The effectiveness of short-term microwave irradiation on the process of seed extraction from Scots pine cones (Pinus sylvestris L.)

Aniszewska, Monika; Gendek, Arkadiusz

doi:10.3832/ifor3089-012

Cited by 5 publications

(2 citation statements)

References 17 publications

(18 reference statements)

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“…Higher temperature intensities (a function of the temperature reached and the time of exposure) has been shown to be a key factor in cone opening for seed release and also influences seed germination energy, rate and capacity [23][24][25][26]. Heat tolerance and thermal shock resistance as indicated by germination energy is shown to be dependent on species, cone and seed moisture content [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Seed Extraction Period and Germination Temperature on Viability of Pinus patula Under Controlled Conditions

Onyango,

Inoti,

Maara

et al. 2024

AJRAF

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A number of coniferous species have demonstrated varied cone responses to the temperature intensities for seed release and subsequent seed germination behaviour. This study investigated the interactions of cone physical characteristics (weight and width), exposure duration (6,12 and 24 hours) at a fixed extraction temperature (65°C) and the germination temperature (22, 27 and 32°C) on seed quality of Pinus patula. The experimental design was a factorial experiment (4×3×3) laid down in a completely randomized design (CRD), with thirty-six treatments replicated 3 times. Analysis of the difference in means from the three factor effects from ANOVA was performed using R Statistical software. Where significant differences were observed, post hoc tests were carried out to separate means using the Tukey test at 5 % significance level. Results showed significant (p=0.001) differences in germination performance as a result of cone characteristics, extraction exposure periods, and germination chamber conditions. Seeds extracted from heavy cones and exposed to germination temperature of 32℃ demonstrated the highest germination percent at 90% while the lowest was 20% from light cones exposed to similar germination temperature conditions. Negative and significant correlation coefficients were observed in germination of seeds from narrow and light cones, thus cone sorting for heavy and wide cones was recommended for better germination performance of P. patula seed germplasm.

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Section: Introductionmentioning

confidence: 99%

Effect of Seed Extraction Period and Germination Temperature on Viability of Pinus patula Under Controlled Conditions

Onyango,

Inoti,

Maara

et al. 2024

AJRAF

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“…In Poland, seeds from larch cones are extracted using pine and spruce extraction programs in seed extraction cabinets using two-step extraction programs with variable drying temperature [ 26 ] to prevent thermal damage to the seeds [ 1 ]. Researchers seek new devices and technological solutions to make the process more effective, for example, by microwave irradiation of cones in the initial stage of seed extraction [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Kinematics of Scale Deflection in the Course of Multi-Step Seed Extraction from European Larch Cones (Larix decidua Mill.) Taking into Account Their Cellular Structure

2021

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The objective of the study was to elucidate the kinematics of cone opening in the European larch (Larix decidua Mill.) during a four-step seed extraction process and to determine optimum process time on that basis. Each step lasted 8 h with 10 min of water immersion between the steps. The study also described the microscopic cellular structure of scales in cones with a moisture content of 5% and 20%, as well as evaluated changes in cell wall thickness. The obtained results were compared with the structural investigations of scales conducted using scanning electron microscopy (SEM) of characteristic sites on the inner and outer sides of the scales. The greatest increment in the scale opening angle was noted on the first day of the process (34°) and in scales from the middle cone segment (39°). In scales with a moisture content of 5% and 20%, the greatest changes in cell wall thickness were recorded for large cells (57%). The inner and outer structure of scales differed in terms of the presence and size of cells depending on the moisture content of the cones (5%, 10%, or 20%). The study demonstrated that the moisture content of cones was the crucial determinant of the cellular structure and opening of scales in larch cones. The scale opening angle increased with decreasing moisture content but did not differ significantly for various segments of cones or various hours of the consecutive days of the process. This finding may lead to reducing the seed extraction time for larch cones. The internal and external structure of scales differed depending on moisture content, which also determined the size and wall thickness of cells.

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Effects of electromagnetic waves on the moisture content of cones and the quality of extracted seeds in the Norway spruce and European larch

Aniszewska,

Gendek,

Tulska

et al. 2023

New Forests

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The publication describes research investigating the effects of microwaves on seeds extracted from Norway spruce (Picea abies) and European larch (Larix decidua) cones. The objective of the conducted experiments was to determine how electromagnetic radiation influences the quality of those seeds. The study material was heated in a microwave-emitting device for 7 or 10 s at four power settings (800, 620, 440, or 130 W). The evaluated parameters included changes in the moisture content and weight of the studied cones following the applied time and power variants of exposure to microwaves, as well as the quality of the obtained seeds expressed in terms of germination energy (GE) and capacity (GC). Increasing the power of microwaves resulted in a greater decrease in the moisture content of cones, but it was not possible to find such a relationship for larch cones, especially for large cones. In most cases, the irradiation of larch cones with electromagnetic waves resulted in class I seeds, in contrast to spruce seeds, which could not be assigned to any class. Our findings show that for optimum results larch cones may be exposed to microwaves at a power not greater than 620 W and for a time not longer than 10 s. Spruce cones were found to be very sensitive to radiation; in their case no microwave treatment should be applied as it adversely affects seed viability.

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The effectiveness of short-term microwave irradiation on the process of seed extraction from Scots pine cones (Pinus sylvestris L.)

Abstract: Biogeosciences and Forestry Biogeosciences and Forestry The effectiveness of short-term microwave irradiation on the process of seed extraction from Scots pine cones (Pinus sylvestris L.

Cited by 5 publications

References 17 publications

Effect of Seed Extraction Period and Germination Temperature on Viability of Pinus patula Under Controlled Conditions

Effect of Seed Extraction Period and Germination Temperature on Viability of Pinus patula Under Controlled Conditions

The Kinematics of Scale Deflection in the Course of Multi-Step Seed Extraction from European Larch Cones (Larix decidua Mill.) Taking into Account Their Cellular Structure

Effects of electromagnetic waves on the moisture content of cones and the quality of extracted seeds in the Norway spruce and European larch

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