Research on germination strategies has been proposed as a tool for understanding the evolutionary patterns of plant species living in extreme climate conditions. Previous research has concentrated on spring-germinated...Research on germination strategies has been proposed as a tool for understanding the evolutionary patterns of plant species living in extreme climate conditions. Previous research has concentrated on spring-germinated plants, while there has been little investigation on the ecological significance of ephemeral plants that germinate in both autumn and spring. The biological characteristics and life history strategies of autumn-and spring-germinated plants of Hypecoum erectum L. that belongs to Hypecoum in Papaveraceae family in the southern part of the Gurbantunggut Desert, China, were investigated from 2016 to 2017. Results showed that:(1) the interval from seedling emergence to the end of the life cycle in autumn-germinated plants(202–208 d) was significantly longer than that in spring-germinated plants(53–65 d);(2) the height, crown, principal axis and the number of leaves of autumn-germinated plants were much greater than those of spring-germinated plants;(3) allocation of dry mass to reproduction was 30.24%(±2.41%) and 10.12%(±0.68%) in autumn-and spring-germinated plants, respectively. Autumn-germinated seedlings of H. erectum had an advantage in avoiding the competition between annual and perennial herbs that had longer periods of vegetative growth.Spring-germinated seedlings need to ensure the survival of population when only a fewer autumn-germinated seedlings successfully overwinter. In an unpredictable environment, the germination strategy of bet hedging not only utilizes the resources and reduces the competition intensity in offspring,but also ensures the survival of the plant population.展开更多
A new xanthone, 1,2-dihydro-3,6,8-trihydroxy-1,1-bis (3-methylbut -2-enyl)-5-(1, 1-dimethylprop-2-enyl)xanthen-2,9-dione (1), has been isolated from the aerial part of Hypericum erectum.
利用HPLC/DAD-ESI(-)MS联用技术对植物长萼小连翘(Hypericum erectum subsp. longisepalum L. H. Wu et D. P. Yang)中主要化学成分进行了分离分析,初步鉴定出金丝桃素、伪金丝桃素、原伪金丝桃素、绿原酸、芦丁、金丝桃苷、槲皮素等12...利用HPLC/DAD-ESI(-)MS联用技术对植物长萼小连翘(Hypericum erectum subsp. longisepalum L. H. Wu et D. P. Yang)中主要化学成分进行了分离分析,初步鉴定出金丝桃素、伪金丝桃素、原伪金丝桃素、绿原酸、芦丁、金丝桃苷、槲皮素等12种黄酮类、酚酸类和金丝桃素类等化学成分。展开更多
本文报道囊梗孢属一新种和一中国新记录种。新种为直立囊梗孢Oncopodium erectum G. Z. Zhao & T. Y. Zhang, 其典型特征是分生孢子宽倒棒状或梨形,砖格状, 几乎总是三个横膈膜。中国新记录种为李囊梗孢Oncopodium pruni M. B. Elli...本文报道囊梗孢属一新种和一中国新记录种。新种为直立囊梗孢Oncopodium erectum G. Z. Zhao & T. Y. Zhang, 其典型特征是分生孢子宽倒棒状或梨形,砖格状, 几乎总是三个横膈膜。中国新记录种为李囊梗孢Oncopodium pruni M. B. Ellis。对这两个种进行英文描述,并附图,新种具拉丁文描述。研究标本保存在山东农业大学植物病理学标本室(HSAUP)。展开更多
基金supported by the National Natural Science Foundation of China (31660061, 31460183, 31200417)the Corps Scientific Program Project (2015AD023)
文摘Research on germination strategies has been proposed as a tool for understanding the evolutionary patterns of plant species living in extreme climate conditions. Previous research has concentrated on spring-germinated plants, while there has been little investigation on the ecological significance of ephemeral plants that germinate in both autumn and spring. The biological characteristics and life history strategies of autumn-and spring-germinated plants of Hypecoum erectum L. that belongs to Hypecoum in Papaveraceae family in the southern part of the Gurbantunggut Desert, China, were investigated from 2016 to 2017. Results showed that:(1) the interval from seedling emergence to the end of the life cycle in autumn-germinated plants(202–208 d) was significantly longer than that in spring-germinated plants(53–65 d);(2) the height, crown, principal axis and the number of leaves of autumn-germinated plants were much greater than those of spring-germinated plants;(3) allocation of dry mass to reproduction was 30.24%(±2.41%) and 10.12%(±0.68%) in autumn-and spring-germinated plants, respectively. Autumn-germinated seedlings of H. erectum had an advantage in avoiding the competition between annual and perennial herbs that had longer periods of vegetative growth.Spring-germinated seedlings need to ensure the survival of population when only a fewer autumn-germinated seedlings successfully overwinter. In an unpredictable environment, the germination strategy of bet hedging not only utilizes the resources and reduces the competition intensity in offspring,but also ensures the survival of the plant population.
文摘A new xanthone, 1,2-dihydro-3,6,8-trihydroxy-1,1-bis (3-methylbut -2-enyl)-5-(1, 1-dimethylprop-2-enyl)xanthen-2,9-dione (1), has been isolated from the aerial part of Hypericum erectum.
文摘利用HPLC/DAD-ESI(-)MS联用技术对植物长萼小连翘(Hypericum erectum subsp. longisepalum L. H. Wu et D. P. Yang)中主要化学成分进行了分离分析,初步鉴定出金丝桃素、伪金丝桃素、原伪金丝桃素、绿原酸、芦丁、金丝桃苷、槲皮素等12种黄酮类、酚酸类和金丝桃素类等化学成分。
文摘本文报道囊梗孢属一新种和一中国新记录种。新种为直立囊梗孢Oncopodium erectum G. Z. Zhao & T. Y. Zhang, 其典型特征是分生孢子宽倒棒状或梨形,砖格状, 几乎总是三个横膈膜。中国新记录种为李囊梗孢Oncopodium pruni M. B. Ellis。对这两个种进行英文描述,并附图,新种具拉丁文描述。研究标本保存在山东农业大学植物病理学标本室(HSAUP)。
