Articles
STUDIES ON MEGASPOROGENESIS AND THE DEVELOPMENT OF FEMALE GAMETOPHYTES IN DIPLOID AND AUTOTETRAPLOID BROCCOLI
Article number
932_1
Pages
19 – 22
Language
English
Abstract
Traditional paraffin sectioning was used to observe the development of megaspore and female gametophytes of diploid and autotetraploid broccoli.
The results indicated that the ovary has two carpels, two locular, parietal placenta and one series of ovules per locule.
The development of the embryo sac was of the olygonum type.
The mature ovules were campylotropous with dual-integuments
and crassinu- cellate.
The single archesporial cell functions directly as megaspore mother cell.
The later undergoes meiotic divisions and develops into a linear tetrad.
The megaspore at the chalazal end became a functional megaspore.
There were eight nuclei in the mature embryo sac.
Embryo sac development of autotetraploid broccoli was normal and similar with that of diploid.
A total of 53.1 and 50.5% of the ovules can develop into mature embryo sac in the diploid and autotetraploid broccoli, respectively.
The results indicated that the ovary has two carpels, two locular, parietal placenta and one series of ovules per locule.
The development of the embryo sac was of the olygonum type.
The mature ovules were campylotropous with dual-integuments
and crassinu- cellate.
The single archesporial cell functions directly as megaspore mother cell.
The later undergoes meiotic divisions and develops into a linear tetrad.
The megaspore at the chalazal end became a functional megaspore.
There were eight nuclei in the mature embryo sac.
Embryo sac development of autotetraploid broccoli was normal and similar with that of diploid.
A total of 53.1 and 50.5% of the ovules can develop into mature embryo sac in the diploid and autotetraploid broccoli, respectively.
Authors
Jun-xing Li, Shu-ning Zhang, Ying Li, Cheng Zhong, Shi-jun Li
Keywords
Brassica oleracea L. var. italica
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