2022/3/3 16:55:11 1,2, TAN Yanfang¹, LI Dongxing^1,2, WANG Bin^1,2, CHEN Ting^1,2, HUANG Fuzhao^1,2, LU Shuhua^1,2*]]> LI Jianxing^1,2, TAN Yanfang¹, LI Dongxing^1,2, WANG Bin^1,2, CHEN Ting^1,2, HUANG Fuzhao^1,2, LU Shuhua^1,2* 5true 2022/3/3 16:55:12 1, CAI Yingjian¹, YU Ruoying¹, YU Chao^1*, WANG Caisheng¹, FU Mei¹, GUO Bin²]]> XIE Zuomu¹, CAI Yingjian¹, YU Ruoying¹, YU Chao^1*, WANG Caisheng¹, FU Mei¹, GUO Bin² 4true Paraboea rufescens and Oreocharis cordatula, which are distributed in subtropical and temperate limestone areas respectively, were selected in this study. Their leaves were dehydrated for 1, 2 and 3 d respectively, and then rehydrated for 1 day. The leaf morphology, relative water content(RWC), photosynthetic activity, photosynthetic pigments, membrane integrity and osmotic adjustment substances during different dehydration and rehydration treatments were detected and analyzed. The results were as follows:(1)The leaf discs of Paraboea rufescens folded inward after dehydration, and the leaf upper epidermis was completely wrapped after dehydrated for two days, and the chlorophyll fluorescence parameter F_v/F_m, which characterized the maximum photosynthetic potential, was inhibited; Comparatively, the leaf discs of Oreocharis cordatula shrunk slightly, maintained the F_v/F_m level, and had higher photoprotection ability [Y(NPQ)]; The leaf discs of both species spread out and the F_v/F_m recovered following rewatered.(2)After two days of dehydration, the RWC of the two species decreased to about 5%, the relative electricity conductivities(REC)increased to 51.8% and 56.2% respectively, and the contents of soluble sugar increased significantly; During the following rewatered, RWC, REC and soluble sugar all recovered to the control level.(3)After further dehydration for three days, RWC of leaf discs of two species reached about 1.5%, the conductivity increased to about 95% after rehydration, and the F_v/F_m disappeared.(4)Chlorophyll a+b contents of Paraboea rufescens decreased by 50% during resuscitable dehydration and rehydration, while Oreocharis cordatula remained basically unchanged, which indicated that both of them were homoiochlorophyllous desiccation tolerance species and could quickly resume photosynthesis after rehydration following dehydration; During dehydration and rehydration, the contents of malonialdehyde(MDA)had no significant change, and remained extremely low level, which indicated two species could keep their membrane lipids from being oxidized under extreme drought conditions. To sum up, these two species can survive from dehydration to lower level of 5% RWC, therefore, they are both resurrection plants. Under severe dehydration, Paraboea rufescens can avoid the damage from excessive light absorption by curling its leaves; however, Oreocharis cordatula can spread the excessive energy by heat dissipation through photoprotection of PS Ⅱ, thus protecting its photosynthesis organs.]]> 2022/3/3 16:55:12 1,3, WANG Dandan^2,3, LI Weiqi^3*]]> LI Aihua^1,3, WANG Dandan^2,3, LI Weiqi^3* 3true Oreocharis, Primulina, Petrocodon and Paraboea, which have high species diversity and regional specificity. This study can provide a theoretical reference for the conservation and sustainable utilization of Gesneriaceae plant resources in Guizhou Province.]]> 2022/3/3 16:55:12 *]]> HUANG Mei, LI Meijun, HUANG Hong, ZHANG Jinquan, BAI Xinxiang^* 2true Oreocharis, Primulina, Petrocodon and Paraboea, which have high species diversity and regional specificity. This study can provide a theoretical reference for the conservation and sustainable utilization of Gesneriaceae plant resources in Guizhou Province.]]> 2022/3/3 16:55:12 *]]> HUANG Mei, LI Meijun, HUANG Hong, ZHANG Jinquan, BAI Xinxiang^* 1true