Výsledky vyhledávání

Apomixis and heterogamy in rose rootstocks (Rosa canina L.)

Autor: G. H. Kroon, A. E. Zeilinga

Publikováno v: Euphytica. 23:345-352

A study was made of the occurrence of apomixis and heterogamy in rose rootstocks belonging to the Caninae. Of several ‘Edelcanina’-selections progenies obtained from crossings with wild roses or from self- and open pollinations were analysed morp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ba9b0099666f496dc92e352959a8daa5
https://doi.org/10.1007/bf00035877

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Chromosome numbers of Tulipa species and the occurrence of hexaploidy

Autor: M. C. Jongerius, G. H. Kroon

Publikováno v: Euphytica. 35:73-76

Chromosome numbers of Tulipa species were determined. For the first time hexaploidy was found in the genus. It became clear that in many species or subspecies several ploidy levels may occur.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ee4bfaf9ba018a61c95fa7c41d4e8ae2
https://doi.org/10.1007/bf00028543

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POLYPLOIDY IN COTONEASTER II

Autor: G. H. Kroon

Publikováno v: Acta Botanica Neerlandica. 24:417-420

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6fb40f1e7fb85d71a683b409d7441db4
https://doi.org/10.1111/j.1438-8677.1975.tb01032.x

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Interspecific hybridization in Cucumis (L.). I. Need for genetic variation, biosystematic relations and possibilities to overcome crossability barriers

Autor: J.B.M. Custers, Y. O. Kho, A.P.M. den Nijs, G. H. Kroon, H. Q. Varekamp

Publikováno v: Euphytica, 28, 723-728
Euphytica 28 (1979)

The genetic variation in pickling and slicing cucumbers (C. sativus L.) seems insufficient to enable the breeder to solve serious cultivation problems. Wild allies of C. sativus possess a wide range of interesting characters which could be incorporat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::274def935a39f1a44e10db7de3926338
https://doi.org/10.1007/bf00038940

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Osmotic Shock as a Prerequisite to Pollen Digestion in the Alimentary Tract of the Worker Honeybee

Autor: Hayo H. W. Velthuis, J. P. van Praagh, G. H. Kroon

Publikováno v: Journal of Apicultural Research. 13:177-181

SummarySome observations are reported suggesting that, in the worker honeybee, a difference in osmotic pressure between the contents of the honey sac and ventriculus causes pollen grains to burst during their passage through the alimentary tract. Nei

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bf5c2e6f842d49f8fb0d03d675c350b5
https://doi.org/10.1080/00218839.1974.11099776

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SOME ASPECTS OF THE POLLINATION MECHANISM OF VIOLA TRICOLOR L. AND VIOLA X WITTROCKIANA GAMS

Autor: G. H. Kroon

Publikováno v: Acta Botanica Neerlandica. 21:630-632

SUMMARY Pollination experiments on garden pansies (V. X wittrockiana Gams) and V. tricolor L. have shown that the assumption of earlier investigators that the stigmatic cavity is closed, is incorrect. The flower morphology is described especially in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12d3fe3e39b04ea47618532011a60429
https://doi.org/10.1111/j.1438-8677.1972.tb00222.x

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