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.

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.

Herbicide resistance in China: a quantitative review

Weed Science ◽  
2019 ◽  
Vol 67 (6) ◽  
pp. 605-612 ◽  
Author(s):  
Xiangying Liu ◽  
Shihai Xiang ◽  
Tao Zong ◽  
Guolan Ma ◽  
Lamei Wu ◽  
...  
Keyword(s):  
Herbicide Resistance ◽  
Crop Production ◽  
Rapid Evolution ◽  
Acetolactate Synthase ◽  
Cross Resistance ◽  
Weed Species ◽  
Herbicide Resistant ◽  
Auxin Herbicides ◽  
Economic Boom ◽  
Meta Analyses

AbstractThe widespread, rapid evolution of herbicide-resistant weeds is a serious and escalating agronomic problem worldwide. During China’s economic boom, the country became one of the most important herbicide producers and consumers in the world, and herbicide resistance has dramatically increased in the past decade and has become a serious threat to agriculture. Here, following an evidence-based PRISMA (preferred reporting items for systematic reviews and meta-analyses) approach, we carried out a systematic review to quantitatively assess herbicide resistance in China. Multiple weed species, including 26, 18, 11, 9, 5, 5, 4, and 3 species in rice (Oryza sativa L.), wheat (Triticum aestivum L.), soybean [Glycine max (L.) Merr.], corn (Zea mays L.), canola (Brassica napus L.), cotton (Gossypium hirsutum L.)., orchards, and peanut (Arachis hypogaea L.) fields, respectively, have developed herbicide resistance. Acetolactate synthase inhibitors, acetyl-CoA carboxylase inhibitors, and synthetic auxin herbicides are the most resistance-prone herbicides and are the most frequently used mechanisms of action, followed by 5-enolpyruvylshikimate-3-phosphate synthase inhibitors and protoporphyrinogen oxidase inhibitors. The lack of alternative herbicides to manage weeds that exhibit cross-resistance or multiple resistance (or both) is an emerging issue and poses one of the greatest threats challenging the crop production and food safety both in China and globally.

CYTOGENETIC EFFECTS OF 2,4-D AND AMITROLE IN RELATION TO NUCLEAR VOLUME AND DNA CONTENT IN SOME HIGHER PLANTS

1972 ◽  
Vol 14 (4) ◽  
pp. 773-783 ◽  
Author(s):  
T. Mohandas ◽  
W. F. Grant
Keyword(s):  
Hordeum Vulgare ◽  
Nuclear Dna ◽  
Higher Plants ◽  
Positive Control ◽  
Root Tip ◽  
Interphase Chromosome ◽  
Dna Values ◽  
Cytological Abnormalities ◽  
Centaurea Jacea ◽  
Chrysanthemum Leucanthemum

The cytological effects of 2,4-D and amitrole were studied for 12 species (Tradescantia clone 02, Allium cepa, Vicia faba, Triticum aestivum, T. dicoccum, Hordeum vulgare, Secale cereale, Centaurea jacea, Cirsium vulgare, Chrysanthemum leucanthemum, Plantago major and Erigeron canadensis). Ethyl methane sulfonate (EMS) was used as a positive control. The cytological abnormalities induced in root-tip cells by both 2,4-D and amitrole included chromosome bridges, fragments, lagging chromosomes, and chromatin bodies; 2,4-D also induced chromosome contraction, and C-mitoses. Studies following seed treatments of Hordeum vulgare on M2 seedlings showed that 2,4-D and EMS induced albina mutants. Interphase nuclear volumes of the various species were measured from root-tip meristems. Nuclear DNA values were determined cytophotometrically for seven species. The relative DNA values were found to be positively correlated with nuclear volumes. The lack of any clear relationship between the number of cytological abnormalities induced by the chemicals and the nuclear and interphase chromosome volumes of the plants probably reflects a lack of synchrony of the treated cell population.

scholarly journals The Influence of Nozzle Type on Peanut Weed Control Programs

2017 ◽  
Vol 44 (2) ◽  
pp. 93-99 ◽  
Author(s):  
O.W. Carter ◽  
E.P. Prostko ◽  
J.W. Davis
Keyword(s):  
Weed Control ◽  
Palmer Amaranth ◽  
Annual Grass ◽  
Weed Species ◽  
Target Movement ◽  
Herbicide Resistant ◽  
Control Programs ◽  
The Past ◽  
Auxin Herbicides ◽  
Nozzle Type

ABSTRACT The increase in herbicide-resistant weeds over the past decade has led to the introduction of crops that are resistant to auxin herbicides. Strict application procedures are required for the use of auxin herbicides in auxin-resistant crops to minimize off-target movement. One requirement for application is the use of nozzles that will minimize drift by producing coarse droplets. Generally, an increase in droplet size can lead to a reduction in coverage and efficacy depending upon the herbicide and weed species. In studies conducted in 2015 and 2016, two of the potential required auxin nozzle types [(AIXR11002 (coarse) and TTI11002 (ultra-coarse)] were compared to a conventional flat-fan drift guard nozzles [DG11002 (medium)] for weed control in peanut herbicide systems. Nozzle type did not influence annual grass or Palmer amaranth control in non-crop tests. Results from in-crop tests indicated that annual grass control was 5% to 6% lower when herbicides were applied with the TTI nozzle when compared to the AIXR or DG nozzles. However, Palmer amaranth control and peanut yield was not influenced by coarse-droplet nozzles. Peanut growers using the coarse-droplet nozzles need to be aware of potential reduced grass control.

scholarly journals Plant communities of cereals with respect to the location of field in mountain region

2013 ◽  
Vol 48 (1) ◽  
pp. 15-24
Author(s):  
Ewa Stupnicka-Rodzynkiewicz
Keyword(s):  
Plant Communities ◽  
Pronounced Effect ◽  
Mountain Region ◽  
Cirsium Arvense ◽  
Stellaria Media ◽  
Galium Aparine ◽  
Centaurea Cyanus ◽  
Weed Infestation

Studies on weed infestation of cereals with respect to the location of the field under various mountain conditions (bottom ofthe valley, slopes with different exposure, local top area) were carried out in the central part of the Dunajec valley in the Beskidy Mountains. Plant communities on the slopes and top area contained more species than those in the bottom of the valley. Coverage of soil by weeds on the slopes was also higher. However, slope exposure had no pronounced effect on the differentiation of weed composition. Dominating species in all area where the studies were carried out were: <em>Stellaria media, Galium aparine, Centaurea cyanus, Apera spica-venti and Cirsium arvense</em>.

scholarly journals PHYTODIVERSITY AND ECOLOGICAL FEATURES OF WEED SPECIES OF SUFAID SUNG, PESHAWAR

2021 ◽  
Vol 27 (2) ◽  
pp. 227-237
Author(s):  
Haroon Khan
Keyword(s):  
Weed Management ◽  
Life Form ◽  
Leaf Shape ◽  
Leaf Size ◽  
Single Species ◽  
Weed Species ◽  
Field Surveys ◽  
Ecological Features ◽  
Ecological Weed Management ◽  
Leaf Species

Field surveys were carried out to assess the phytodiversity, phenology, leaf size, leaf shape, life form and ethnobotany of weed flora of village Sufaid Sung, Peshawar from March 2017 to June 2019. Overall, 95 species have been reported associated with 31 families. Dominant families were Poaceae (22 species), Asteraceae (10 species) followed by Amaranthaceae and Papilionaceae (6 species each), Brassicaceae and Polygonaceae (5 species each), Euphorbiaceae and Solanaceae (4 species), Apiaceae, Caryophyllaceae, Cyperaceae, Malvaceae and Verbenaceae added 2 species, Chenopodiaceae and Convolvulaceae contributed 3 species, Apiaceae, Caryophyllaceae, Cyperaceae, Malvaceae and Verbenaceae added 2 species while the rest of 16 families contributed a single species each. The dominant life form was therophytes (76 species) followed by hemicryptophytes (11 species) and geophytes (8 species). Leaf size of the flora showed that the most dominant leaf size class was mesophyll (38 species) followed by macrophyll and microphyll (18 species each), nanopohyll (15 species) and leptophyll (5 species) while a single aphyllous. Simple leaf species were 68 while 26 species had dissected leaves. This study shows a detailed phytodiversical situation of weeds that may be important as reference work for future ethnobotanical, ecological, weed management and conservational studies.

scholarly journals The phytocoenoses of anthropogenically transformed areas with a great importance for Apoidea

2012 ◽  
Vol 60 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Małgorzata Wrzesień ◽  
Bożena Denisow
Keyword(s):  
Forest Edge ◽  
Cirsium Arvense ◽  
Oak Forests ◽  
Oenothera Biennis ◽  
Rumex Acetosa ◽  
Rosa Rugosa ◽  
Decisive Importance ◽  
Stellarietea Mediae ◽  
Adaptation Processes ◽  
Euphorbia Cyparissias

The paper indicates the phytocenoses most rich in bee taxons and occurring in habitats located along railway lines crossing Lublin Upland. To date, in the study area 124 basic phytocoenoses have been discovered, described and classifi ed into 12 different synecological groups. Among 52 phytocoenoses, the participation of bee flora was considerable. Most voluble phytocoenoses represent ruderal and segetal associations (<i>Artemisietea vulgaris</i>, <i>Stellarietea mediae</i> classes - 87 species), meadow and pasture associations (<i>Mollinio-Arrhenatheretea</i> - 56 species), psammophilous and xerothermic grasslands (<i>Festuco</i>- <i>Brometea</i>, <i>Koelerio glauce</i>-<i>Corynophoretea canescensis</i> - 38 species), thermophilous forest edge communities and thickets (<i>Trifolio</i>-<i>Geranietea</i> and <i>Rhamno</i>-<i>Prunetea</i> - 33 species). Significantly fewer melliferous and polleniferous taxons were noticed in mesophilous deciduous forests or thermophilous oak forests - 29 species. Most simple in structure and species richness are associations with <i>Rumex acetosa</i>, <i>Reseda lutea</i>, <i>Linaria vulgaris</i>, <i>Papaver rhoeas</i>, <i>Cirsium arvense</i>, <i>Oenothera biennis</i>, <i>Viola arvensis</i> and <i>Potentilletum anserine</i> or <i>Sisymbrietum altissimi</i>. The communities form patches (15-20 m<sup>2</sup>) with 80-100% cover of the diagnostic taxon and are of low or medium stability. The most persistent and floristically stable are <i>Tanaceto Artemisietum</i>, <i>Rudbeckio</i>- <i>Solidaginetum</i>, <i>Echio</i>-<i>Melilotetum</i>, <i>Sambucetum nigrae</i>, <i>Rubo fruticosi</i>-<i>Prunetum spinosae</i> and communities with <i>Rosa rugosa</i>, <i>Rubus caesius</i>, <i>Geranium robertianum</i>, <i>Pastinaca sativa</i>, <i>Trifolium medium</i> or <i>Euphorbia cyparissias</i>. The maintenance of the mosaic of phytocoenoses in anthropogenically transformed habitats, including those along railway lines, is of decisive importance for the protection of floristic diversity and adaptation processes of Apoidea.

scholarly journals Vegetation recovery in open cast mines of Tver Region

2021 ◽  
Vol 265 ◽  
pp. 01023
Author(s):  
Elena Parakhina ◽  
Ksenia Naumova
Keyword(s):  
Plant Communities ◽  
Vascular Plants ◽  
Life Form ◽  
Vegetation Recovery ◽  
Cirsium Arvense ◽  
Natural Plant ◽  
Melilotus Albus ◽  
Calamagrostis Epigejos ◽  
Tver Region ◽  
Open Cast

In the study natural plant communities appearing at the first stages of vegetation recovery in open cuts are described. Sixty-three species of higher vascular plants were found, six of which are adventive (Bunias orientalis L., Cichorium intybus L., Cirsium arvense (L.) Scop., Melilotus albus Medik., Sedum spurium M.Bieb., Solidago canadensis L.). Species from the Asteraceae (15), Gramíneae (8), Fabáceae (7) families prevail. The predominant life form according to I. Serebryakov are long-rhizome. According to G. Zozulin’s classification, plants belonging to the meadow and birch formations are most common. The associations of Calamagrostis epigejos and Bromus inermis predominate. Cirsium arvense (L.) Scop., Heracleum sibiricum L., Campanula glomerata L. are single.

Weed seed contamination in white clover seedlots

1990 ◽  
pp. 99-102
Author(s):  
J.S. Rowarth ◽  
A.A. Johnson ◽  
P.T.P. Clifford ◽  
M.P. Rolston
Keyword(s):  
White Clover ◽  
Chenopodium Album ◽  
Cirsium Arvense ◽  
Weed Seed ◽  
Weed Species ◽  
Stellaria Media ◽  
Seed Testing ◽  
Rumex Acetosella ◽  
Weed Seeds ◽  
Californian Thistle

Weed seeds are the major reason for white clover (Trifolium repens) seedlots being downgraded or rejected from certification. The occurrence of weed species in 537 white clover seedlots tested at the Official Seed Testing Station, Palmerston North, was analysed. The most commonly occurring species were field madder (Sherardia arvensis), chickweed (Stellaria media), fathen (Chenopodium album), sheep's sorrel (Rumex acetosella) and scarlet pimpernel (Anagaflis arvensis). The percentage occurrence of four specified undesirable weeds including Californian thistle (Cirsium arvense) and dodder (Cuscuta epithymum) are reported, and the implications of seed contamination are discussed. Keywords: white clover, contamination, weed seeds

scholarly journals Interphase nuclear phenotype and chromosomal variation in Cynodon dactylon (L.) pers

2019 ◽  
Vol 27 ◽  
pp. 133-141
Author(s):  
SK Nitu ◽  
SMS Islam ◽  
H Tarique
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Somatic Chromosome ◽  
Cynodon Dactylon ◽  
Nuclear Organization ◽  
Nuclear Volume ◽  
Chromosomal Variation ◽  
Nuclear Area ◽  
Somatic Chromosome Number ◽  
Interphase Chromosome

Interphase nuclear phenotype in different accessions (Acc.) of Cynodon dactylon studied in the present experiment showed chromocentric nuclear organization and the chromocenters were found to be visible clearly. The chromocenter numbers were not same and sometimes it was found to be significantly less and never more than total number of chromosomes. Percentages of heterochromatin values were expressed per nuclear area and the values range from 19.759% (Acc. 16) to 66.022% (Acc.18). Nuclear volume as well as interphase chromosome volume was found to vary 0.674 μm3 (Acc.6) to 41.921 μm3 (Acc.10) and from 0.028 μm3 (Acc. 6) to 1.905 μm3 (Acc. 10), respectively. The somatic chromosome number found to vary from 12 to 40. 2n = 18 chromosomes were found in eight accessions of C. dactylon. Only one accession was found to be tetraploid and rest of them aneuploid whose chromosome numbers were 12, 14, 16, 22, 24, 26, 32, 40 etc. The availability of aneuploid shows great aspects of forage breeding programme. J. bio-sci. 27: 133-141, 2019

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