The relationship of three Brachionus calyciflorus morphotypes （two short-spined, single-spined and spineless ones） was studied in the laboratory. Newly hatched females of each morphotype were cultured individually i...The relationship of three Brachionus calyciflorus morphotypes （two short-spined, single-spined and spineless ones） was studied in the laboratory. Newly hatched females of each morphotype were cultured individually in an inorganic or Asplanchna-conditioned mediums, and the morphotype of their offspring were checked at 200 x magnification. Females of each morphotype, cultured in the inorganic medium, could produce offspring of these three morphotypes in a single generation. Females of all three morphotyes could respond to specific Asplanchna-substances when they were cultured in Asplanchna-conditioned medium. Moreover, we observed that these three morphotype females could coexist in the medium and had three types of egg-bearing females. Based on the above observations we suggest that B. calyciflorus was a morphotype complex and has three basic morphotypes.展开更多
Comparative studies of the biochemical parameters of the leaves and seeds of Moringa oleifera was carried out to provide additional information on the nutritional status of the leaf and seed of M, oleifera. The vegeta...Comparative studies of the biochemical parameters of the leaves and seeds of Moringa oleifera was carried out to provide additional information on the nutritional status of the leaf and seed of M, oleifera. The vegetative and floral characters of the plants collected were examined, floral diagram and formular were recorded. Protein variation in the dry seed and leaf is an indication of protein polymorphism and this depicts the genetic divergence in the leaf and seed ofM. oleifera. Protein bands at 0.4, 1.1, 3.9 and 5.8 are taxonomically distinct, thus diagnostically separated the dry seed from other samples. Proximate analysis shows that the dry samples are more nutritious than the wet samples.展开更多
Aims Sexual dimorphism is a common trait in plants with sex separation,which could influence female and male functions differently.In a subdioecious population of Dasiphora glabra on the Qinghai-Tibet Plateau,we inves...Aims Sexual dimorphism is a common trait in plants with sex separation,which could influence female and male functions differently.In a subdioecious population of Dasiphora glabra on the Qinghai-Tibet Plateau,we investigated sexual dimorphism of floral traits and their effects on pollinator visitation,pollen flow and seed production.We also examined differences in genome size of hermaphroditic and dioecious plants.Methods We examined sexual dimorphism in flower number,flower size,and pollen and ovule production in a subdioecious population of D.glabra.We compared pollinator visitation,pollen dispersal and seed production between sexes.We also examined the genome size of three sex morphs using flow cytometry.Important Findings The number of hermaphroditic plants was significantly more than that of male and female plants,and dioecious plants accounted for ca.40%in the study population.Hermaphroditic plants produced significantly more flowers than male and female plants.Flower size of male flowers was significantly larger than that of female and hermaphroditic flowers.Male flowers did not produce more pollen grains than hermaphroditic flowers,but female flowers produced more ovules than hermaphroditic flowers.Flies were the most frequent flower visitors and preferred large flowers,but their movements between flowers did not show any preference to large flowers.Simulated pollen flows suggested that effective pollen transfer was generally low for both hermaphroditic and male flowers,corresponding to the low seed set of naturally pollinated flowers.DNA contents of male and female plants were ca.four times than those of hermaphroditic plants.These results suggest male and female individuals have undergone polyploidy events and thus are not compatible with hermaphroditic individuals.Sexual dimorphism in floral traits in relation to pollination of dioecious plants might show an advantage in female and male functions,but this advantage is masked largely by low effectiveness of pollen transfer.展开更多
文摘The relationship of three Brachionus calyciflorus morphotypes （two short-spined, single-spined and spineless ones） was studied in the laboratory. Newly hatched females of each morphotype were cultured individually in an inorganic or Asplanchna-conditioned mediums, and the morphotype of their offspring were checked at 200 x magnification. Females of each morphotype, cultured in the inorganic medium, could produce offspring of these three morphotypes in a single generation. Females of all three morphotyes could respond to specific Asplanchna-substances when they were cultured in Asplanchna-conditioned medium. Moreover, we observed that these three morphotype females could coexist in the medium and had three types of egg-bearing females. Based on the above observations we suggest that B. calyciflorus was a morphotype complex and has three basic morphotypes.
文摘Comparative studies of the biochemical parameters of the leaves and seeds of Moringa oleifera was carried out to provide additional information on the nutritional status of the leaf and seed of M, oleifera. The vegetative and floral characters of the plants collected were examined, floral diagram and formular were recorded. Protein variation in the dry seed and leaf is an indication of protein polymorphism and this depicts the genetic divergence in the leaf and seed ofM. oleifera. Protein bands at 0.4, 1.1, 3.9 and 5.8 are taxonomically distinct, thus diagnostically separated the dry seed from other samples. Proximate analysis shows that the dry samples are more nutritious than the wet samples.
基金by Natural Science Foundation of China(31570385).
文摘Aims Sexual dimorphism is a common trait in plants with sex separation,which could influence female and male functions differently.In a subdioecious population of Dasiphora glabra on the Qinghai-Tibet Plateau,we investigated sexual dimorphism of floral traits and their effects on pollinator visitation,pollen flow and seed production.We also examined differences in genome size of hermaphroditic and dioecious plants.Methods We examined sexual dimorphism in flower number,flower size,and pollen and ovule production in a subdioecious population of D.glabra.We compared pollinator visitation,pollen dispersal and seed production between sexes.We also examined the genome size of three sex morphs using flow cytometry.Important Findings The number of hermaphroditic plants was significantly more than that of male and female plants,and dioecious plants accounted for ca.40%in the study population.Hermaphroditic plants produced significantly more flowers than male and female plants.Flower size of male flowers was significantly larger than that of female and hermaphroditic flowers.Male flowers did not produce more pollen grains than hermaphroditic flowers,but female flowers produced more ovules than hermaphroditic flowers.Flies were the most frequent flower visitors and preferred large flowers,but their movements between flowers did not show any preference to large flowers.Simulated pollen flows suggested that effective pollen transfer was generally low for both hermaphroditic and male flowers,corresponding to the low seed set of naturally pollinated flowers.DNA contents of male and female plants were ca.four times than those of hermaphroditic plants.These results suggest male and female individuals have undergone polyploidy events and thus are not compatible with hermaphroditic individuals.Sexual dimorphism in floral traits in relation to pollination of dioecious plants might show an advantage in female and male functions,but this advantage is masked largely by low effectiveness of pollen transfer.
