| A study on drought resistance of seedlings of different Zanthoxylum bungeanum strains |
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| DOI：10.7606/j.issn.1000-7601.2019.06.02 |
| Key Words: Zanthoxylum bungeanum strains drought stress transpiration water consumption biomass drought resistance physiological index drought resistance evaluation |
| Author Name | Affiliation | | CHEN Honglin | College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIN Qiang | Qinghai Provincial Forestry Special Material Reserve Center,Xining, Qinghai 810000, China | | ZHANG Qun | College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHENG Tao | College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | SU Kexing | College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Hui | Forestry Development Center of Fuping County, Fuping, Shaanxi, 711700, China | | LIU Shuming | College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| This study assessed the adaptability of Zanthoxylum bungeanum seedlings to drought stress and the difference between different strains including Xunhua (QHXH), Fengxian (SXFX), Qinan (GSQA), Shexian (HBSX), and Hancheng (SXHC) in China. A set of pot experiments was conducted to study water consumption, biomass, and the physiological characteristics of Z. bungeanum seedlings. The one\|year\|old seedlings of Xunhua (QHXH), Fengxian (SXFX), Qinan (GSQA), Shexian (HBSX), and Hancheng (SXHC) Z. bungeanum, which have better fruit quality in northern China, were used as materials. Four relative soil moisture contents were used including 75%~80% (suitable water, CK), 55%~60% (mild stress, MIS), 40%~45% (moderate stress, MOS) and 30%~35% (severe stress, SES) in the experiments. The water consumption, biomass, and drought resistance physiological indexes of different strains were measured in conditions of different moisture conditions from May to August, 2016. The drought resistance of Z. bungeanum seedlings was comprehensively evaluated with the fuzzy mathematical membership function formula. The results showed that water consumption in Z. bungeanum decreased under drought stress, with significant differences (P<0.05) among strains. Under moderate drought conditions, water consumption of QHXH, SXFX, GSQA, HBSX, and SXHC from May to August were 1 148.97 g, 1 001.78 g, 923.08 g, 792.92 g, and 951.06 g, respectively. Further increase in drought stress resulted in a reduction in total biomass, whereas the ratio of root dry weight to total biomass increased and that of leaf dry weight to total biomass decreased. Under moderate drought conditions, the leaf dry weight of QHXH, SXFX, GSQA, HBSX, and SXHC decreased by 42.9%, 42.8%, 40.1%, 38.5%, and 30.5%, respectively. Under extreme drought conditions, these percentages decreased to 61.1%, 58.4%, 52.6%, 48.9%, and 45.6%, respectively. Under severe water stress, the height and diameter growth of QHXH, SXFX, GSQA，HBSX, and SXHC decreased by 61.6%, 67.5%, 56.2%, 55.8%, and 47.2% (P<0.05), and 38.7%, 44.2%, 34.5%, 32.4%, and 32.7% (P<0.05), the WUE increased by 24.8%, 32.7%, 44.8%, 26.2% and 36.4% (P<0.05), respectively, compared to the CK, and significant (P<0.05) changes in the physiological indexes were observed among different strains, except for POD (mild stress). Moreover, the content of soluble protein and proline, activity of superoxide dismutase and peroxidase, relative water content, water use efficiency of GSQA and SXHC significantly increased (P<0.05) with drought, which indicated stronger characteristics of drought resistance. Different strains showed relatively stable drought resistance. Drought resistance of different strains in decreasing order was as follow: SXHC>HBSX>GSQA>QHXH>SXFX, which were based on growth and physiological characteristics. The strains of SXHC and HBSX is thus more suitable for propagation in the semi\|humid and semi\|arid areas of northern China. Comprehensive evaluation of the drought resistance of Z. bungeanum was conducted by combining the physiological index and the growth index, which eliminated the one\|sidedness of drought resistance evaluation when using a single physiological index. |
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