- 1 - 



ORNAMEUTAL PLANTS 

 Breeding 



Storrs Cytology and Genetics of Floriculture Crops , (l) 



(Conn.) Carnations , Work on effects of ionizing radiation in pro- 

 duction of mutants in existing commercial clones and new 

 seedlings* Develop analytic techniques for study of somatic 

 mutants and chimeras. Chemically study various breeding types 

 of known genotypes. Further study poljrploidy, to develop 

 diploid and tetraploid parent genotypes capable of producing 

 suitable triploids. (2) Orchids , Make further cytological 

 studies correlated with suitable cultural conditions to learn 

 what degree of ploidy is most likely to provide maximum returns 

 and best means of achieving desired degree of ploidy. Make 

 careful meiotic studies of mega- and microsporogenesis of 

 selected types to learn if orchids (not considered as being 

 parthenogenetic ) may, under certain conditions, reproduce 

 parthenogenetically, (3) Delphiniums . Test validify of results 

 of studies of origin of D. Belladonna Hort which has indicated 

 that triploids or otherwise sterile hybrids are better keepers 

 for cut flowers than fertile forms, and how these fonns can 

 most readily be produced. (A) Lilies , Further study chimeras 

 obtained from use of colchicine administered several years 

 earlier. Continue irradiating ccmmercial clones and new seed- 

 lings at suitable dosage rates to learn how readily mutants 

 can be obtained, 

 PI. Sci, 169 



Conn, G enetic and Cytological Study of Hereditary Characters 



in Plants With Special Attention to Genes Controlling Pollen 

 Production in Combination Witfr Sterile Cytoplasm , Further 

 infoiroation is needed concerning number, location in the 

 chromosomes, and the time and mode of action of these pollen- 

 restoring genes. 

 Genet, 501 



Conn, Variation in Cytoplasmic Components of the Cell With 



Special Attention to Pollen Abortion in Maize. Tobacco, and 

 Petunia, Further information is needed concerning the possible 

 differences between sterile plants of different sources, the 

 stability of the pollen abortion under different environments 

 and in different genotjrpes. 

 Genet, 505 



