Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"apomixis"”.
-
Engineering apomixis in plants to stabilize intergenerational hybrid vigor
Apomixis is the production of seeds asexually in plants, whereby clonal progeny have an identical genotype as the mother plant (1). In natural apomicts, mechanisms of reproduction are very diverse but carry potential for use in agriculture. If apomixis is engineered in crops it could be used to …
-
The Ecology of Sexual and Apomictic Reproduction in Antennaria Parlinii Gaertner (Apomixis, Plant Breeding Systems, Evolution)
Differences in habitat and geographic distributions of sexually and asexually reproducing species are often attributed to differences in relative colonizing and competitive abilities. In this thesis, fitness components that influence colonizing and competitive ability are compared in an herbaceous …
-
Identificación y caracterización de genes relacionados con los cambios de ploidía y la apomixis diplospórica en Eragrostis curvula
… miembros se reproducen en forma apomí-ctica. La apomixis es una forma de reproducción asexual (agámica) a través de semillas, que conduce a la generación de progenies genéticamente idénticas a la planta madre. Ha sido descripta en más de 400 especies de angiospermas. La apomixis gametofítica …
-
Cytology, Mode of Reproduction, and Forage Quality of Selected Species of Brachiaria Griseb. (Chromosome Numbers, Fiber Structure, Pachytene Analysis, Apomixis)
… polyploids of the basic chromosome number x = 9. Apomixis is the predominant mode of reproduction within the genus. To define chromosome behavior during meiosis and mode of reproduction, a small but diverse Brachiaria collection was assembled. Species studied included: B. brizantha, B. decumbens, …
-
Weed versus wildflower : mating system ecology in a Taraxacum native-exotic contact zone
… genera capable of clonal seed production through apomixis, which are derived from ancestral sexual lineages. The evolution of apomixis and associated changes in ploidy level contributes to niche differentiation and geographic separation between closely related plant species. Incomplete …
-
Apogamia en el helecho Dryoptris affinis ssp. affinis. De la fisiología a la trancriptómica
… cuyo ciclo vital cuenta con un caso peculiar de apomixis. En concreto, se informa de un enfoque fisiológico y transcriptómico, revelando un papel de las fitohormonas, ya sea mediante el análisis de los efectos causados por la adición al medio de cultivo, o midiendo los niveles endógenos, así como …
-
Contribución al conocimiento de la taxonomía y del modo reproductivo del pasto llorón Eragrostis curvula (Scharad.) Nees
… (2n=6x=60 a 2n=8x=80) se reproducen por apomixis y son autocompatibles. También existen unos pocos facultativos. El término apomixis hace referencia a una forma de reproducción asexual a través de semillas que origina plantas genéticamente idénticas a la planta madre (clones). Estas …
-
THE FEMALE GAMETOPHYTE: DEVELOPMENT AND FUNCTION
… without sexual reproduction. One example is apomixis, where meiosis and fertilization of the egg by male gametes are by passed to result in the production of clonal progeny without a parental contribution. Apomixis is due to modifications of the sexual reproduction and it does not occur in …
-
GENETIC NETWORK CONTROLLING FEMALE GAMETOPHYTE AND EMBRYO DEVELOPMENT IN ARABIDOPSIS THALIANA
… APOSTART genes like candidate genes involved in apomixis. Apomixis is an asexual way of reproduction and avoids both meiotic reduction and egg fertilization.
-
Taxonomical use of floral scent data in apomictic taxa of Hieracium and Sorbus derived from hybridization
… fertile seeds without pollination. Overall, apomixis occurs scattered over the whole Angiosperm tree in early as well as late branching families. Rosaceae and Asteraceae are particularly rich in apomictic taxa. In these families genera such as Hieracium and Sorbus contribute a lot to local …
-
Bases fisiológicas y moleculares de la reproducción sexual y asexual en el gametofito de helechos
… ovocélula, es un caso relativamente frecuente de apomixis en pteridofitos, que se denomina apogamia porque no deriva el nuevo embrión de la ovocélula sino de otras células. Debido a su alto impacto en la agricultura, la investigación en esta línea ha incrementado sustancialmente en los últimos …
-
SEX AND DIVERSITY IN THE INVASIVE PLANT HIERACIUM AURANTIACUM
Sexual reproduction is generally thought to provide long-term fitness advantages over asexual reproduction in the form of increased genetic diversity. Some work, however, suggests that asexual reproduction can also be advantageous. One situation when asexual reproduction provides an advantage is …
-
SEX AND DIVERSITY IN THE INVASIVE PLANT HIERACIUM AURANTIACUM
Sexual reproduction is generally thought to provide long-term fitness advantages over asexual reproduction in the form of increased genetic diversity. Some work, however, suggests that asexual reproduction can also be advantageous. One situation when asexual reproduction provides an advantage is …