The occurrence of phenotypically complementary apomixis-recombinants in crosses between sexual and apomictic dandelions (Taraxacum officinale)

TY - JOUR

T1 - The occurrence of phenotypically complementary apomixis-recombinants in crosses between sexual and apomictic dandelions (Taraxacum officinale)

AU - Van Dijk, P.J.

AU - Van Baarlen, P.

AU - De Jong, J.H.

N1 - Reporting year: 2003 Metis note: 3136; CTE; PVP; file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs2003/VanDijk_ea_3136.pdf

PY - 2003

Y1 - 2003

N2 - Apomictic seed development in dandelion (Taraxacum officinale) involves (1) restitutional meiosis (diplospory), (2) egg cell parthenogenesis, and (3) autonomous endosperm development. The question is whether these elements of apomixis are controlled by one single gene or by several independent genes. Five triploid non-apomictic hybrids, obtained in diploid sexual x triploid apomict crosses were characterized using cyto-embryological and genetic methods. Nomarski-differential interference contrast microscopy and the transmission of microsatellite markers and ploidy levels indicated that the hybrids combined elements of the apomictic and the sexual developmental pathway. Hybrids form two complementary groups with respect to the presence or absence of parthenogenesis and autonomous endosperm development. The occurrence of complementary apomixis-recombinants suggests that parthenogenesis and autonomous endosperm development in Taraxacum are regulated independently by different genes. This study also indicates that early embryo development is independent of endosperm formation, but that endosperm is essential for later embryo growth [KEYWORDS: parthenogenesis, diplospory, unreduced egg cells, autonomous endosperm]

AB - Apomictic seed development in dandelion (Taraxacum officinale) involves (1) restitutional meiosis (diplospory), (2) egg cell parthenogenesis, and (3) autonomous endosperm development. The question is whether these elements of apomixis are controlled by one single gene or by several independent genes. Five triploid non-apomictic hybrids, obtained in diploid sexual x triploid apomict crosses were characterized using cyto-embryological and genetic methods. Nomarski-differential interference contrast microscopy and the transmission of microsatellite markers and ploidy levels indicated that the hybrids combined elements of the apomictic and the sexual developmental pathway. Hybrids form two complementary groups with respect to the presence or absence of parthenogenesis and autonomous endosperm development. The occurrence of complementary apomixis-recombinants suggests that parthenogenesis and autonomous endosperm development in Taraxacum are regulated independently by different genes. This study also indicates that early embryo development is independent of endosperm formation, but that endosperm is essential for later embryo growth [KEYWORDS: parthenogenesis, diplospory, unreduced egg cells, autonomous endosperm]

KW - NIOO/CTE/PVP

U2 - 10.1007/s00497-003-0177-5

DO - 10.1007/s00497-003-0177-5

M3 - Article

SN - 0934-0882

VL - 16

SP - 71

EP - 76

JO - Sexual Plant Reproduction

JF - Sexual Plant Reproduction

IS - 2

ER -