| Cite this article: | 黄 玲,杨文平,梅沛沛,等.砂质脱潮土区不同冬小麦品种（系）抗倒特性研究[J].灌溉排水学报,0,():-. |
| HUANGLING,YANGWENPING,MEIPEIPEI,et al.砂质脱潮土区不同冬小麦品种（系）抗倒特性研究[J].灌溉排水学报,0,():-. |
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| Study on Lodging Resistance of Different Winter Wheat Varieties（lines）in Sandy Soil |
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HUANGLING1, YANGWENPING1, MEIPEIPEI1, JIAOSHUANG2, XULINA1, ZHANGZHIYONG1, OUXINGQI1, YAOSUMEI1
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1.Henan Institute of Science and Technology;2.Xinxiang Soil & Fertilizer Working Station
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| Abstract: |
| 【Objective】To study the lodging resistance of winter wheat in sandy soil area of Henan Province.【Method】13winter wheat genotypes (lines) were studied to analyze the relationship between agronomic characteristics, stem material properties, mechanical properties and lodging resistance of winter wheat in the middle stage of grain filling under disease free condition. Nine traits related culm lodging resistance index(CLRI)of the second internode were investigated by the analysis of correlation, cluster and principal component.【Result】Plant height and height of gravity center at the middle of filling stage were not the determinant factors for lodging of winter wheat varieties(lines). The second internode of different winter wheat varieties(lines) correlated negatively with mechanical strength and CLRI within a certain scope. The plant height component index and the ratio of the length of the second internode to plant height were negatively and significantly correlated with mechanical strength and CLRI. culm diameter, stem thickness and the ratio of stem thickness to culm diameter, were positively and significantly correlated with mechanical strength and CLRI. Cluster analysis showed that lodging resistance was improved by the reducing plant height and optimizing the second internode by groupsⅠ. GroupsⅡ improved lodging resistance by optimizing the traits of second internode. Groups Ⅲ decreased lodging by reducing plant height and increasing mechanical strength. There were 3 principal component factors cumulative contributed 83.72% of the total resources in principal component analysis. Principal component factors (PCF) reflected 48.11% variation of stem. Stem thickness, stem thickness /culm diameter and mechanical strength were the major factors which decided PCF1. Plant height, dry density and height of gravity center were key determinate factors of PCF2. Stem thickness and height of gravity center were the main factors to determine PCF3. 【Conclusion】Lodging resistance index (CLRI) is comprehensive trait and determined by multiple factors. The stem lodging resistance strength of wheat varieties could be evaluated through the length of the second internode /plant height, stem thickness, culm diameter, stem thickness /culm diameter. It is suggested that new breeding genotypes strategies are needed to enhance lodging resistance, particularly include mechanical strength, length of the second internode /plant height and stem thickness /culm diameter of the second internodes at sandy soil. |
| Key words: Winter wheat cultivars (lines); Sandy soil; Stem characterizes; Mechanical strength; Culm lodging resistant index (CLRI). |
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