Aims Rhodiola dumulosa is a perennial herb growing in a naturally fragmented habitat of high-mountain rocks.This research aims to(i)investigate the mating system characteristics and pollination biology of R.dumulosa,(...Aims Rhodiola dumulosa is a perennial herb growing in a naturally fragmented habitat of high-mountain rocks.This research aims to(i)investigate the mating system characteristics and pollination biology of R.dumulosa,(ii)study the effects of ecological factors on the mating system and pollination biology of R.dumulosa and(iii)assess the relationship between its pollination and mating system.Methods Mating system parameters were analysed using allozyme markers.Growth of pollen tubes from artificial self-and cross-pollination was also examined.Field investigations were conducted on insect flower visitation during the blooming period of R.dumulosa.Relationships among mating system,insect flower visitation frequency and environmental factors were assessed.Important Findings The results showed that(i)R.dumulosa has a mixed-mating system:it is self-compatible and primarily outbreeding,with the multilocus outcrossing rate(tm)ranging from 0.58960.078(6 standard deviation)to 0.84660.077;inbreeding coefficients of maternal parents(F)were zero,indicating that inbreeding depression was intense.(ii)Light intensity and temperature impacted the visitation of the principal pollinators,the syrphid Eristalis tenax and the bumblebee Bombus pyrosoma.(iii)Population size plays an important role in the mating system and pollination.Populations received more frequent visits by the principal pollinators usually had higher outcrossing rates.Pollination to some extent affects the mating system of R.dumulosa and it is important to maintain large populations to prevent further inbreeding and to maintain pollinators to facilitate outcrossing.展开更多
Objective:As a medicinal plant,the resource of Rhodiola dumulosa is deficient along with the large collection.For the protection and utilization of R.dumulosa,the influence of plant growth regulators(PGRs)on callus in...Objective:As a medicinal plant,the resource of Rhodiola dumulosa is deficient along with the large collection.For the protection and utilization of R.dumulosa,the influence of plant growth regulators(PGRs)on callus induction and adventitious shoots differentiation,polysaccharide production and the antioxidant activity were tested.Methods:Internodes of R.dumulosa were used as explants and cultured on MS medium plus different plant growth regulators(PGRs).The anti-oxidative activities of polysaccharides were evaluated using radical scavenging assays.Results:By response surface plot,0.85 mg/L N6-benzyladenine(BA),0.34 mg/L naphthaleneacetic acid(NAA)and 0.33 mg/L 2,4-dicholorophenoxyacetic acid(2,4-D)were the optimal factors for callus induction(90.03%)from internodes explants on MS medium.The fresh weight of green callus increased 47.26 fold,when callus was inoculated on MS+thidiazuron(TDZ)0.5 mg/L+NAA 2.0 mg/L.Adventitious buds regenerated from callus on the media of MS were fortified with BA 1.0 mg/L plus NAA 0.5 mg/L,and the induction rate was 40.00%.MS plus indole-3-butyric acid(IBA)1.0 mg/L produced the highest rooting rate with 10 to 15 roots in a length of 2–3 cm per shoot.The content of total polysaccharides in callus developed on MS+TDZ 0.5 mg/L+NAA 2.0 mg/L and MS+BA 1.0 mg/L+NAA 0.5 mg/L was as high as 1.72%2.15%.At the dose of 0.5 mg/mL polysaccharides extracted from different callus induced on MS+NAA 2.0 mg/L+TDZ 0.5 mg/L or MS+BA 1.0 mg/L+NAA 0.5 mg/L or MS+BA 0.5 mg/L+2,4-D 0.5 mg/L,the ABTS radical eliminating percentages were 82.78%,80.18%and 68.59%,respectively,much higher than that of wild plant.Conclusion:A rapid micropropagation system for R.dumulosa has been developed.The combination of TDZ and NAA or BA and NAA can increase the yield of the total polysaccharides.The polysaccharides isolated from callus and whole wild plants had stronger free radicals scavenging activities,indicating that polysaccharides from R.dumulosa are the potential pharmaceutical supplements.展开更多
研究了红景天属小丛红景天根茎的化学成分,从乙酸乙酯部分得到5个化合物:分别是胡萝卜苷(β-si-tosterol glucoside,Ⅰ),大黄酚-8-O-β-D-葡萄糖苷(chrysophanol-8-O-β-D-glucopyranoside,Ⅱ),草质素-7-O-α-L-鼠李糖苷(rhod ion in,...研究了红景天属小丛红景天根茎的化学成分,从乙酸乙酯部分得到5个化合物:分别是胡萝卜苷(β-si-tosterol glucoside,Ⅰ),大黄酚-8-O-β-D-葡萄糖苷(chrysophanol-8-O-β-D-glucopyranoside,Ⅱ),草质素-7-O-α-L-鼠李糖苷(rhod ion in,Ⅲ),大花红景天苷(crenu loside,Ⅳ),草质素-7-O-(3″-β-D-葡萄糖基)-α-L-鼠李糖苷[herbacetin-7-O-(3″-β-D-glucopyranosyl)-α-L-rhamnoside,Ⅴ]。化合物大花红景天苷和大黄酚-8-O-β-D-葡萄糖苷为首次从该植物中分离得到,其中大黄酚-8-O-β-D-葡萄糖苷为首次从该属植物中分离得到。展开更多
基金National Natural Science Foundation of China(30770356).
文摘Aims Rhodiola dumulosa is a perennial herb growing in a naturally fragmented habitat of high-mountain rocks.This research aims to(i)investigate the mating system characteristics and pollination biology of R.dumulosa,(ii)study the effects of ecological factors on the mating system and pollination biology of R.dumulosa and(iii)assess the relationship between its pollination and mating system.Methods Mating system parameters were analysed using allozyme markers.Growth of pollen tubes from artificial self-and cross-pollination was also examined.Field investigations were conducted on insect flower visitation during the blooming period of R.dumulosa.Relationships among mating system,insect flower visitation frequency and environmental factors were assessed.Important Findings The results showed that(i)R.dumulosa has a mixed-mating system:it is self-compatible and primarily outbreeding,with the multilocus outcrossing rate(tm)ranging from 0.58960.078(6 standard deviation)to 0.84660.077;inbreeding coefficients of maternal parents(F)were zero,indicating that inbreeding depression was intense.(ii)Light intensity and temperature impacted the visitation of the principal pollinators,the syrphid Eristalis tenax and the bumblebee Bombus pyrosoma.(iii)Population size plays an important role in the mating system and pollination.Populations received more frequent visits by the principal pollinators usually had higher outcrossing rates.Pollination to some extent affects the mating system of R.dumulosa and it is important to maintain large populations to prevent further inbreeding and to maintain pollinators to facilitate outcrossing.
基金This study was financially supported by the Independent Research Project of Graduate Students(No.BZKY2021035).
文摘Objective:As a medicinal plant,the resource of Rhodiola dumulosa is deficient along with the large collection.For the protection and utilization of R.dumulosa,the influence of plant growth regulators(PGRs)on callus induction and adventitious shoots differentiation,polysaccharide production and the antioxidant activity were tested.Methods:Internodes of R.dumulosa were used as explants and cultured on MS medium plus different plant growth regulators(PGRs).The anti-oxidative activities of polysaccharides were evaluated using radical scavenging assays.Results:By response surface plot,0.85 mg/L N6-benzyladenine(BA),0.34 mg/L naphthaleneacetic acid(NAA)and 0.33 mg/L 2,4-dicholorophenoxyacetic acid(2,4-D)were the optimal factors for callus induction(90.03%)from internodes explants on MS medium.The fresh weight of green callus increased 47.26 fold,when callus was inoculated on MS+thidiazuron(TDZ)0.5 mg/L+NAA 2.0 mg/L.Adventitious buds regenerated from callus on the media of MS were fortified with BA 1.0 mg/L plus NAA 0.5 mg/L,and the induction rate was 40.00%.MS plus indole-3-butyric acid(IBA)1.0 mg/L produced the highest rooting rate with 10 to 15 roots in a length of 2–3 cm per shoot.The content of total polysaccharides in callus developed on MS+TDZ 0.5 mg/L+NAA 2.0 mg/L and MS+BA 1.0 mg/L+NAA 0.5 mg/L was as high as 1.72%2.15%.At the dose of 0.5 mg/mL polysaccharides extracted from different callus induced on MS+NAA 2.0 mg/L+TDZ 0.5 mg/L or MS+BA 1.0 mg/L+NAA 0.5 mg/L or MS+BA 0.5 mg/L+2,4-D 0.5 mg/L,the ABTS radical eliminating percentages were 82.78%,80.18%and 68.59%,respectively,much higher than that of wild plant.Conclusion:A rapid micropropagation system for R.dumulosa has been developed.The combination of TDZ and NAA or BA and NAA can increase the yield of the total polysaccharides.The polysaccharides isolated from callus and whole wild plants had stronger free radicals scavenging activities,indicating that polysaccharides from R.dumulosa are the potential pharmaceutical supplements.
文摘研究了红景天属小丛红景天根茎的化学成分,从乙酸乙酯部分得到5个化合物:分别是胡萝卜苷(β-si-tosterol glucoside,Ⅰ),大黄酚-8-O-β-D-葡萄糖苷(chrysophanol-8-O-β-D-glucopyranoside,Ⅱ),草质素-7-O-α-L-鼠李糖苷(rhod ion in,Ⅲ),大花红景天苷(crenu loside,Ⅳ),草质素-7-O-(3″-β-D-葡萄糖基)-α-L-鼠李糖苷[herbacetin-7-O-(3″-β-D-glucopyranosyl)-α-L-rhamnoside,Ⅴ]。化合物大花红景天苷和大黄酚-8-O-β-D-葡萄糖苷为首次从该植物中分离得到,其中大黄酚-8-O-β-D-葡萄糖苷为首次从该属植物中分离得到。
