| Evaluation of water use efficiency of seven walnut rootstock seedlings based on functional traits |
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| DOI：10.7606/j.issn.1000-7601.2022.01.20 |
| Key Words: walnut rootstock water use efficiency specific leaf area drought water use functional traits |
| Author Name | Affiliation | | LIU Binghua | Shandong Academy of Forestry, Jinan, Shandong 250014, China | | ZHANG Jixia | Natural Resources and Planning Bureau of Mengyin County,Shandong Province, Linyi, Shandong 276200, China | | TANG Guimin | Shandong Yingcai University, Jinan, Shandong 251400, China | | ZHAO Dengchao | Shandong Academy of Forestry, Jinan, Shandong 250014, China | | LIANG Jing | Shandong Academy of Forestry, Jinan, Shandong 250014, China |
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| Abstract: |
| In order to select walnut rootstock with high water use efficiency (WUE), the long\|term WUE (WUEL) and the fourteen water use functional traits of 7 types of walnut rootstock under drought condition were measured. Correlation relationship between WUEL and the functional traits were analyzed. Comprehensive evaluation of the WUE of the 7 types of walnut rootstock were carried out using subordinate function coefficient analysis, principal component analysis (PCA), and cluster analysis. The results showed that there were significant interspecific differences in WUEL among 7 types of walnut rootstock seedlings (P<0.001). Jizhuamian and Xiangling showed higher WUEL which was 66.26 g·kg-1and 60.05 g·kg-1, respectively. Manchurian walnut and Ma walnut had the medium WUEL which was 52.67 g·kg-1 and 47.78 g·kg-1, respectively. Black walnut, Iron walnut, and Chinese wingnut had lower WUEL which was 41.88, 37.38 g·kg-1and 32.85 g·kg-1, respectively. WUEL was negatively correlated with specific leaf area (SLA), and positively correlated with other 13 functional traits.The results from subordinate function coefficient analysis showed that subordinate function values of Ma walnut, Iron walnut, Black walnut, Manchurian walnut, Chinese wingnut, Jizhuamian, and Xiangling were 0.479,0.217,0.170,0.502,0.167,0.991, and 0.700, respectively, suggesting that WUE of the analyzed walnut rootstocks from highest to lowest were Jizhuamian, Xiangling, Manchurian walnut, Ma walnut, Iron walnut, Black walnut, and Chinese wingnut. Three functional traits of plant height, leaf chlorophyll content, and SLA were selectedas core evaluation indicators of WUE based on the PCA results. Synthetic analysis indexes of Ma walnut, Iron walnut, Black walnut, Manchurian walnut, Chinese wingnut, Jizhuamian, and Xiangling were -0.175,-3.197,-3.158, 1.041,-3.801, 5.875, and 3.414, respectively, suggesting that the WUE of the analyzed walnut rootstocks from PCA were in descending order as Jizhuamian, Xiangling, Manchurian walnut, Ma walnut, Black walnut, Iron walnut, and Chinese wingnut. Cluster analysis divided the studied species into three groups. The first group including Jizhuamian and Xiangling had the higher WUEL and the better growth performance under drought condition. The second group included Manchurian walnut, Ma walnut which were characterized by the moderate WUEL and growth performance under drought condition. The third group consisting of Black walnut, Iron walnut, and Chinese wingnut had the lowest WUEL and the worst growth performance under drought condition. The WUE evaluation results from the three evaluation methods for the 7 kinds of walnut rootstock seedlings were the same and consistent with the growth and morphological performance of each rootstock seedlings at the end of the drought treatment.The results from this study provide an important reference for selecting walnut rootstock with high WUE. |
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