ISSN:
1432-2242
Keywords:
Nicotiana knightiana
;
N. umbratica
;
Interspecific hybrids
;
Cytology
;
Female sterility
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary Interspecific hybrids and amphidiploids of Nicotiana knightiana Goodspeed (n= 12)x N. umbratica Burbidge (n = 23) resembled either parent in some characters and were intermediate in other characters. The F1 hybrids (2n = 35) showed mostly univalents during meiosis, while the amphidiploids (2n = 70) formed bivalents almost regularly. The former were completely sterile and the latter fully male fertile but predominantly female sterile. This female sterility was due to disintegration of the embryo sacs leading to collapsed ovules. The few fertile ovules, however, showed normal development of embryo sac and embryo. The occurrence of fertile and sterile ovules was believed to be due to segregation of the genes governing sterility.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00304921
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