منابع مشابه
Sterility in Wild Roses and in Some Species Hybrids.
Variation in pollen sterility in the same individual in one season.. . . . . . . . . . . . . . . . . . . . . . Variation in pollen sterility in the sa Ovule sterility.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GENERAL DISCUSSION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CONCLUSION. . ...
متن کاملPhylogeny and biogeography of wild roses with specific attention to polyploids.
BACKGROUND AND AIMS The genus Rosa (150-200 species) is widely distributed throughout temperate and sub-tropical habitats from the northern hemisphere to tropical Asia, with only one tropical African species. In order to better understand the evolution of roses, this study examines infrageneric relationships with respect to conventional taxonomy, considers the extent of allopolyploidization and...
متن کاملFree groups and roses
Consider the 2n symbols x1, . . . , xn, x−1 1 , . . . , x −1 n . Collect these into a set G. There is a map from G to itself which interchanges xi and x−1 i . This map is denoted by the usual inversion symbol g 7→ g−1. Thus x−1 i is unambiguous and (x −1 i ) −1 = xi. The empty word will be denoted by 1. A word is defined to be a finite ordered list of elements of G, depicted as exemplified by x...
متن کاملWild and farm breeding cervids infections with Anaplasma phagocytophilum.
The main goal of our study was to determine the prevalence of Anaplasma phagocytophilum infections in wild cervids living in north-eastern part of Poland. Material used in the study was gathered between the years 2004- 2008. The blood samples from 106 red deer (Cervus elaphus), 32 sika deer (Cervus nippon hortulorum), 130 fallow deer (Dama dama) and 31 roe deer (Capreolus capreolus) were collec...
متن کاملBreeding parrots -- learn about their life in the wild
Experience does enter the equation to a degree, but many beginners are successful while others keep parrots for years with very poor breeding results. This is not only because they have too many birds and not enough time to devote to each pair, but because they lack the ability to identify with the parrots in their care. Yes, it is all about caring and that derives from careful observation and ...
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ژورنال
عنوان ژورنال: Journal of Heredity
سال: 1908
ISSN: 0022-1503,1465-7333
DOI: 10.1093/jhered/os-4.1.240