, the fresh weight of the above ground, and the stalk resistance were the key factors affecting the lodging resistance. The winter rapeseed (Brassica rapa L.) with smaller plant height, lower center of gravity, and greater stalk bending resistance had higher yield and lodging resistance. |
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