Are obligatory apomicts invested in the pollen tube transmitting tissue? : comparison of the micropyle ultrastructure between sexual and apomictic dandelions (Asteraceae, Lactuceae)
PBN-AR
Instytucja
Wydział Przyrodniczy (Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Protoplasma
ISSN
0033-183X
EISSN
1615-6102
Wydawca
Springer
DOI
Rok publikacji
2015
Numer zeszytu
5
Strony od-do
1325-1333
Numer tomu
252
Identyfikator DOI
Liczba arkuszy
0,4
Autorzy
(liczba autorów: 6)
Pozostali autorzy
+ 5
Słowa kluczowe
PL
Apomiksja,
Astrowate,
Mniszek lekarski,
Rozwój embrionalny,
Rozmnażanie roślin,
Zalążek (bot.)
Streszczenia
Język
EN
Treść
With the exception of the sunflower, little information concerning the micropyle ultrastructure of the family Asteraceae is available. The aim of our study was to compare the micropyle structure in amphimictic and apomictic dandelions. Ultrastructural studies using buds and flowers during anthesis have been done on the micropyle of the sexual and apomictic Taraxacum. In all of the species that were examined, the micropylar canal was completely filled with ovule transmitting tissue and the matrix that was produced by these cells. The ovule transmitting tissue was connected to the ovarian transmitting tissue. The micropyle was asymmetrical because the integument epidermis that forms the transmitting tissue was only on the funicular side. There was a cuticle between the obturator cells and epidermal cells on the other side of integument. The micropylar transmitting tissue cells and theirs matrix reached the synergid apex. The cytoplasm of the transmitting tissue cells was especially rich in rough endoplasmic reticulum (ER), dictyosomes, and mitochondria. No major differences were detected between the micropyle structure of the amphimictic and apomictic species; thus, a structural reduction of obturator does not exist. The ovule transmitting tissue is still active in apomictic dandelions despite the presence of the embryo and endosperm. Differences and similarities between the micropyle structure in the Asteraceae that have been studied to date are discussed.
Cechy publikacji
oryginalny artykuł naukowy
Inne
System-identifier
0272601417026
CrossrefMetadata from Crossref logo
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