| 黑果枸杞根系构型对干旱胁迫的响应机制 |
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| 引用本文： | 张金菊,郭有燕,田青,包新光,张惠云.黑果枸杞根系构型对干旱胁迫的响应机制[J].南方农业学报,2022,53(8):2215-2223. |
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| 作者姓名： | 张金菊 郭有燕 田青 包新光 张惠云 |
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| 作者单位： | 1. 甘肃农业大学林学院, 甘肃兰州 730070;2. 河西学院乡村振兴研究院, 甘肃张掖 734000;3. 河西学院经济管理学院, 甘肃张掖 734000;4. 甘肃省白龙江林业生态监测和调查规划院, 甘肃兰州 730030 |
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| 基金项目： | 国家自然科学基金项目（32060334）；甘肃省高等学校创新基金项目（2021A-122） |
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| 摘 要： | 【目的】探讨黑果枸杞幼苗根系构型对干旱胁迫的响应机制，为黑果枸杞的种植、种群恢复和合理利用及其他旱生植物研究提供理论依据。【方法】以盆栽黑果枸杞幼苗为研究对象，采用控水法，设置正常供水（20.97%）（对照， CK）、轻度胁迫 （15.51%）、中度胁迫 （3.42%）、重度胁迫 （2.35%）和极重度胁迫 （1.45%）5个胁迫梯度，通过对比不同胁迫梯度对黑果枸杞幼苗根系拓扑指数、拓扑结构、生物量及相关根系形态指标的影响，分析黑果枸杞幼苗根系构型对干旱胁迫的响应。【结果】干旱胁迫下，黑果枸杞根系构型趋向于叉状分支模型。随干旱胁迫程度的增加，黑果枸杞幼苗根系由叉状分支向鱼尾形分支过渡；幼苗地上生物量、地下生物量和总生物量均呈现先增加后减少的趋势，且地上生物量和总生物量在不同处理间差异显著 （P<0.05）。与CK相比，轻度和中度胁迫下总生物量分别增加82.47%和41.09%。根冠比呈现逐渐增加的变化趋势；根长、根表面积和根体积均呈现出先增加后减小的变化趋势；而比根长和比表面积呈逐渐减小的变化趋势，轻度、中度、重度和极重度胁迫分别降低7.73%、 10.25%、 60.62%和77.09%，比表面积分别减小17.59%、 30.04%、 80.15%和83.40%。不同径级根长、根表面积和根体积均在轻度胁迫时达最大值，根长和根表面积随干旱胁迫程度的增加各径级排序依次为0~0.5 mm>0.5~1.0 mm>1.0~1.5 mm>1.5~2.0 mm>2.0~2.5mm。【结论】黑果枸杞的生长受干旱胁迫的影响，其根系不同形态指标及根系构型存在差异。轻度干旱胁迫有利于黑果枸杞幼苗根系正常生长，但黑果枸杞的耐受程度存在阈值，土壤含水量为15.51%时生长最佳。
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| 关 键 词： | 黑果枸杞 根系构型 干旱胁迫 拓扑结构 |
| 收稿时间： | 2022-01-20 |
Response mechanism of Lycium ruthenicum root architecture to drought stress |
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| ZHANG Jin-ju,GUO You-yan,TIAN Qing,BAO Xin-guang,ZHANG Hui-yun.Response mechanism of Lycium ruthenicum root architecture to drought stress[J].Journal of Southern Agriculture,2022,53(8):2215-2223. |
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| Authors: | ZHANG Jin-ju GUO You-yan TIAN Qing BAO Xin-guang ZHANG Hui-yun |
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| Affiliation: | 1. College of Forestry, Gansu Agricultural University, Lanzhou, Gansu 730070, China;2. Rural Revitalization Research Institute, Hexi University, Zhangye, Gansu 734000, China;3. School of Economics and Management, Hexi University, Zhangye, Gansu 734000, China;4. Gansu Bailong River Forestry Ecological Monitoring and Investigation Planning Institute, Lanzhou, Gansu 730030, China |
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| Abstract: | 【Objective】To investigate response mechanism of root architecture of Lycium ruthenicum seedlings to drought stress，so as to provide scientific theoretical basis for planting，population restoration and appropriate utilization of L.ruthenicum and study on other xerophytic plants.【Method】 Potted L.ruthenicum seedlings were taken as research object，and water control method was used to set 5 stress gradients: normal water supply （20.97%）（control，CK），mild stress （15.51%），moderate stress（3.42%），severe stress（2.35%）and extremely severe stress（1.45%）.Through comparing root topology index，topological structure，biomass and relative root morphological indexes of L.ruthenicum seedlings，zzthe response of root architecture of L.ruthenicum seedlings to drought stress was analyzed.【Result】 Under drought stress，the root structure of L.ruthenicum suited forked branch model.With the increase of the degree of drought stress，the root of L.ruthenicum seedlings transitioned from forked branch to fishtail branch；above-ground biomass，below-ground biomass and total biomass of the seedlings increased first and then decreased，and there were significant differences in aboveground biomass and total biomass among different treatments（P<0.05）.Compared with CK，the total biomass under mild and moderate stress increased by 82.47% and 41.09%，respectively.root-shoot ratio gradually increased； root length，root surface area and root volume all first increased and then decreased；specific root length and specific surface area decreased gradually: in mild，moderate，severe and extremely severe stress specific root length decreased by 7.73%，10.25%，60.62% and 77.09%，and specific surface area decreased by 17.59%，30.04%，80.15% and 83.40%，respectively.Root length，root surface area and root volume of different diameter classes all reached the maximum value under mild stress.The order of root length and root surface area with the increase of drought stress was 0-0.5 mm>0.5-1.0 mm>1.0-1.5 mm> 1.5-2.0 mm>2.0-2.5 mm.【Conclusion】Growth of L.ruthenicum is affected by drought stress，and there are differences between different morphological indexes and root architecture.Mild drought stress is conducive to the growth of the root of L.ruthenicum seedlings，but there is a threshold for the tolerance of L.ruthenicum，and the growth is best when the soil water content is 15.51%. |
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