Species Crosses in the Genus Cucurbita
نویسندگان
چکیده
منابع مشابه
Recombination in the genus Cucurbita.
ARIOUS structural and physiological barriers to recombination in species Vhyb rids often impose rigorous limitations upon the extent to which the characters of one species may be combined with those of another. Among such barriers structural and genic imbalance resulting in the differential elimination of gametes and zygotes of recombination types has often been mentioned (ANDERSON 1939; DEMPST...
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N THE field of mathematics there are numerous problems difficult to I solve with finite numbers which become relatively simple when the concept of infinity is introduced, Similarly, though the genetics of species crosses is obscure when considered in terms of single factors, i t seemed possible that i t might be illuminated if one attempted to consider the total recombination of specific differ...
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During the study on newly collected and herbarium specimens belonging to the genus Euphorbia, three species, namely, E. gorenfloti, E. cheirolepioides and E. splendida were found to be synonymous with E. chamaepeplus, E. grossheimii and E. decipiens, respectively. Euphorbia sahendi as an interesting and rare species has been recognized after long time again among my material and Euphorbia delto...
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The degree of reproductive isolation between Meccus phyllosomus and the remaining five species of the genus Meccus, as well as between Meccus bassolsae and Meccus pallidipennis, Meccus longipennis and Meccus picturatus, was examined. Fertility and the segregation of morphological characteristics were examined in two generations of hybrids from crosses between these species. The percentage of co...
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The DNAs of Cucurbita species were examined by several methods. All Cucurbita DNAs have a similar CsCl isopycnic banding pattern consisting of a major band at 1.695 g/cc and a well separated satellite band at 1.707 g/cc. Compared to other plant and animal genera, Cucurbita species have a large genomic proportion of rDNA; this value ranging from 1.4% to 3.1%. The genomic proportion of rDNA was f...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 1930
ISSN: 0002-9122
DOI: 10.2307/2446379