Relationship between the morphogenesis of Italian ryegrass cv. 'BRS Ponteio' with forage and seed production

Cunha, Ricardo Pereira da; Pedroso, Carlos Eduardo da Silva; Mittelmann, Andréa; Oliveira, Roberto Caetano de; Bohn, Alberto; Silva, Jessica Dias Gomes da

doi:10.1590/0103-8478cr20150296

Cited by 6 publications

(5 citation statements)

References 5 publications

(4 reference statements)

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“…Generally, defoliation is employed during the vegetative stage in order to minimize impacts on seed yield and maintain straw production (CUNHA et al, 2016). However, if the reproductive tillers are exposed to decapitation, which is a condition frequently observed in southern Brazilian fields, significantly reduces pasture establishment in the following year (BARTHOLOMEW & WILLIANS, 2009).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fertilization of self-seeding Italian ryegrass: effects on plant structure, forage and seed yield

et al. 2020

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ABSTRACT: This study aimed to evaluate the effect of different levels of self-seeding Italian ryegrass (Lolium multiflorum Lam.) and nitrogen rates - applied additionally after two defoliations - on plant structure, in forage and seed yield. Levels of self-seeding were classified as very high (777 kg ha-1), high (736 kg ha-1), intermediate (624 kg ha-1), and low (234 kg ha-1). Populations were fertilized with zero, 20.25, 40.50, and 60.75 kg ha-1 of supplemental nitrogen applied after two defoliations; respectively, in very high, high, intermediate, and low levels. Higher levels of self-seeding promoted greater forage yield and uniformity of vegetation structure. Number of fertile tillers and number of seeds per plant have benefited by the combination of high self-seeding and supplemental nitrogen fertilization. Despite influencing the uniformity and amount of forage obtained in two defoliations, the very high and low self-seeding levels did not differ in Italian ryegrass seed production. However, linear addition for this same variable was obtained with the inclusion of supplemental nitrogen fertilization. In pastures from low and intermediate self-seeding levels, total dry mass increases linearly with the levels of nitrogen fertilization assessed in this research.

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Section: Introductionmentioning

confidence: 99%

Nitrogen fertilization of self-seeding Italian ryegrass: effects on plant structure, forage and seed yield

et al. 2020

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“…In this sense, considering the yield components and the quality of the seed produced, the execution of two defoliations becomes more attractive due to the more significant number of tillers plant -1 , forage harvest, and seed production (CUNHA et al, 2016), relating treatments with fewer defoliations. The imposition of three defoliations becomes attractive, especially when the main objectives are forage harvesting and natural reseeding.…”

Section: Defoliationmentioning

confidence: 99%

“…The annual ryegrass Lolium multiflorum is a forage highly adapted to southern Brazil's climate, providing high levels of forage and seed production (CUNHA et al, 2016;BOHN et al, 2020). Despite having high adaptation and various purposes of use, the exploitation of this forage species varies according to the management of defoliation adopted and nitrogen fertilization in coverage (BOHN et al, 2020;BOLKE et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies

et al. 2022

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This study determined the effect of different defoliation frequencies in a long-cycle ryegrass cultivar on yield components and the physiological and sanitary quality of seeds. Four defoliation frequencies were applied (without, one, two, and three defoliations). The time between defoliations was 350 degree-days. At the first, second, and third defoliation time, the plants were 15 cm, 20 cm, and 35 cm, respectively, and were lowered to half their height. The yield components and plant structure were evaluated through the tillers, along with the physiological quality of the seeds, which was verified by germination tests, first germination count, accelerated aging, tetrazolium test, field emergence, and weight of a thousand seeds. For the sanitary quality analysis, the percentage (%) of fungi incidence in the seeds was verified. The second defoliation determined the seeds’ high physiological and sanitary quality due to the higher amount of primary and secondary tillers produced concerning the other treatments. However, there was no significant difference for the third defoliation since the aerial tillers issued the same quality of seeds originated from primary and secondary tillers. The average incidence of fungi such as Colletotrichum sp., Fusarium sp., Phoma sp., and Dreshslera spp. was lower in ryegrass plants subjected to three defoliations.

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“…Opposite results were found in a study carried out under field conditions, in which the tetraploid cultivar INIA TITAN ® was submitted to cut levels and presented lower seed yield when compared to wild diploid ryegrass, regardless of the cutting frequency (Tonetto et al, 2011). However, cutting regime can promote drastic and negative changes in morphogenic traits and ryegrass seed yield (Cunha et al, 2016).…”

Section: Fitness Costmentioning

confidence: 99%

Fitness Cost and Competitive Ability to Different Ploidy Levels in Ryegrass Genotypes

et al. 2019

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The intergenotypic competition of tetraploid ryegrass with natural diploid population may be a tool to reduce the frequency of resistant individuals in an area. This study aimed to identify and compare the phenological development, fitness cost, and competitive ability between diploid and tetraploid ryegrass genotypes. Genotypes were grown in pots, and the morphological variables of genotype growth were assessed every 15 days up to 120 days after emergence to evaluate the fitness cost. Phenological development and seed yield components were measured in a single time together with the fitness cost. Competitive ability was determined in a replacement-series experiment with proportions of tetraploid and diploid ryegrass, in which the number of tillers, plant height, leaf area, and shoot dry weight were assessed at 50 days after emergence. The results of fitness cost showed that the number of tillers, leaf area, root dry weight, and the number of seeds were higher for tetraploid ryegrass, which presented a higher competitive ability than the diploid genotype regardless of the tested proportions. Tetraploid ryegrass may be useful for reducing the frequency of herbicide-resistant diploid ryegrass because of its higher competitive potential.

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Relationship between the morphogenesis of Italian ryegrass cv. 'BRS Ponteio' with forage and seed production

Abstract: This study aims to verify, accurate and precisely, the responses of Italian ryegrass 'BRS

Cited by 6 publications

References 5 publications

Nitrogen fertilization of self-seeding Italian ryegrass: effects on plant structure, forage and seed yield

Nitrogen fertilization of self-seeding Italian ryegrass: effects on plant structure, forage and seed yield

Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies

Fitness Cost and Competitive Ability to Different Ploidy Levels in Ryegrass Genotypes

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