Morphological and genetic factors influencing the response of weed species to herbicides

1978 ◽  
Vol 56 (12) ◽  
pp. 1466-1471 ◽  
Author(s):  
D. J. Tomkins ◽  
W. F. Grant
Keyword(s):  
Genetic Factors ◽  
Life Form ◽  
Basic Chromosome Number ◽  
Nuclear Volume ◽  
Weed Species ◽  
Interphase Chromosome ◽  
Basic Chromosome ◽  
Growing Seasons ◽  
Resistant Species ◽  
Factors Influencing

The survival of 75 weed species after exposure to herbicides (auxin and nonselective) was monitored over three growing seasons. Each species was classified as resistant, susceptible, or intermediate in response. Polyploids were consistently more resistant to both types of herbicides. In addition, average somatic (but not basic) chromosome number was significantly higher in species resistant to nonselective herbicides than in susceptible ones. The averages of both nuclear volume and interphase chromosome volume were greater in species resistant to auxins than in susceptible ones, although the results were not statistically significant at the 5% probability level. There was a significantly greater proportion of monocots than dicots among the auxin-resistant species, but there was no correlation between life-form and response to either group of herbicides.

A relationship between nuclear volume and response to auxin herbicides for some weed species

1973 ◽  
Vol 51 (6) ◽  
pp. 1133-1136 ◽  
Author(s):  
T. Mohandas ◽  
W. F. Grant
Keyword(s):  
Life Form ◽  
Nuclear Volume ◽  
Cirsium Arvense ◽  
Plantago Major ◽  
Weed Species ◽  
Interphase Chromosome ◽  
Centaurea Cyanus ◽  
Auxin Herbicides ◽  
Chrysanthemum Leucanthemum ◽  
Euphorbia Cyparissias

The responses of 15 weeds (Agropyron repens, Centaurea cyanus, C. jacea, Chrysanthemum leucanthemum, Cirsium arvense, C. vulgare, Daucus carota, Erigeron canadensis, Euphorbia cyparissias, E. esula, Nasturtium officinale, Neslia paniculata, Plantago major, Silene cucubalus, Vicia angustifolia) to eight herbicides were considered in relation to the level of ploidy, the life form, the nuclear volume, and the interphase chromosome volume, for each species. In general, susceptible weeds had a lower nuclear volume than those showing an intermediate or a resistant response to the herbicides. Interphase chromosome volume did not show any consistent relationship with the degree of susceptibility. Intermediate and resistant plants were mostly perennials, whereas susceptible ones were annuals or biennials.

Lipoprotein (a) Evolution: Possible Benefits and Harm. Genetic and Non-Genetic Factors Influencing its Plasma Levels

2017 ◽  
Vol 24 (10) ◽  
pp. 969-978 ◽  
Author(s):  
Peggy M. Kostakou ◽  
George Hatzigeorgiou ◽  
Vana Kolovou ◽  
Sophie Mavrogeni ◽  
Genovefa D. Kolovou
Keyword(s):  
Plasma Levels ◽  
Genetic Factors ◽  
Lipoprotein A ◽  
Factors Influencing

scholarly journals In vitro propagation and cytological analysis of Sophora mollis Royle: an endangered medicinal shrub

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Aakriti Bhandari ◽  
Harminder Singh ◽  
Amber Srivastava ◽  
Puneet Kumar ◽  
G. S. Panwar ◽  
...  
Keyword(s):  
Chromosome Number ◽  
Average Length ◽  
Germplasm Conservation ◽  
Basic Chromosome Number ◽  
Shoot Tip ◽  
Ex Situ ◽  
Ms Medium ◽  
Basic Chromosome ◽  
Shoot Tip Explants

Abstract Background Sophora mollis Royle (family Fabaceae, subfamily-Papilionaceae) is a multipurpose legume distributed in plains and foothills of the North-West Himalaya to Nepal and is facing high risk of extinction due to habitat loss and exploitation by the local people for its fuel and fodder values. Therefore, the present study was conducted to standardize a micropropagation protocol for Sophora mollis by using shoot tip explants and to study the meiotic chromosome count in the species. Results Multiple shoots were induced in shoot tip explants of Sophora mollis in Murashige and Skoog medium supplemented with different concentrations of cytokinins alone (BAP, TDZ, and Kinetin) and in combination with varying concentrations of NAA. MS medium supplemented with BAP (8.9 μM) was observed to be the optimal medium for multiple shoot induction and maximum 25.32 shoots per explant was obtained with average length of 4.5 ± 0.8 cm. In vitro developed shoots were transferred onto rooting media supplemented with different concentrations of auxin (IAA, IBA, and NAA). Maximum 86% rooting was observed in half-strength MS medium supplemented with 21.20 μM NAA with an average of 21.26 roots per culture. In vitro raised plantlets were adapted to greenhouse for better acclimatization and 60% plants were successfully transferred to the open environment. Based on the chromosome counts available from the literature and the current study, the species tend to show a basic chromosome number of x = 9. Conclusion The micropropagation protocol standardized can be helpful for the ex situ mass multiplication and germplasm conservation of the endangered species. Moreover, the ex situ conservation approach will be helpful in actively bridging the gap between ex situ and in situ approaches through the reintroduction of species in the wild. The cytological studies revealed the basic chromosome number x = 9 of the species.

GENETIC FACTORS INFLUENCING THE COMMON NEUROBIOLOGICAL SUBSTRATE FOR MENTAL DISORDERS

2019 ◽  
Vol 29 ◽  
pp. S798
Author(s):  
Till Andlauer ◽  
Thomas Mühleisen ◽  
Felix Hoffstaedter ◽  
Alexander Teumer ◽  
Anja Teuber ◽  
...  
Keyword(s):  
Mental Disorders ◽  
Genetic Factors ◽  
Factors Influencing ◽  
The Common

Mapping of genetic factors influencing the weight of cystic fibrosis knockout mice

2002 ◽  
Vol 13 (11) ◽  
pp. 614-618 ◽  
Author(s):  
Christina K. Haston ◽  
Mary Corey ◽  
Lap-Chee Tsui
Keyword(s):  
Cystic Fibrosis ◽  
Knockout Mice ◽  
Genetic Factors ◽  
Factors Influencing

scholarly journals Genetic factors influencing bone mineral content in a black South African population

2013 ◽  
Vol 31 (6) ◽  
pp. 708-716 ◽  
Author(s):  
Andrew May ◽  
John M. Pettifor ◽  
Shane A. Norris ◽  
Michèle Ramsay ◽  
Zané Lombard
Keyword(s):  
Bone Mineral Content ◽  
South African ◽  
Bone Mineral ◽  
Mineral Content ◽  
Genetic Factors ◽  
African Population ◽  
South African Population ◽  
Black South African ◽  
Factors Influencing

Genetic Factors Influencing High Oleic Acid Content in Spanish Market‐Type Peanut Cultivars

Crop Science ◽  
2001 ◽  
Vol 41 (1) ◽  
pp. 51-56 ◽  
Author(s):  
Yolanda López ◽  
Olin D. Smith ◽  
Scott A. Senseman ◽  
William L. Rooney
Keyword(s):  
Oleic Acid ◽  
Acid Content ◽  
Genetic Factors ◽  
Oleic Acid Content ◽  
High Oleic Acid ◽  
High Oleic ◽  
Factors Influencing ◽  
High Oleic Acid Content ◽  
Peanut Cultivars

scholarly journals Relations and evolution in Cheilanthes (Sinopteridaceae, Pteridophita) in Macaronesia and Mediterranean area, deduced from genome analysis of their hybrids

1983 ◽  
Vol 8 ◽  
pp. 101-126 ◽  
Author(s):  
G. Vida ◽  
A. Major ◽  
T. Reichstein
Keyword(s):  
Chromosome Number ◽  
Genome Analysis ◽  
Chromosome Doubling ◽  
Diploid Species ◽  
Mediterranean Area ◽  
Basic Chromosome Number ◽  
The Other ◽  
Experimental Conditions ◽  
Natural Group ◽  
Basic Chromosome

Nine species of "Cheilantoid ferns" are known to grow in Macaronesia and the Mediterranean basin. Two of them (lacking a pseudo-indusium and having the basic chromosome number X = 29), both aggregate species which we prefer to retain in Notholaena, are not included in this study. The other seven species (with distinct pseudo-indusium and the basic chromosome number X = 30), which we accept as members of the genus Cheilanthes Sw. sensu stricto, were subjected to detailed genome analysis of their natural and experimentally produced hybrids and shown to represent an aggregate of four very distinct ancestral diploids and three allotetraploids. The latter must have once been formed by chromosome doubling in the three diploid hybrids of C. maderensis Lowe with the other three diploid species. Theoretically three more allotetraploids would be possible but their formation has obviously been prevented by the geographical separation of the three respective diploids. The most widely distributed of the tetraploids, i.e. C. pteridioides (Reich.) C.Chr. has also been resynthesized from its ancestors (still sympatric) under experimental conditions. The intermediate morphology of the allotetraploids (as compared with their diploid ancestors) is obviously the reason why their status and existence has so long escaped recognition in Europe. These seven species form a natural group and, in our opinion, should not be divided into sections.

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