Crescimento inicial de Merremia cissoides, Neonotonia wightii e Stizolobium aterrimum

Campos, Luiz Henrique Franco de; Mello, M. S.; Carvalho, Saul Jorge Pinto de; Nicolai, Marcelo; Christoffoleti, Pedro Jacob

doi:10.1590/s0100-83582012000300005

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…This result may be an evolutionary trait that was developed for this biotype to dominate the environment and perpetuate the species. Furthermore, weeds with rapid early growth require that management of this species should be undertaken in young plants, as later control is not the best option for sourgrass (Campos et al, 2012). Looking at the absolute growth rate (AGR), there is a rapid growth of the resistant biotype from 30 DAS, peaking at 47 DAS in association with the formation of tillers and leaves, followed by a decrease in growth (Fig 3d).…”

Section: Detection Of Resistance and Biotypes Developmentmentioning

confidence: 99%

Plant growth and genetic polymorphism in glyphosate-resistant sourgrass (Digitaria insularis L. Fedde)

Martins¹,

Barroso²,

Carvalho³

et al. 2016

Aust J Crop Sci

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Weed herbicide resistance has been a challenge in agriculture. The objective of this study was to detect sourgrass (Digitaria insularis (L.) Fedde) glyphosate-resistant plants and to evaluate the growth and polymorphism rate between the resistant and susceptible biotypes, as a subsidy for the integrated management of species. An experiment was conducted primarily for the detection of weed resistance using increasing doses of glyphosate to generate a dose-response curve. Then, an experiment consisting of eight treatments (destructives analysis of growth) and five replications was conducted to characterize and compare the phenological stages of each biotype. In addition to visual assessments, the dry weight and leaf area, absolute and relative growth rates, net assimilation rate and leaf area ratio of plants were determined. Finally, polymorphism among biotypes was determined using inter simple sequence repeat molecular markers. A resistant factor of 3.12 was found among the biotypes. The resistant biotype grew faster and was more robust than the susceptible biotype, arriving first to flowering. The resistant biotype was better adapted to light interception. The 25 inter simple sequence repeat molecular markers analysis showed a polymorphism rate of 56.6% among the analyzed biotypes.

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Section: Detection Of Resistance and Biotypes Developmentmentioning

confidence: 99%

Plant growth and genetic polymorphism in glyphosate-resistant sourgrass (Digitaria insularis L. Fedde)

Martins¹,

Barroso²,

Carvalho³

et al. 2016

Aust J Crop Sci

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Phenotypic plasticity of Neonotonia wightii and Pueraria phaseoloidesgrown under different light intensities

Santos

Cruz

Santos

et al. 2015

An. Acad. Bras. Ciênc.

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Plants have the ability to undergo morphophysiological changes based on availability of light. The present study evaluated biomass accumulation, leaf morphoanatomy and physiology of Neonotonia wightii and Pueraria phaseoloides grown in full sunlight, as well as in 30% and 50% shade. Two assays were performed, one for each species, using a randomized block design with 10 replicates. A higher accumulation of fresh mass in the shoot of the plants was observed for both species under cultivation in 50% shade, while no differences were detected between the full sunlight and 30% shade. N. wightii and P. phaseoloides showed increase in area and reduction in thickness leaf when cultivated in 50% shade. There were no changes in photosynthetic rate, stomatal conductance, water use efficiency and evapotranspiration of P. phaseoloides plants because growth environment. However, the shade treatments caused alterations in physiological parameters of N. wightii. In both species, structural changes in the mesophyll occurred depending on the availability of light; however, the amount of leaf blade tissue remained unaltered. Despite the influence of light intensity variation on the morphophysiological plasticity of N. wightii and P. phaseoloides, no effects on biomass accumulation were observed in response to light.

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Shoot and root interference of morning glory on the initial growth of sugarcane

Alves

Bianco

Nepomuceno

et al. 2018

An. Acad. Bras. Ciênc.

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Among weeds, morning glories comprise a very important group of climbing plants that infest sugarcane crops. The objective of this study was to evaluate the shoot and root interference of Merremia cissoides on the initial growth of sugarcane cultivar RB 966928. The experiment consisted of five treatment groups: (i) sugarcane monocropping, (ii) morning glory monocropping, (iii) sugarcane intertwined with morning glory but inseparate boxes, (iv) sugarcane intertwined with morning glory in attached boxes and (v) sugarcane with morning glory in attached boxes with morning glory prevented from intertwining with the sugarcane. The experimental design consisted of randomized blocks with four replicates. Merremia cissoides adversely affected the initial growth of the RB 966928 sugarcane starting at 90 days after transplanting (DAT). This effect increased with the time of intercropping, reaching at 180 DAT with a reduction of 57.3% in height,15.5% in stalk diameter, 90.4% in leaf areas, 86.6 and 75.2% in stalk and leaf dry mass, respectively. These reductions primarily due to the weed intertwining with the sugarcane plants because the weed had a physical choking and shading effect. This negative effect of morning glory on the sugarcane plants increased when they shared the substrate (i.e., when they competed for space and water), which also adversely affected weed growth, reducing 50.2% leaf areas and 42.1% shoot dry mass. The leaf area and the stalk and leaf dry mass of sugarcane are the characteristics more sensitive to the weed interference. Thus, both the shoot and root of M. cissoides interferes negatively in the growth of sugarcane, with the effect proportional to the period of coexistence, highlighting the detrimental effect on the stem (greater economic interest), and may also compromise the mechanical harvesting of the crop.

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Crescimento inicial de Merremia cissoides, Neonotonia wightii e Stizolobium aterrimum

Cited by 4 publications

References 11 publications

Plant growth and genetic polymorphism in glyphosate-resistant sourgrass (Digitaria insularis L. Fedde)

Plant growth and genetic polymorphism in glyphosate-resistant sourgrass (Digitaria insularis L. Fedde)

Phenotypic plasticity of Neonotonia wightii and Pueraria phaseoloidesgrown under different light intensities

Shoot and root interference of morning glory on the initial growth of sugarcane

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