Estimativa da produção de sementes de porta-enxertos cítricos por meio da massa de frutos

Zucoloto, Moisés; Costa, Marcio Gama da; Carvalho, Lorena Moreira; Santos, Dierlei dos; Siqueira, Dalmo Lopes de

doi:10.1590/s0034-737x2011000100019

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…This town has a 650 m average altitude, the weather -according to the Köppen classification -is a Cwb type, mesothermic, with a dry winter and rainy summer. The average annual precipitation is 1200 mm and the average annual temperature is 20,5ºC, with a minimum of 14,6ºC and maximum of 26,3ºC (Zucoloto et al, 2011).…”

Section: Methodsmentioning

confidence: 99%

Eucalyptus Logs Drying at High Temperatures

et al. 2017

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The objective of this work was to evaluate the drying speed of Eucalyptus urophylla logs in high temperatures and the influence of the presence or absence of bark and also the diameter of the log in the drying rate. Eucalyptus logs 60 cm long were divided into three diameter classes: 8-12 cm; 12,1-16 cm and 16,1-20 cm. The logs were dried in a heater with forced air circulation, in the presence or absence of bark in five temperatures: 50, 75, 100, 125 and 150ºC. The mass and the initial moisture were determined from each log and the water loss was kept up with periodic weightings, closing the drying process when the logs reached 20% moisture. The drying rate of the logs was calculated using the ratio between the total loss of moisture and the time in hours in order to reach the established moisture. It was concluded that the increase in temperature promotes the raise of the drying ratio, as being higher for smaller logs in relation to bigger ones and in addition to this, the bark effect was not significant in the drying of eucalyptus logs above 100ºC. It was also concluded that the best conditions for the operation of artificial dryers for Eucalyptus logs containing bark and separated in diameter classes would be at 125ºC.

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Section: Methodsmentioning

confidence: 99%

Eucalyptus Logs Drying at High Temperatures

et al. 2017

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“…Due to phytosanitary problems that citrus has presented in recent years and the advance of production to new areas, the use of healthy and certified seedlings is an important preventive measure to prevent the occurrence of diseases in Brazilian orchards, such as huanglongbing -HLB (Candidatus Liberibacter spp) (Bassanezi et al, 2011). One of the important steps in the formation of productive orchards is the use of rootstocks with recognized resistance to certain diseases, requiring seeds with sufficient quality and quantity to meet demands (Zucoloto et al, 2011). The expansion of the genetic base related to varieties used as rootstocks, including those able to adapt to abiotic stresses, has decisively contributed to achieve economically higher yields (Brito et al, 2008…”

Section: Introductionmentioning

confidence: 99%

Physiological quality of citrandarins, Poncirus trifoliata and Sunki mandarin seeds

et al. 2019

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Rangpur lime is the rootstock most used in Brazil, mainly due to its resistance to drought; however, it is susceptible to several diseases, requiring the search for other rootstocks tolerant to factors limiting citrus cultivation. In addition, the Brazilian legislation stipulates that citrus seeds can only be commercialized with at least 50% germination rate. Thus, the aim of this work was to evaluate the physiological quality of seeds of seven citrus rootstocks. The following citrus fruits were harvested: Poncirus trifoliata, Sunki mandarin and their hybrids –citrandarins (70, 106, 254, 299 and 310). Fruit mass, diameter and height were measured. Seeds were extracted from fruits, counting the number of normal seeds (not aborted). Seeds were dried up to 20% water content and stored for 3, 6, 9 and 12 months. The physiological quality of seeds was evaluated before storage (time 0) up to 12 months of storage. The quality of Poncirus trifoliata, Sunki mandarin and citrandarins 70, 106, 254, 299 and 310 seeds was reduced during storage. However, their germination rate remained above 50%, evidencing that seeds of all rootstocks could be marketed until 12 months of storage. The new rootstocks tested have seeds with physiological quality compatible with their parents, in compliance with current legislation.

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“…The propagation of citrus seedlings is made by the grafting technique, using seeds for the production of rootstocks. In this context, the demand for high quality seeds to obtain these rootstocks is increasing (Zucoloto et al, 2011). Normative Instruction 48 of the Ministry of Agriculture, Livestock and Supply (MAPA) of 24 September 2013 requires that citrus seeds must be analyzed in accordance with the Seed Analysis Rules and may only be marketed with at least 50% germination.…”

Section: Introductionmentioning

confidence: 99%

Maturation and physiological quality of IAC-863 Rangpur lime seeds

et al. 2019

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There is a growing demand for high quality seeds to obtain citrus rootstocks. Normative Instruction 48 (MAPA) of September 24, 2013, requires minimum of 50% germination for the marketing of citrus seeds. Harvest season is one of the stages of seed production with great importance to ensure quality, which makes knowing its maturation process an important step. Thus, the objective of this study was to monitor physicochemical changes in IAC-863 Rangpur lime fruits in order to characterize the physiological maturity of seeds, and to define the ideal harvest point in order to obtain seeds with high physiological quality to obtain rootstocks. Physicochemical analysis of fruits (mass loss, color, soluble solids and acidity) and analysis of seeds (water content, germination and emergence) was performed. Higher germination results were observed in seeds obtained from fruits with higher color index and soluble solids content. The storage of IAC-863 Rangpur lime fruits after harvest increases germination rate, especially in mid-season fruits.

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Estimativa da produção de sementes de porta-enxertos cítricos por meio da massa de frutos

Cited by 8 publications

References 3 publications

Eucalyptus Logs Drying at High Temperatures

Eucalyptus Logs Drying at High Temperatures

Physiological quality of citrandarins, Poncirus trifoliata and Sunki mandarin seeds

Maturation and physiological quality of IAC-863 Rangpur lime seeds

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