&lt;b&gt;Improvement of production and fruit quality of pitayas with potassium fertilization

Fernandes, Denison Ramalho; Moreira, Rodrigo Amato; Cruz, Maria do Céu Monteiro da; Rabelo, Josimara Mendes; Oliveira, Jéssica de

doi:10.4025/actasciagron.v40i1.35290

Cited by 16 publications

(19 citation statements)

References 15 publications

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“…According to Sarment et al (2008), when N supply is performed under conditions of low K availability, there is a low efficiency of N use by the plant. Almeida et al (2016), when evaluating the nutritional status of pitaya plants submitted to different doses of N and K, observed the high demand of this species by K, demanding around twice more K than N. Fernandes et al (2018) verified the importance of K also on the increase of production and quality of pitaya fruits.…”

Section: Resultsmentioning

confidence: 96%

Pitaya (Hylocereus undatus) initial growth in function to NPK fertilization

Gonçalves

Pinto

Corrêa

2020

R. Agrogeoambiental

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Pitaya is considered a very promising cactus fruit, however, there is a lack of studies that support the definition of more suitable production systems. Thus, the objective of this work was to evaluate the effect of NPK mineral fertilization on pitaya initial growth, aiming the definition of nutritional and fertilization management appropriate to the agricultural exploitation of the crop. The assay was conducted in the greenhouse of the Biotechnology Laboratory. The propagating part of pitaya is its stem known as cladode. The cladodes were planted in pots of 8.0 dm3, filled with substrate based on soil from termites. The donor matrices of vegetative material were young specimens of white-fleshed pitaya (Hylocereus undatus). 72 cuttings of 30.0 cm in length were used. The experimental design was in randomized blocks with 9 treatments (NPK doses) and 4 replications, totalizing 36 experimental plots. Each experimental plot was composed of 2 cuttings. Number of cladodes, sum of cladodes length, fresh cladodes mass, dry cladodes mass, root system length, root system fresh mass and root system dry mass were evaluated at 160 days after planting the morphological characters. The results of the variables were submitted to the analysis of variance and the means grouped by the Scott-Knott test at 5% of probability. NPK fertilization affected the initial growth of the aerial part and the root system of pitaya. The greatest development of pitaya was provided by 450.0 mg dm-3 of N, 250.0 mg dm-3 of P and 250.0 mg dm-3 of K.

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Section: Resultsmentioning

confidence: 96%

Pitaya (Hylocereus undatus) initial growth in function to NPK fertilization

Gonçalves

Pinto

Corrêa

2020

R. Agrogeoambiental

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“…Plants properly fertilized with K produce pitayas with a better appearance and flavor, and higher productivity (Fernandes et al, 2018). Therefore, it is fundamental to identify the amount of nutrients exported by the fruit to support fertilization, aiming to replace mineral nutrients in the soil to increase the area under cultivation and increase the productivity of commercial-quality pitaya.…”

Section: Initial Research Conducted In Brazil Highlightedmentioning

confidence: 99%

“…Due to the lack of this information, specifically in Brazil, management has been carried out differently wherever this species is cultivated, resulting in varying levels of productivity, entre 2 to 9 tons per hectare (Moreira et al, 2012;Fernandes et al, 2018). However, mineral fertilization is critical, especially when the annual yields of pitaya orchards are high (between 20 to 45 tons per hectare).…”

Section: Introductionmentioning

confidence: 99%

“…However, mineral fertilization is critical, especially when the annual yields of pitaya orchards are high (between 20 to 45 tons per hectare). Evidence supporting the need for fertilization has recently been demonstrated through the work of Nobel and De la Barrera (2002), Weiss et al (2009), and Fernandes et al (2018), who tested the effects of mineral application.…”

Section: Introductionmentioning

confidence: 99%

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Increase of nutrients export and production of pitaya whit potassium fertilization

et al. 2020

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Characterization works of pitayas show that the potassium (K) is the nutrient most exported, thus, influences in the productivity and quality of this fruit. However, these researches do not report the nutrients export by pitaya's associating the fertilization carried out in the orchard, information that is relevant to make the nutrients reposition adequate at the time of fertilization. The research was carried out to evaluate the supply of K2O in the export of nutrients and productivity of the Hylocereus undatus and Hylocereus polyrhizus pitaya species. The analysis was carried out in the mature fruits harvested in two harvests. Potassium fertilization was performed at doses of 0; 50; 100 and 200 g of K2O per plant. Nutrient export per ton of fruit was calculated from the determination of the nutrient levels and the dry matter of the pitaya pulp. The export of nutrients by the pitaya of the species H. undatus and H. polyrhizus occurs in the following order: K>N>P>Ca>Mg> and Mn>Fe>Cu>Zn>B. These species of pitaya have similar nutritional requirements, enabling them to be receive same fertilization management. The amount of nutrients exported was higher in plants fertilized with potassium due to the higher productivity achieved. Orchards of pitaya that reach high productivity require a greater quantity of nutrients, due to the increase export by the fruits.

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“…is a tropical and subtropical world fruit that is highly valued as a functional food [23,24], and it usually refers to fruit of the genus Hylocereus of the Cactaceae family. is a tropical and subtropical world fruit that is highly valued as a functional food [23,24], and it usually refers to fruit of the genus Hylocereus of the Cactaceae family.…”

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confidence: 99%

RNA‐seq‐based selection of reference genes for RT‐qPCR analysis of pitaya

et al. 2019

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Reverse‐transcription quantitative real‐time PCR (RT‐qPCR) is a primary tool for measuring gene expression levels, and selection of appropriate reference genes is crucial for accurate and reproducible results of gene expression under various experimental conditions. However, no systematic evaluation of reference genes in pitaya (Hylocereus undatus Britt.) has been performed. Here, we examined the expression of five candidate reference genes, namely elongation factor 1‐alpha (HuEF1‐α), 18S ribosomal RNA (Hu18S rRNA), ubiquitin (HuUBQ), actin (HuACT), and ubiquitin‐conjugating enzyme (HuUQT), under different conditions in pitaya. The expression stabilities of these five genes were evaluated using two computation programs: geNorm and NormFinder. The results were further validated by normalizing the expression of the phosphoglycerate kinase (HuPGK) and ethylene‐responsive transcription factor (HuERF) genes. Our results indicate that combined use of HuUBQ and HuUQT is the most stable reference under all of the experimental conditions examined. HuEF1‐α, HuUBQ, and HuUQT are the top three most stable reference genes under salt stress, drought stress, and heat stress, and across different cultivars. HuEF1‐α, HuACT, and HuUQT exhibited the most stable expression patterns across different tissues. Our results will allow researchers to select the most appropriate reference genes for gene expression studies of pitaya under different conditions.

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<b>Improvement of production and fruit quality of pitayas with potassium fertilization

Cited by 16 publications

References 15 publications

Pitaya (Hylocereus undatus) initial growth in function to NPK fertilization

Pitaya (Hylocereus undatus) initial growth in function to NPK fertilization

Increase of nutrients export and production of pitaya whit potassium fertilization

RNA‐seq‐based selection of reference genes for RT‐qPCR analysis of pitaya

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