In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon ...In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon cultivated in the pots were selected as materials to study their drought-resistance by analyzing the indexes such as the leaf area index, the drying roots accumulation, the holding water ability of leaf, the relative conductance of leaf, the soluble protein, chlorophyll. At the same time, by comparing with membership function value of each index, the order of each grass drought-resistance was decided. The results showed that the drought-resistance of Erioophorum comosum nees was stronger than Cynodon dactylon and drought-resistance of Cynodon dactylon was stronger than Pogonatherum panideum （Lam.） Hack. The purpose of the experimental results was to find theoretical foundations for selecting and cultivating native protecting-slope vegetations to adapt to rocky slopes.展开更多
本文报导金发草属Pogonatherum Beauv.中1新种,即二芒金发草P.biaristatum S.L.Chen et G.Y.Sheng及觿茅属Dimeria R.Br.中2新种,即异花觿茅D.heterantha S.L.Chen et G.Y.Sheng及广西觿茅D.guangxiensis S.L.Chen et G.Y.Sheng.
采用ISSR标记技术对四川、云南、重庆、广西等地不同环境条件下22个金发草种群的遗传变异进行分析。从100条引物中筛选出14条引物进行PCR扩增,共扩增出239条清晰的条带,其中227条条带具有多态性,多态位点百分率(PPB)达94.98%,金发草的...采用ISSR标记技术对四川、云南、重庆、广西等地不同环境条件下22个金发草种群的遗传变异进行分析。从100条引物中筛选出14条引物进行PCR扩增,共扩增出239条清晰的条带,其中227条条带具有多态性,多态位点百分率(PPB)达94.98%,金发草的观测等位基因数(Na)、有效等位基因数(Ne)、Ne i s的基因多样性(H)和Shannnon s信息指数(I)分别为1.9498±0.2188、1.4298±0.3204,0.2656±0.1592及0.4136±0.2088,揭示了金发草具有丰富的遗传多样性。根据Ne i s遗传距离对22个种群进行UPGMA聚类,表明金发草种群的遗传距离与其水平地理距离和垂直地理距离有关。M antel检验表明金发草种群间的遗传距离与水平地理距离和垂直地理距离均呈显著正相关(P<0.01),随着海拔升高,金发草的遗传多样性降低,推测可能是高海拔地区气温低、降水量大在一定程度上影响了金发草种群间的基因交流。生境类型、海拔高度、土壤类型、土壤pH、年均温度、年均降水量、年均日照时数等环境因子对金发草的遗传分化在一定程度上产生了影响,相关性分析表明,其影响均不显著,说明金发草种群对环境依赖性小,能分布在各种生境中,使其具有较高的遗传多样性水平。展开更多
在静置液体培养和振荡液体培养方式下,研究了聚乙二醇(PEG)胁迫对金发草[Pogona the rumpaniceum(Lam.)Hack]愈伤组织的再生能力和游离脯氨酸(F-Pro)积累的影响。发现金发草愈伤组织具有较高的耐PEG胁迫能力,培养方式与PEG胁迫对其再生...在静置液体培养和振荡液体培养方式下,研究了聚乙二醇(PEG)胁迫对金发草[Pogona the rumpaniceum(Lam.)Hack]愈伤组织的再生能力和游离脯氨酸(F-Pro)积累的影响。发现金发草愈伤组织具有较高的耐PEG胁迫能力,培养方式与PEG胁迫对其再生抑制上存在时间与程度两个方面的表现。振荡培养方式主要表现为延迟再生时间,而PEG胁迫则主要表现为降低再生频率。两种培养方式都能使愈伤组织在PEG胁迫下发生F-Pro积累,F-Pro含量随PEG浓度的增加和培养时间的增长而升高。去胁迫后,大部分愈伤组织都能够恢复再生能力,F-Pro可能在抑制和恢复过程中作用较复杂。因此,在利用愈伤组织筛选抗旱植株时,PEG浓度应在300g.L-1以上,处理时间3周以上,静置培养更有利于抗旱突变体的筛选。展开更多
基金The National Technologies Research and Development Program in the 10th Five-Year Plan of China(2001ba606a-6).
文摘In this experiment, using the methods of drought-stress in the pot and PEG simulative drought-stress, three native rocky-slope grasses Pogonatherum panideum（Lam.） Hack, Erioophorum comosum nees and Cynodon dactylon cultivated in the pots were selected as materials to study their drought-resistance by analyzing the indexes such as the leaf area index, the drying roots accumulation, the holding water ability of leaf, the relative conductance of leaf, the soluble protein, chlorophyll. At the same time, by comparing with membership function value of each index, the order of each grass drought-resistance was decided. The results showed that the drought-resistance of Erioophorum comosum nees was stronger than Cynodon dactylon and drought-resistance of Cynodon dactylon was stronger than Pogonatherum panideum （Lam.） Hack. The purpose of the experimental results was to find theoretical foundations for selecting and cultivating native protecting-slope vegetations to adapt to rocky slopes.
文摘本文报导金发草属Pogonatherum Beauv.中1新种,即二芒金发草P.biaristatum S.L.Chen et G.Y.Sheng及觿茅属Dimeria R.Br.中2新种,即异花觿茅D.heterantha S.L.Chen et G.Y.Sheng及广西觿茅D.guangxiensis S.L.Chen et G.Y.Sheng.
文摘采用ISSR标记技术对四川、云南、重庆、广西等地不同环境条件下22个金发草种群的遗传变异进行分析。从100条引物中筛选出14条引物进行PCR扩增,共扩增出239条清晰的条带,其中227条条带具有多态性,多态位点百分率(PPB)达94.98%,金发草的观测等位基因数(Na)、有效等位基因数(Ne)、Ne i s的基因多样性(H)和Shannnon s信息指数(I)分别为1.9498±0.2188、1.4298±0.3204,0.2656±0.1592及0.4136±0.2088,揭示了金发草具有丰富的遗传多样性。根据Ne i s遗传距离对22个种群进行UPGMA聚类,表明金发草种群的遗传距离与其水平地理距离和垂直地理距离有关。M antel检验表明金发草种群间的遗传距离与水平地理距离和垂直地理距离均呈显著正相关(P<0.01),随着海拔升高,金发草的遗传多样性降低,推测可能是高海拔地区气温低、降水量大在一定程度上影响了金发草种群间的基因交流。生境类型、海拔高度、土壤类型、土壤pH、年均温度、年均降水量、年均日照时数等环境因子对金发草的遗传分化在一定程度上产生了影响,相关性分析表明,其影响均不显著,说明金发草种群对环境依赖性小,能分布在各种生境中,使其具有较高的遗传多样性水平。
文摘在静置液体培养和振荡液体培养方式下,研究了聚乙二醇(PEG)胁迫对金发草[Pogona the rumpaniceum(Lam.)Hack]愈伤组织的再生能力和游离脯氨酸(F-Pro)积累的影响。发现金发草愈伤组织具有较高的耐PEG胁迫能力,培养方式与PEG胁迫对其再生抑制上存在时间与程度两个方面的表现。振荡培养方式主要表现为延迟再生时间,而PEG胁迫则主要表现为降低再生频率。两种培养方式都能使愈伤组织在PEG胁迫下发生F-Pro积累,F-Pro含量随PEG浓度的增加和培养时间的增长而升高。去胁迫后,大部分愈伤组织都能够恢复再生能力,F-Pro可能在抑制和恢复过程中作用较复杂。因此,在利用愈伤组织筛选抗旱植株时,PEG浓度应在300g.L-1以上,处理时间3周以上,静置培养更有利于抗旱突变体的筛选。
