A light microscopy study about sporogenesis and gametogenesis of the natural hybrid Drosera x obovata and its parental species (D. rotundifolia and D. anglica) was carried out. Even though D. x obovata and its parents have been investigated cytologically in detail during the past century and a “Drosera scheme” for pairing of chromosomes has been described, there are no data about sporogenesis and gametogenesis of the European sundews. We report a morphological description of the ovule and pollen development in D. x obovata and its parents. D. x obovata, even if sterile, produces a male and a female gametophyte, structurally the same as that of its parents. However, its pollen grains have a reduced number of protoplasmic papillae, which indicates low vitality, whereas in the ovule it has never been possible to observe an embryo. Hybridization is considered as a mechanism for speciation in some Drosera as proved by the hybrid origins of several species.
Ovule and pollen development in the natural hybrid Drosera x obovata Mert. & Koch (Droseraceae) and its parents / G. Rodondi, M. Beretta, C. Andreis. - In: FLORA. - ISSN 0367-2530. - 204:9(2009), pp. 685-691. [10.1016/j.flora.2008.10.001]
Ovule and pollen development in the natural hybrid Drosera x obovata Mert. & Koch (Droseraceae) and its parents
G. RodondiPrimo
;M. BerettaSecondo
;C. AndreisUltimo
2009
Abstract
A light microscopy study about sporogenesis and gametogenesis of the natural hybrid Drosera x obovata and its parental species (D. rotundifolia and D. anglica) was carried out. Even though D. x obovata and its parents have been investigated cytologically in detail during the past century and a “Drosera scheme” for pairing of chromosomes has been described, there are no data about sporogenesis and gametogenesis of the European sundews. We report a morphological description of the ovule and pollen development in D. x obovata and its parents. D. x obovata, even if sterile, produces a male and a female gametophyte, structurally the same as that of its parents. However, its pollen grains have a reduced number of protoplasmic papillae, which indicates low vitality, whereas in the ovule it has never been possible to observe an embryo. Hybridization is considered as a mechanism for speciation in some Drosera as proved by the hybrid origins of several species.Pubblicazioni consigliate
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