Central cell degeneration leads to three-celled female gametophyte in Zeylanidium lichenoides Engl. (Podostemaceae)

Autor:	Priyanka Khanduri, Anjali Chaudhary, Prem L. Uniyal, Rajesh Tandon, H. Y. Mohan Ram
Rok vydání:	2014
Předmět:	Gametophyte Podostemaceae Egg cell biology Single fertilization Embryo Plant Science biology.organism_classification Double fertilization Podostemads medicine.anatomical_structure Botany Lichenoides medicine Female gametophyte Pollen tube Three-celled/three-nucleate embryo sac
Zdroj:	South African Journal of Botany. 91:99-106
ISSN:	0254-6299
DOI:	10.1016/j.sajb.2014.01.004
Popis:	The absence of double fertilization and lack of endosperm formation are key embryological features of Podostemaceae, which is unique among the angiosperms. Double fertilization fails in spite of the fact that two male gametes are carried in the pollen tube and the incipient embryo sac is equipped with an egg cell and a central cell. Little is known about the proximate causes of the failure of double fertilization. The female gametophyte of Zeylanidium lichenoides, (subfamily — Podostemoideae) has a monosporic mode of development resulting in an initial four-celled/four-nucleate condition. However, the central cell degenerates before the arrival of the pollen tube in the vicinity of micropyle, thus the mature and functional female gametophyte of Z. lichenoides is ontogenically a three-celled/three-nucleate structure. It is inferred that the formation of a highly reduced female gametophyte, presumably is a result of degeneration of the central cell.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::98677361a7f84b2d949cf78114229b00 https://doi.org/10.1016/j.sajb.2014.01.004 Zobrazit plný text záznamu Full Text from ScienceDirect