外源性钙对PEG模拟干旱胁迫环境下吊石苣苔种子萌发的影响

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Efects of Exogenous Calciumonthe GerminationofLysionotus pauciflorus Maxim.Seds Under Drought StressSimulated byPoly ethylene Glycol （PEG）

LU Xiang，WAN Xiao-xia，CHENG Taoetal（Guizhou ProvincialFodand DrugInspection Institute，Guiyang Guizhou509） Abstract[Objective]To investigate the effects of exogenous calcium （ CaCl2 ）on seed germination of Lysionotus pauciflorus Maxim. under droughtstressimulatedbyplyethyleneglycol（EG-6O）.Metod]estudysetusixEG-60Ooncentrationgadients（0，01， 200，250 and 300g/L ）and four CaCl2 concentration gradients （0，10，20 and 30mmol/L ）to assess germination rate，germination energy，and germinationindex，ileaalyingteinteractnetweecalcumaddoughtstressResult]Geinationratesignificantlydcrasdhn PEG⩾200g/L （lowest at 300g/L ）. 20-30mmol/L （204号 CaCl2 increased germination rates by 10%-15% under severe drought （ PEG⩾ 200g/L） ），but inhibited germination under non-drought conditions （ ⩾20 mmol/L CaCl2 ）. Under moderate drought （ 50-125g/L PEG）， （204号 CaCl2 reduced germination energy by 8%-13% . Under severe drought （ 200-300g/L PEG）， 30 mmol/L CaCl2 improved germination energy by 6%-10% . At low PEG concentrations （ （0-125g/L ）， CaCl2 decreased germination index by 2.2-4.9.At high PEG concentrations （200- 300g/L ），30mmol/L CaCl2 restored germination index by1.5-3.4.[Conclusion]Exogenous calcium （ 20-30mmol/L ）could effectively alleviate drought-induced inhibition of L pauciflorus Maxim. seed germination，with its eficacy being drought-intensity dependent. These findings provide an optimized cultivation strategy for karst environments with drought stress.

Key WordsPolyethylene glycol; Drought stress;Lysionotus pauciflorus Maxim. ;Exogenous calcium

吊石苣苔（Lysionotuspauciflorus Maxim.）又名岩豇豆、石吊兰，为苦苣苔科（Gesneriaceae）吊石苣苔属（Lysionotus）植物，常为小灌木或亚灌木，在我国主要分布于秦岭以南地区，在越南及日本也有分布。（剩余8495字）