Alterações morfológicas de plântulas de trigo, azevém e nabo quando em competição nos estádios iniciais de crescimento

Lamego, Fabiane Pinto; Reinehr, Marcela; Cutti, Luan; Aguiar, Adalin Cézar Moraes de; Rigon, Carlos Alberto Gonsiorkiewicz; Pagliarini, I.B.

doi:10.1590/s0100-83582015000100002

Cited by 11 publications

(11 citation statements)

References 14 publications

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“…The presence of "neighboring" plants alters the growth of their shoot as a way to improve the efficiency in the capture of the light radiation and avoid the shading (Lamego et al, 2015). The light stress caused by the competition may lead to different plant responses, one of the main ones characterized by alterations in the root system and reduction of the area of exploitation, which directly affect water and nutrient absorption rates (Taiz and Zeiger, 2017).…”

Section: Introductionmentioning

confidence: 99%

Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

et al. 2019

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Weed competition limits wheat yield by reducing the availability of essential resources for its growth and development. In this sense, this study aimed to estimate the economic threshold level (ETL) of wild radish (Raphanus raphanistrum) in competition with wheat cultivars. Treatments were arranged in a factorial scheme. The factor wheat cultivar consisted of early (BRS 328), medium (BRS 177), and late (BRS Umbu) cycles and the factor wild radish population ranged from 0 to 564 plants m-2 (10 populations) for the cultivar BRS 328, 0 to 472 plants m-2 for the cultivar BRS 177 (11 populations), and 0 to 724 plants m-2 for the cultivar BRS Umbu (10 populations). The early-cycle BRS 328 presented a higher competitive ability when compared to the medium-cycle BRS 177 and late-cycle BRS Umbu. Yield losses of wheat grains due to wild radish interference can be satisfactorily estimated by the rectangular hyperbola model using the variables plant population, shoot dry matter, soil cover, and leaf area of the weed. ETL values varied as a function of the cultivar cycle, being higher for the cultivar BRS 328 (early) > BRS 177 (medium) > BRS Umbu (late). Wild radish is competitive in wheat crop, requiring at least 1.6 plants m-2 for control to be justified.

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Section: Introductionmentioning

confidence: 99%

Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

et al. 2019

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“…Furthermore, according to Lamego et al (2015), this barrier can damage seedlings, causing them to be etiolated by means of a quantity and quality luminous radiation search mechanism, making them more susceptible to mechanical damage during crop cycle and consuming reserves that could be used in plant development. High vigor seeds resulted in seedlings with a higher dry mass of shoot when compared to those from low vigor seeds, in both cultivars (Table 1).…”

Section: Introductionmentioning

confidence: 99%

Seed vigor and amount of soybean straw on seedling emergence and productive performance of wheat

Abati¹,

Brzezinski²,

Zucareli³

et al. 2017

SCA

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The use of high-quality seeds is essential to minimize the possible suppressive effect of straw on seedling emergence, contributing to stand establishment and high grain yield. The aim of this study was to assess the influence of seed vigor associated with soil cover with different amounts of soybean straw on seedling emergence and productive performance of wheat. The experiment was conducted in a greenhouse using two wheat cultivars (CD 150 and BRS Gralha Azul) under a completely randomized design in a 2 × 5 factorial scheme with four replications. Factors consisted of two seed vigor levels (high and low) and five amounts of soybean straw (0, 3, 6, 9, and 12 t ha −1). The following assessments were performed: seedling emergence, dry mass of seedling shoot, number of tillers, plant height, yield components (number of spikes per plant, number of grains per spike, and mass of one thousand seeds), grain yield, and harvest index. The use of high vigor seeds favors the emergence and dry mass production of seedling shoot for both cultivars. The increased amount of soybean straw reduces seedling emergence in both cultivars. In the cultivars CD 150 and BRS Gralha Azul, the amounts of soybean straw of 2.45 and 5.40 t ha −1 , respectively, result in a higher wheat grain yield. Key words: Seedling establishment. Seed quality. Triticum aestivum L. Vegetation cover. ResumoO uso de sementes de elevada qualidade é fundamental para minimizar o possível efeito supressor da palhada sobre a emergência de plântulas, contribuindo para o estabelecimento do estande e a obtenção de altos rendimentos de grãos. O objetivo foi avaliar a influência do vigor de sementes associado à cobertura do solo com diferentes quantidades de palhada de soja, sobre a emergência de plântulas e o desempenho produtivo da cultura do trigo. O experimento foi conduzido em casa de vegetação, utilizando duas cultivares de trigo (CD 150 e BRS Gralha Azul), sob o delineamento inteiramente casualizado, em esquema fatorial 2x5, com quatro repetições. Os fatores foram constituídos por dois níveis de vigor de sementes (alto e baixo) e cinco quantidades de palhada de soja (0, 3, 6, 9 e 12 t ha -1 ). As avaliações efetuadas foram: emergência de plântulas, massa seca da parte aérea de plântulas, número de perfilhos, altura de plantas, componentes do rendimento (número de espigas por planta, número de grãos por espiga e massa de mil sementes), produtividade de grãos e índice de colheita. A utilização de sementes de alto vigor favorece a emergência e a produção de massa seca da parte aérea das plântulas,

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“…The plants are able to perceive the presence of weeds in their early stages and redirect the flow of photoassimilates according to the quality of light radiation intercepted by the seedlings (Vidal & Merotto Jr., 2010), directing the biggest allocation of photoassimilates to the shoot part of the bean plant when in competition. This occurrence can be seen in wheat in the presence of ryegrass and turnip competitors, which also showed an increase in the relation height/root length ratio (Lamego et al, 2015).…”

Section: Resultsmentioning

confidence: 67%

Interference of volunteer corn in growth and chlorophyll fluorescence of bean

et al. 2019

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Corn kernels or seeds that remain a er harvest can germinate and become a troublesome volunteer plant where bean crops are grown. e objective of this study was to evaluate the e ect of time of emergence of volunteer corn on growth parameters, photosynthetic pigments and chlorophyll uorescence in bean plants, competition for soil and light and light resources. e study was conducted in completely randomised experimental design, in 2×2×2+2 factorial scheme with four replications, involving two bean cultivars in competition with volunteer corn, emerging seven days before and simultaneously with beans, besides the partitioning of the competition by soil and light, just light and two controls without competition. We measured the levels of chlorophyll a, b, total and carotenoids, parameters related to chlorophyll uorescence and bean growth variables. Volunteer corn was more competitive when it emerged seven days before the beans. When competition was established by light resource, there was a reduction in photosynthetic pigments and morphological variables of the bean plants. When competition by soil and light resources occurred, there was a reduction not only in photosynthetic pigments and morphological characteristics, but also in the chlorophyll uorescence variables. ere were signi cant correlations between the growth variables of the bean plants and chlorophyll uorescence, which makes it an important analytical tool for quantifying the stress caused by weeds.

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Alterações morfológicas de plântulas de trigo, azevém e nabo quando em competição nos estádios iniciais de crescimento

Cited by 11 publications

References 14 publications

Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

Criteria for Decision Making and Economic Threshold Level for Wild Radish in Wheat Crop

Seed vigor and amount of soybean straw on seedling emergence and productive performance of wheat

Interference of volunteer corn in growth and chlorophyll fluorescence of bean

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