| 肉苁蓉2种寄主植物和一体苗对盐胁迫的光合响应 |
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| 引用本文：马桃桃，郭晔红，安芳芳，张文瑶，李梅英.肉苁蓉2种寄主植物和一体苗对盐胁迫的光合响应[J].西北农业学报,2025,(4):676~685 |
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| 基金项目:国家自然科学基金（31860349）；甘肃省科技计划（18YFlNA072）。 |
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| 中文摘要:以肉苁蓉2种寄主植物梭梭和四翅滨藜的1 a生实生苗为材料，通过盆栽试验设置0、100、300、500、700 mmol·L-1 5个盐胁迫处理，研究盐胁迫对梭梭和四翅滨藜叶片光合日变化以及一体苗培育的影响，为肉苁蓉优良寄主的筛选以及寄主-肉苁蓉一体苗培育提供理论依据。结果表明：随着盐胁迫程度的加重，梭梭的叶绿素b、叶黄素以及叶绿素（a+b）含量呈递减趋势，并在700 mmol·L-1处理与对照呈显著性差异；四翅滨藜的叶绿素a、叶黄素和叶绿素（a+b）含量均随盐胁迫程度加重逐渐降低。梭梭和四翅滨藜的光合日变化呈“双峰型”曲线，梭梭的Pn最大值出现在14:00，四翅滨藜的Pn最大值出现在10:00，盐胁迫下2种植物均存在“光合午休”现象，梭梭为气孔限制型，四翅滨藜为非气孔限制型。梭梭和四翅滨藜的一体苗接种成功率均随着盐胁迫程度的加重表现出先下降—增加—再下降的趋势，轻度和中度盐胁迫均可获得更高的梭梭-肉苁蓉一体苗培育成功率，而重度盐胁迫下四翅滨藜-肉苁蓉一体苗培育成功率更高。表明梭梭和四翅滨藜对轻度盐胁迫处理有较强的适应性，重度盐胁迫可明显抑制2 种植物的光合能力，梭梭-肉苁蓉一体苗可在轻度和中度盐碱地培育，而四翅滨藜-肉苁蓉一体苗则可在重度盐碱地培育。 |
| 中文关键词:盐胁迫 肉苁蓉 寄主植物 光合日变化 一体苗 |
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| Photosynthetic Response of Cistanche deserticola to Salt Stress in Two Host Plants and Its Integrated Seedlings |
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| Abstract:Using annual seedlings of two host plantsof Cistanche deserticola,Haloxylon ammodendron and Atriplex canescens, as the experimental materials,a pot experiment was conducted to study the effects of five salt stress treatments ( 0,100,300,500 and 700 mmol·L-1) on the daily changes of photosynthesis in the leaves of Haloxylon ammodendron and Atriplex canescens,as well as on the cultivation of integrated seedlings.The aim is to provide a theoretical basis for selecting excellent hosts for Cistanche deserticola and cultivating intigrated seedling.The results showed that the chlorophyll b,lutein and chlorophyll (a+b) contents of Haloxylon ammodendron exhibited a decreasing trend with the increase of salt stress and were significantly different from the control at 700 mmol·L-1.The chlorophyll a,lutein and chlorophyll (a+b) contents of Atriplex canescens gradually decreased with the increase of salt stress.The daily change of photosynthesis of Haloxylon ammodendron and Atriplex canescens followed a “bimodal” curve,with maximum Pn value for Haloxylon ammodendron occurring at 14:00 and for Atriplex canescens at 10:00.A “photosynthesis lunch break” phenomenon was observed in both plants under salt stress.Haloxylon ammodendron exhibited stomatal limitation,while Atriplex canescens displayed non-stomatal limitation.The success rates of inoculating Haloxylon ammodendron and Atriplex canescens as integrated seedlings showed a pattern of decreasing-increasing-decreasing with increasing salt stress.Success rates were higher for both species under mild and moderate salt stress,and even higher under severe salt stress.This study demonstrates that Haloxylon ammodendron and Atriplex canescent are strongly adapted to mild salt stress treatments,while heavy salt stress can significantly inhibit the photosynthetic capacity of the two plants.Haloxylon ammodendron-Cistanche deserticola integrated seedlings can be cultivated in mildly and moderately saline soils,whereas those of Atriplex canescens-Cistanche deserticola are suitable for cultivation in heavy saline soils. |
| keywords:Salt stress Cistanche deserticola Host plants Photosynthesis diurnal variation Integrated seedling |
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