[Text] = Temperaterens betydelse for pollenbildningen hos lark : монография / G. Eriksson. - Stockholm : Skogshogskolan, 1968. - 131 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 63). - eng. - Библиогр.: с. 127-131. - 1.50 р., 0.25 р.
Аннотация: In the present paper the meiotic development of three larch species was srudied. Emphasis was paid to the analysis of the conditions of importance for beaking the dormancy of the deplotene stage as well as the factors resposible for the initiation of further development from diplotene. On the basis of detailed analysis of
meiosis in a few clones 1966-67 as well as in larger number of clones in 1967-68, the following characteristics of the meiotic development of the three species were observed. It was shown that irregularities did not appear until sensitive cells were exposed to low temperatures. All phases of active division during
meiosis were believed to be highly sensitive to low temperatures. A direct relationship between the maximum percentage of irregularities during
meiosis and pollen sterility was demonstrated. This means that cytological examinations during
meiosis could advantageously be performed in order to predict the pollen sterility. With the aid of such tests the crossing programmes in seed orchards should be planned
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