Fisiologia e produção da soja tratada com cinetina e cálcio sob deficit hídrico e sombreamento

Fioreze, Samuel Luiz; Rodrigues, João Domingos; Carneiro, João Paulo Costa; Silva, André do Amaral; Lima, Marcelo Bruno

doi:10.1590/s0100-204x2013001100003

Cited by 31 publications

(23 citation statements)

References 18 publications

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“…West Indian cherry plants irrigated with 3.8 dS m -1 water also showed reduction in the %D, 13.33% for every 25% increase in K 2 O recommendation, which is equivalent to a reduction of about 48% in the %D of West Indian cherry plants fertilized with 125% K 2 O dose, compared with those under 50% of the recommendation of Musser (1995). Cell membrane damage is caused by the release of ions, leading to greater loss in integrity and destabilization of the cell membrane, and the quantity of leachates is determined considering that the higher the content leaked from the cell, the greater the damage caused to the cell membrane (ATAÍDE, 2012), which may indicate a mechanism that prevents tissue desiccation due to the reduction in the leaf osmotic component (FIOREZE et al, 2013).…”

Section: Results and Discussonmentioning

confidence: 99%

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Pinheiro¹,

Lima²,

Gheyi³

et al. 2019

Biosci. J.

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Agricultural exploitation in the semi-arid region of Northeast Brazil depends on the use of irrigation to guarantee safe production of crops. Nevertheless, the waters commonly used in this region have high levels of salts and require management strategies that make their use possible in agriculture. In this context, the present study aimed to evaluate water relations, photosynthetic pigments and growth of grafted West Indian cherry as a function of saline water irrigation and potassium (K) fertilization. The study was conducted under greenhouse conditions in lysimeters filled with eutrophic Regolithic Neosol with sandy loam texture, in the municipality of Campina Grande-PB, Brazil. Treatments were distributed in randomized blocks and consisted of two factors: two levels of irrigation water electrical conductivity -ECw (0.8 and 3.8 dS m -1 ) and four K doses (50, 75; 100 and 125% of the recommendation), with three replicates and one plant per plot. The 100% dose corresponded to 19.8 g of K 2 O per plant per year. The West Indian cherry crop was sensitive to water salinity of 3.8 dS m -1 in the post-grafting phase, resulting in a decline in photosynthetic pigment content and growth. Increasing K doses reduced the percentage of cell membrane damage and promoted increase in the synthesis of chlorophyll a and carotenoids in West Indian cherry plants. There was significant interaction between salinity levels and K doses for the leaf osmotic potential, water saturation deficit, percentage of cell membrane damage and chlorophyll b content in West Indian cherry plants.

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Section: Results and Discussonmentioning

confidence: 99%

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Pinheiro¹,

Lima²,

Gheyi³

et al. 2019

Biosci. J.

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“…In the treatment with supplemental fertilization of 100 mg kg -1 Ca, the root growth rate was higher than in the other treatments among 15 and 34 days. Ca is a nutrient with a preponderant role in plant root growth (Ritchey et al, 1982;Domingues et al, 2016), as it is involved in the process of cell division, differentiation and elongation (Fioreze et al, 2013). Thus, adequate Ca availability in contact with the root system is fundamental for plant survival, since this nutrient does not translocate from the shoot to the root tip (Caires et al, 2001).…”

Section: Ca Experimentsmentioning

confidence: 99%

Rooting of sweet potato seedlings submitted to supplemental calcium and phosphorus nutrition on substrate

Ichikawa

Fernandes

Mota

2019

Rev. bras. eng. agríc. ambient.

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The objective of this study was to evaluate the rooting and growth of sweet potato seedlings in trays in response to substrate supplementation with calcium (Ca) and phosphorus (P). Two greenhouse experiments were conducted in a randomized block design with a split plot scheme and eight repetitions. In the Ca experiment, the plots were the doses of 0, 100 and 200 mg kg-1 of Ca, and in the P experiment, by the doses of 0, 150 and 300 mg kg-1 of P. In both experiments, the subplots corresponded to the sampling time of seedlings (15, 30, 45, 60 and 75 days after planting). The Ca present in the substrate was sufficient to promote the proper rooting and growth of sweet potato seedlings in the trays. The Ca supply in excess (200 mg kg-1) adversely affected the growth of seedlings that remained in the tray for more than 60 days. Although the seedlings supplied with P showed higher root growth rate after 45 days, the initial P available in the substrate was sufficient to promote the adequate growth of the seedlings in the trays until 60 days.

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“…Water deficit takes place when the plant transpiration rate exceeds the water uptake rate (Taiz and Zeiger 2013), leading to a physiological imbalance (Fioreze et al 2013), triggering a series of reactions including the reduction of yields, grains and, in extreme cases, death of organs or the whole plant .…”

Section: Introductionmentioning

confidence: 99%

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

Bulegon¹,

Battistus²,

Guimarães³

et al. 2017

Aust J Crop Sci

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This study evaluated the tolerance of U. ruziziensis under severe water stress conditions and its recovery when rehydrated, based in responses of relative leaf water content and gas exchange of the crop. The experiment was conducted in green house in Oxisol. The experimental design was a randomized block design, totaling five treatments, was represented by inoculation of A. brasilense strains AbV5 + AbV6, as follow: seed inoculation, foliar spray application, seed inoculation + foliar spray application, a non-inoculated control with water deficit treatment and a irrigated control without inoculation. Drought was imposed 45 days after sowing, after the vessel was irrigated until saturation of the substrate, by total removal of irrigation for six days, and evaluated three days after the resumption of water, evaluating gravimetric soil moisture, relative leaf water content and gas exchange. Soil moisture showed non variation to treatments non irrigated, but the relative leaf water content was lower in the control without water. The control and the treatment inoculated with A. brasilense in seeds exhibited lower rates of gas exchange. Recovery full of photosynthetic activity occurred three days after rehydration in all treatments. A. brasilense foliar sprayed is efficient to increase the tolerance of U. ruziziensis to water deficit and presented higher photosynthetic rates even under conditions of severe water deficit.

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Fisiologia e produção da soja tratada com cinetina e cálcio sob deficit hídrico e sombreamento

Cited by 31 publications

References 18 publications

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Saline water and potassium fertilization in cultivation of grafted west indian cherry BRS 366 Jaburu

Rooting of sweet potato seedlings submitted to supplemental calcium and phosphorus nutrition on substrate

Physiological responses of Urochloa ruziziensis inoculated with Azospirillum brasilense to severe drought and rehydration conditions

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