| Screening and comparison of leaf drought resistance indexes of 15 varieties of Lycium barbarum |
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| DOI：10.7606/j.issn.1000-7601.2025.01.05 |
| Key Words: Lycium barbarum varieties leaf microstructure comprehensive evaluation of drought resistance membership function |
| Author Name | Affiliation | | LV Xiaoxu | Gansu Medical College, Pingliang, Gansu 744000, China | | YANG Lu | Gansu Medical College, Pingliang, Gansu 744000, China | | WANG Dacheng | Gansu Medical College, Pingliang, Gansu 744000, China | | ZHAO Yingshu | Forestry Technology Extension Service Center of Zhongning County, Ningxia Hui Autonomous Region, Zhongning, Ningxia 755100,China | | GUAN Jianru | Gansu Medical College, Pingliang, Gansu 744000, China |
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| Abstract: |
| Five leaf morphological characteristics—leaf area (LA), dry weight (DWT), fresh weight (FW), specific leaf area (SLA), and dry\|to\|fresh weight ratio (LDMC)—were calculated for 15 varieties of Lycium barbarum in Zhongning County. Ten leaf microstructure features\|leaf thickness (LT), thickness of upper epidermal cell (TU), thickness of lower epidermal cell (TL), thickness of palisade tissue (TPT), thickness of spongy tissue (TST), palisade tissue thickness/spongy tissue thickness (P/S), tightness of leaf structure (TLS), leaf structure porosity (LLS), proportion of upper epidermal (PU) and proportion of lower epidermal (PL) were determined by using the optimized and improved paraffin section technique. The drought resistance of Lycium barbarum cultivars was evaluated by using the membership function and principal component analysis of these 15 indexes. The results showed that: (1) The coefficient of variation for the drought resistance coefficients across 15 indices ranged from 12.900% to 58.248%. Among these, the index with the highest coefficient of variation was LA, while the index with the lowest was TPT. (2) According to the correlation analysis results, LT was significantly negatively correlated with TLS, LLS, PU and PL. The cluster analysis results showed that the 15 leaf indexes were divided into 3 categories, and LLS, LA and SLA had the highest correlation index among all categories, which were the key indexes of drought resistance of Lycium barbarum. Principal component analysis showed that the cumulative contribution rate of six principal component factors, including TLS, TST, LA, SLA, P/S and LDMC, reached 89.662%. LLS, TLS, TST, LA, SLA, P/S and LDMC were the key indicators for drought resistance evaluation of Lycium barbarum. (3)Drought resistance order of 15 Lycium barbarum varieties: Lycium barbarum ‘Ningqi-7’>‘Ningnongqi-5’>‘Ningqi-9’>‘Ningqi-4’>‘Ningnongqi-1’>‘Ningqi-3’>‘Ningqi-1’>‘Ningqi-6’>‘Ningqi-5’>‘Ningqi-10’>‘Ningnongqi-4’>‘Mengqi-1’>‘Ningqi-2’>‘Ningqi-8’>‘Ningnongqi-9’. The results of this study can help select excellent drought resistant varieties of Lycium barbarum ，reduce drought stress，and promote the development of Lycium barbarum industry. |
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