Lauri Mikkola 
Kuusilajien risteytyvyydestä
Mikkola L. (1970). Kuusilajien risteytyvyydestä. Silva Fennica vol. 4 no. 4 article id 4831. https://doi.org/10.14214/sf.a14620
English title: On the crossability of Picea speciesAbstract
Seed development was microscopically studied after controlled pollinations. In all the interspecific crosses incompatibility occured. In the following crosses the growth of all the pollen tubes stopped before they had penetrated through the nuclear cap: Picea abies (L.) Karst. x mariana, abies x jezoensis (and the reciprocal), abies x omorika (and the reciprocal), mariana x asperata, mariana x jezoensis and Picea abies x Pinus sylvestris L.
Some of the eggs were fertilized in the crosses Picea abies x glauca (and the reciprocal) abies x asperata, abies x koyamai, abies x obovata, mariana x omorika and jezoensis x omorika. Embryo degeneration was observed in all these crosses. All the embryos died in the crosses abies x glauca (and the reciprocal) as well as jezoensis x omorika. Adequate amounts of full seed for germination test was obtained from the crosses abies x asperata, abies x koyamai and abies x obovata. In all these crosses there were seeds which were able to germinate and the hybrids are now one growth season old.
The PDF includes a summary in English.
Original keywords
mänty;
metsänjalostus;
itävyys;
kuuset;
risteytys;
risteytyskokeet;
keinollinen pölytys
English keywords
Pinus sylvestris;
Picea abies;
tree breeding;
Picea;
Abies;
controlled pollination;
interspecific sterility;
hybrids;
crossbreeding
Published in 1970
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