منابع مشابه
Apomixis: Embryo Sacs and Embryos Formed without Meiosis or Fertilization in Ovules.
The term apomixis has, in the past, been used as a general term for any form of asexual reproduction in plants, including vegetative propagation. This original definition has become more restricted and now covers only those asexual reproductive processes that, paradoxically, occur in the ovule of flowering plants-the structure that has evolved to carry out female sexual reproductive functions i...
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A Holstein heifer with symptoms of dystocia was admitted in the Large Animal Clinic at the University of Tabriz. In the vaginal examination, the fetus was found at posterior presentation and by doing someobstetrical maneuvers, a male calf was delivered. An interesting phenomenon was the presence of two skinsacs in dimensions of 12 × 12 cm and 12 × 18 cm at the right and left upper cervical regi...
متن کاملPlant development: Attractive ovules
How does a pollen tube seek out and find an ovule, its ultimate goal inside the female reproductive organs of a flower? And once an ovule has been found and fertilized, how are other pollen tubes prevented from attempting the same task? These interesting questions have been posed and considered for over 100 years, and direct answers will soon be available. A structural guidance mechanism by its...
متن کاملTranscript profiles of maize embryo sacs and preliminary identification of genes involved in the embryo sac–pollen tube interaction
The embryo sac, the female gametophyte of flowering plants, plays important roles in the pollination and fertilization process. Maize (Zea mays L.) is a model monocot, but little is known about the interactions between its embryo sac and the pollen tube. In this study, we compared the transcript profiles of mature embryo sacs, mature embryo sacs 14-16 h after pollination, and mature nucelli. Co...
متن کاملIntegration of Two Diploid Potato Linkage Maps with the Potato Genome Sequence
To facilitate genome-guided breeding in potato, we developed an 8303 Single Nucleotide Polymorphism (SNP) marker array using potato genome and transcriptome resources. To validate the Infinium 8303 Potato Array, we developed linkage maps from two diploid populations (DRH and D84) and compared these maps with the assembled potato genome sequence. Both populations used the doubled monoploid refer...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 1922
ISSN: 0002-9122
DOI: 10.1002/j.1537-2197.1922.tb05666.x