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You searched for: Publication Year 1978 Remove constraint Publication Year: 1978 Subject backcrossing Remove constraint Subject: backcrossing
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1. EMS-Induced Male-Sterile Mutants in Euplasmic and Alloplasmic Common Wheat

Author:
Sasakuma, T; Maan, S. S.; Williams, N. D.
Source:
Crop science 1978 v.18 no.5 pp. 850-853
ISSN:
0011-183X
Subject:
Triticum aestivum; Triticum monococcum; Triticum timopheevii; backcrossing; cultivars; cytoplasm; dominant genes; genetic background; heterozygosity; inheritance (genetics); male fertility; male sterility; males; mutants; pollen; recessive genes; wheat
Abstract:
... We studied 12 EMS-induced male-sterile mutants that were isolated from alloplasmic Triticum aestivum L. having T. tauschii (Coss.) Schmal. cytoplasm. Of these 12, four mutants had all empty pollen grains; the remaining eight mutants had small proportions of fertile pollen grains. Eleven of the male-sterile lines were crossed to euplasmic ‘Chris’, and the F₁ heterozygous male-fertile plants were se ...
DOI:
10.2135/cropsci1978.0011183X001800050043x

2. Mating behaviour of glossina pallidipes austen (diptera, glossinidae): genetic differences in copulation time between allopatric population

Author:
JAENSON, THOMAS G.T.
Source:
Entomologia experimentalis et applicata 1978 pp. 100-108
ISSN:
0013-8703
Subject:
Glossina pallidipes; X chromosome; allopatry; autosomes; backcrossing; copulation; forests; genetic variation; hybrids; males; parents; Kenya
Abstract:
... Copulation duration of Glossina pallidipes from Lambwe Valley (0° 35′ S, 34° 15′ E) and Kibwezi Forest (2° 27′ S, 37° 55′ E) in Kenya, was investigated in the laboratory. The difference in mean copulation time between the populations was highly significant. Reciprocal copulations showed that the trait is predominantly or only determined by the male. F₁ and F₂ male hybrid durations were similar and ...
DOI:
10.1111/j.1570-7458.1978.tb02760.x

3. Sex pheromone specificity in Heliothis

Author:
Tingle, F.C.; Mitchell, E.R.; Baumhover, A.H.
Source:
Journal of chemical ecology 1978 v.4 no.4 pp. 471
ISSN:
0098-0331
Subject:
Heliothis subflexa; Heliothis virescens; Helicoverpa zea; sex pheromones; sex attractants; trapping; pheromone traps; backcrossing; hybrids; mating behavior; olfactometry; wind tunnels; nocturnal activity
Abstract:
... Electric grid traps baited with Heliothis subflexa (Guenée), H. virescens (F.), or H. zea (Boddie) females captured conspecific males with few exceptions.Heliothis subflexa females reduced the attraction ofH. virescens and H. zea males when used as bait simultaneously with females of either of these two species. Backcrosses were made with H. virescens males and female hybrids from a cross between ...
Handle:
10113/23301
DOI:
10.1007/BF00989503

4. Analysis of a hybrid swarm between Acacia brachybotrya and A. calamifolia (Leguminosae)

Author:
LEACH, G.J.; WHIFFIN, T.
Source:
Botanical journal of the Linnean Society 1978 v.76 no.1 pp. 53-69
ISSN:
0024-4074
Subject:
Acacia; backcrossing; flavonoids; hybridization; hybrids; parents; plant ecology; pollen
Abstract:
... A hybrid swarm between Acacia brachybotrya and A. calamifolia, involving plants referable to A. grayana, was studied in detail. Plants representing the range of variation found within the hybrid swarm were examined morphologically, chemically and ecologically in an attempt to document hybridisation and to determine their status. Plants referable to A. grayana are confirmed as hybrids, and other in ...
DOI:
10.1111/j.1095-8339.1978.tb01498.x

5. Developmental Allometry and Its Implication to Grain Yield in Barley

Author:
Hamid, Zakri A.; Grafius, J. E.
Source:
Crop science 1978 v.18 no.1 pp. 83-86
ISSN:
0011-183X
Subject:
Hordeum; allometry; backcrossing; barley; culms; cultivars; gene pool; genotype; grain yield; leaf area; leaves; photosynthesis; plant organs; seeds; tillers; yield components
Abstract:
... Five parental pairs of barley selections (Hordeum vulgate L. Emend. Lam) exhibiting differences in leaf area (S) and culm diameter (D) were used in this experiment. The crosses and backcrosses to each parent were allowed to self to the equivalent of the F₄ at which time 20 random plant selections were drawn from each of the 15 populations. Seed was increased for two generations and standard nurser ...
DOI:
10.2135/cropsci1978.0011183X001800010022x