Crescimento e partição de matéria seca e de carbono no mamoeiro em resposta à nutrição nitrogenada

Cruz, Jailson Lopes; Coelho, E. F.; Pelacani, Claudinéia Regina; Filho, M. A. Coelho; Dias, Antonivalda Tosta; Santos, Marta Taluana

doi:10.1590/s0006-87052004000300005

Cited by 12 publications

(14 citation statements)

References 25 publications

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“…Since water is the main interference factor in plant physiological processes (Gouveia Neto, 2011), and its restriction triggers plant phenological development acceleration, DM and nutrient partitioning between the different plant organs is changed. Although developing grains act as strong photoassimilate sinks in the plant (Dantas Júnior et al, 2010;Soratto et al, 2013;Santos et al, 2015), in the season cultivation, where there was greater water availability (Figure 1), DM allocation to stem and leaf growth was high, even after flowering (Figure 2e, f, g, h), confirming reports that stress affects photoassimilate partitioning in plants (Thornley, 1972;Cruz et al, 2004).…”

Section: Resultssupporting

confidence: 82%

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Castro¹,

Crusciol²,

Fernandes³

et al. 2017

Científica

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The aim of the present study was to evaluate dry matter partitioning and macro-and micronutrient accumulation and distribution in small-sized castor plants grown in season and off-season. The experiments were conducted during the 2005-2006 season and in the 2006 off-season in an Oxisol. A completely randomized block design was used, with eight replications. Plots consisted of plant sampling periods, which were conducted in the vegetative period (17 days after emergence -DAE), the grain fill period (between 73 and 80 DAE) and at end of the cycle (120 DAE). Castor leaves accumulated most of dry matter (DM) and macroand micronutrients in the vegetative period, regardless of the growing period. In the following cycle periods, most of biomass and nutrients were located in the reproductive structures and grains, especially in the offseason crop. It was concluded that leaves and stems are strong nutrient sinks in the castor plant in season crops, while lower water availability during off-season induces plants to use physiological mechanisms to allocate more resources (biomass and nutrients) for their reproduction.Additional keywords: dry matter; macronutrients; micronutrients; Ricinus communis; source/sink relation. ResumoObjetivou-se neste estudo avaliar a partição de matéria seca, o acúmulo e a distribuição de macro e micronutrientes em mamona de porte baixo, cultivada na safra e na safrinha. Os experimentos foram conduzidos na safra de 2005-2006 e na safrinha de 2006, em Latossolo Vermelho distroférrico. Utilizou-se do delineamento em blocos casualizados, com oito repetições. As parcelas foram constituídas pelas épocas de coleta de plantas, que foram realizadas na fase vegetativa (17 dias após a emergência -DAE), na fase de enchimento de grãos (entre 73 e 80 DAE) e no final do ciclo (120 DAE). As folhas da mamoneira, na fase vegetativa, acumularam a maior parte da matéria seca (MS) e dos macros e micronutrientes, independentemente da época de cultivo. Nas fases seguintes do ciclo, a maior proporção de biomassa e nutrientes estava presente nas estruturas reprodutivas e nos grãos, especialmente no cultivo de safrinha. Conclui-se que, no cultivo de safra, as folhas e os caules são fortes drenos de nutrientes na planta de mamona, enquanto na safrinha a menor disponibilidade hídrica faz com que as plantas utilizem mecanismos fisiológicos para alocar mais recursos (biomassa e nutrientes) para sua reprodução.Palavras-chave adicionais: macronutrientes; matéria seca; micronutrientes; relação fonte/dreno; Ricinus communis.

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Section: Resultssupporting

confidence: 82%

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Castro¹,

Crusciol²,

Fernandes³

et al. 2017

Científica

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“…2 to 5) help to explain why this genotype had lower productivity (data not shown) as compared to the other genotypes but clearly other physiological traits should contribute to this problem. SLW represents leaf thickness and gives an estimative of the proportion between the assimilatory surface and the veins that sustain those leaf tissues (Evans, 1972, Cruz et al, 2004. Plants with a higher SLW are usually greener because they have more cell layers and chloroplasts/ chlorophyll, what could represent a higher photosynthetic potential.…”

Section: Discussionmentioning

confidence: 99%

“…To determine the shoot and root dry weight (SDW and RDW, respectively) at the end of the experiment (92 DAS), the plant organs (leaves, stem and roots) were oven-dried at ), leaf weight ratio (LWR, g leaf dry weight g -1 total plant dry weight), stem weight ratio (SWR, g stem dry weight g -1 total plant dry weight) and leaf area ratio (LAR, m 2 leaf area g -1 total plant dry weight) (Cruz et al, 2004). …”

mentioning

confidence: 99%

“…The leaf area ratio (LAR) is a morphological characteristic that represents the leaf area which is available to the photosynthetic process (Cruz et al, 2004), while the leaf weight ratio (LWR) characterize the plant capacity to mobilize the produced assimilates to form new assimilator organs (leaves). The Golden genotype showed the highest LAR and LWR values (probably related to the higher LN showed at the end of the experiment (Figure 4), while Tainung presented the lowest values for these parameters (Figure 8).…”

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confidence: 99%

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Morphological analysis and photosynthetic performance of improved papaya genotypes

Netto

Campostrini

Azevedo

et al. 2009

Braz. J. Plant Physiol.

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Brazil is the largest world producer of papaya and the third largest exporter despite of only 1.5 to 2.0% of its production is exported. Such an underexplored exportation potential highlight the necessity for physiological studies on new cultivars and hybrids to verify their agronomic and commercial viability. Two Brazilian states, Bahia and Espirito Santo, are responsible for 80% of national production. Papaya can also be an agricultural alternative to north / northeast of Rio de Janeiro, because the region is close to consumer centers and have similar environmental conditions of the most productive regions. Nevertheless, it is worth to develop cultivars that can express the highest yield potential in this region. The aim of this work was to characterize physiologically two hybrids developed for the north/northeast of Rio de Janeiro (UENF/Caliman 01 and JS12) in comparison with three top commercial genotypes (Golden, Sunrise Solo 7212 and Tainung) of Carica papaya L.. The cv. Golden presented the lowest shoot and root growth, the lowest height, shrunk diameter, specific leaf weight, less efficiency in electrons transport per sample area and show the lowest ability to synthesized total chlorophylls in comparison with the others genotypes. At noon, this genotype showed higher stomatal conductance, related to the leaf-air vapor pressure deficit, which lead to higher transpiration rate and intrinsic water use efficiency. No differences were detected in the photosynthetic rates among the five genotypes suggesting that the UENF`s hybrids are endowed with similar photosynthetic capacity and morphological characteristics to the top commercial genotypes. The relevance of this characterization to drive future successful genetic improvement programs will be discussed.

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“…Segundo CRUZ et al (2004), o nitrogênio tem efeitos sobre a assimilação de carbono, produção de biomassa e rendimento das culturas. Desta forma, plantas crescidas com quantidade inadequada de nitrogênio, como é o caso do tratamento em que o N é fornecido totalmente aos 20 DAS, não expressam totalmente seu potencial genético, pois, em tais condições, ocorre uma série de alterações morfológicas e fisiológicas, afetando, negativamente, o crescimento das plantas.…”

Section: Tabela 4 -Valores Médios Do Comprimento Da Haste Principal (unclassified

Frequência de irrigação e aplicação de N em meloeiro irrigado por gotejamento nas condições semiáridas do Nordeste

Filho¹,

Bezerra²,

Silva³

et al. 2014

Científica

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Crescimento e partição de matéria seca e de carbono no mamoeiro em resposta à nutrição nitrogenada

Cited by 12 publications

References 25 publications

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Morphological analysis and photosynthetic performance of improved papaya genotypes

Frequência de irrigação e aplicação de N em meloeiro irrigado por gotejamento nas condições semiáridas do Nordeste

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