Variation in pollen and ovule fertility in varieties of cassava, and the effect of interspecific crossing on fertility

Euphytica ◽  
1963 ◽  
Vol 12 (1) ◽  
pp. 69-76 ◽  
Author(s):  
D. L. Jennings
Keyword(s):  
Interspecific Crossing

scholarly journals Acylsugars in tomato leaflets confer resistance to the South American tomato pinworm, Tuta absoluta Meyr

2006 ◽  
Vol 63 (1) ◽  
pp. 20-25 ◽  
Author(s):  
Juliano Tadeu Vilela de Resende ◽  
Wilson Roberto Maluf ◽  
Marcos Ventura Faria ◽  
Alessandra Zawadzki Pfann ◽  
Ildon Rodrigues do Nascimento
Keyword(s):  
Tuta Absoluta ◽  
Wild Accession ◽  
South American ◽  
Resistance Level ◽  
Plant Damage ◽  
F2 Population ◽  
South American Tomato Pinworm ◽  
Lesion Type ◽  
Parental Lines ◽  
Interspecific Crossing

Acylsugars present in the accession 'LA716' of Lycopersicon pennellii play an important role in the resistance to Tuta absoluta. This paper investigates the possible association between the resistance to T. absoluta and the acylsugar contents in F2 and F2BC1 tomato plants derived from the interspecific crossing between L. esculentum 'TOM-584' and L. pennellii 'LA716'. From the F2 population, four high acylsugars and one low acylsugars plants were selected and tested for Tuta absoluta resistance along with parental lines TOM-584 and LA-716, and with the checks TOM-600 (high 2-tridecanone line with resistance to T. absoluta) and TOM-556 (low acylsugar line). The genotypes were tested under natural field infestation and were evaluated for overall plant damage, leaflet lesion type and percent of attacked leaflet. Four plants from F2BC1 [=(Lycopersicon esculentum 'TOM-584' <FONT FACE=Symbol>´</FONT> F2)] were selected for high acylsugars and two for low acylsugars, and tested in greenhouse cages infested with T. absoluta. These genotypes were evaluated with the parental lines and the checks for oviposition ten days after infestation, and for leaflet lesion type and overall plant damage at four different dates. The F2 genotypes BPX-370Bpl#25, BPX-370Bpl#30 and BPX-370Bpl#79, the F2BC1 genotypes BPX-370B pl#30-380 and BPX-370B pl#30-271 and the wild accession LA716 had good levels of resistance to Tuta absoluta. The resistance level increased with longer exposition time to the acylsugars, both in the field and in the cage tests. Acylsugar contents seemed to be highly and negatively correlated with the traits related to the pinworm resistance.

scholarly journals Interspecific Crossing Barriers in Sesame (Sesamum indicum L.)

2017 ◽  
Vol 6 (10) ◽  
pp. 4894-4900 ◽  
Author(s):  
Vikas V. Kulkarni ◽  
C.N. Ranganatha ◽  
I. Shankergoud
Keyword(s):  
Sesamum Indicum ◽  
Crossing Barriers ◽  
Interspecific Crossing

THE CHROMOSOMAL BASIS OF VIABILITY IN INTERSPECIFIC HYBRIDS BETWEEN DROSOPHILA ARIZONENSIS AND DROSOPHILA MOJAVENSIS

1981 ◽  
Vol 23 (1) ◽  
pp. 65-72 ◽  
Author(s):  
E. Zouros
Keyword(s):  
Hybrid Sterility ◽  
Introgressive Hybridization ◽  
Backcross Progeny ◽  
Interspecific Crosses ◽  
Drosophila Mojavensis ◽  
Pure Species ◽  
Ecological Barriers ◽  
Chromosomal Identification ◽  
Interspecific Crossing

The chromosomal effects on differences in viability among progeny from interspecific crosses was studied in the interfertile pair Drosophila arizonensis and Drosophila mojavensis. Interspecific crossing-over was avoided by crossing hybrid males to pure-species females, and chromosomal identification in backcross progeny was possible by means of electrophoretic markers. The main findings are as follows. One chromosome supresses viability when in the heterospecific state, this being mainly so when the rest of the genotype is predominantly of mojavensis type; the other chromosomes show occasional interspecific heterosis, but are neutral in the majority of cases; interactions are not significant, except in one pair of chromosomes within a mojavensis background; there is no correlation between numbers of heterospecific chromosomes and viability scores. It is concluded that hybrid and backcross progeny inviability is not a very potent mechanism for keeping these species apart. Should etiological and ecological barriers break down, introgressive hybridization is a real possibility. The findings are compared with those from studies concerning hybrid sterility and mating behavior in these two species. It is concluded that there is no common chromosomal basis for these phenomena. In particular, the role of interspecific inversions to speciation remains obscure.

scholarly journals Cytological Evaluations of Advanced Generations of Interspecific Hybrids Between Allium cepa and Allium fistulosum Showing Resistance to Stemphylium vesicarium

Genes ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 195 ◽  
Author(s):  
Natalia Kudryavtseva ◽  
Michael J. Havey ◽  
Lowell Black ◽  
Peter Hanson ◽  
Pavel Sokolov ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Interspecific Hybrids ◽  
Molecular Classification ◽  
Allium Fistulosum ◽  
Bulb Onion ◽  
Allium Cepa L ◽  
Disease Resistances ◽  
Interspecific Crossing

Interspecific crossing is a promising approach for introgression of valuable traits to develop cultivars with improved characteristics. Allium fistulosum L. possesses numerous pest resistances that are lacking in the bulb onion (Allium cepa L.), including resistance to Stemphylium leaf blight (SLB). Advanced generations were produced by selfing and backcrossing to bulb onions of interspecific hybrids between A. cepa and A. fistulosum that showed resistance to SLB. Molecular classification of the cytoplasm established that all generations possessed normal (N) male−fertile cytoplasm of bulb onions. Genomic in situ hybridization (GISH) was used to study the chromosomal composition of the advanced generations and showed that most plants were allotetraploids possessing the complete diploid sets of both parental species. Because artificial doubling of chromosomes of the interspecific hybrids was not used, spontaneous polyploidization likely resulted from restitution gametes or somatic doubling. Recombinant chromosomes between A. cepa and A. fistulosum were identified, revealing that introgression of disease resistances to bulb onion should be possible.

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