scholarly journals Germination potential of Hymenaea courbaril L. in different maturation stages

2021 ◽  
Vol 42 (6supl2) ◽  
pp. 3667-3684
Author(s):  
Hugo Roldi Guariz ◽  
◽  
Halley Caixeta de Oliveira ◽  
Huezer Viganô Sperandio ◽  
Jean Carlo Baudraz de Paula ◽  
...  
Keyword(s):  
Leaf Area ◽  
Relative Frequency ◽  
Germination Rate ◽  
Germination Percentage ◽  
Seedling Production ◽  
Hymenaea Courbaril ◽  
Germination Time ◽  
Germination Potential ◽  
The Matrix ◽  
Maturation Stages

The production of quality forest seedlings in large quantities is essential for the restoration of environments that have been deforested and degraded. However, obtaining seeds with high vigor is a challenge for several tree species native to Brazil. The objective of this work was to verify the germination potential of jatobá-da-mata seeds at different stages of maturation, in order to favor the production of seedlings of this species in nurseries. The seeds were extracted from green and ripe fruits detached from the mother plant and ripe fruits collected from the ground. The germination percentage, average germination time, emergence speed index, average speed, relative frequency, leaf area of the seedling, and length of the aerial part and root were measured. The planting was carried out with mechanically scarified and intact seeds from each maturation group. The results indicated that non-scarified green seeds can be used for planting and seedling production, as they do not require pre-germination treatment and have a favorable germination percentage (79%). Fruit seeds harvested from the ground, on the other hand, needed a method to overcome integumentary dormancy, such as mechanical scarification, obtaining a germination rate of 85%. The seeds of ripe fruits harvested in the matrix showed greater vigor, with a higher percentage of germination (96 to 100%), a higher emergence speed index, shorter average germination time, and seedlings with greater leaf area and greater length of shoot.

scholarly journals Effect of Light Emitting Diode (LED) Spectrum at Seedlings Production for Optimal Growth on Different Type of Lettuce in MARDI Plant Factory

2021 ◽  
Author(s):  
Mohamed Hafeifi Basir ◽  
Intan Nadhirah Masri
Keyword(s):  
Leaf Area ◽  
Plant Biomass ◽  
Light Emitting Diode ◽  
Germination Percentage ◽  
Seedling Production ◽  
Full Spectrum ◽  
Spad Value ◽  
Fresh Vegetables ◽  
Plant Factory ◽  
Production Area

Seedling production is a crucial part of the production of fresh vegetables in a plant factory. Light is one of the necessities for plants to produce a healthy seedling before being transplanted to the production area. Different light formulations resulted in different growth performances of the plant. Hence, this study was conducted to aim for suitable light formulation on various types of lettuce in the MARDI Plant Factory. The study was conducted in two stages: 1) seedling production and 2) production area. Treatments were evaluated at the seedlings' production stage using the split-plot experimental design with four replications. LED light treatments (LT) was the main factor with the various ratio of spectrum colour of Red (R), Blue (B), Green (G) and full spectrum. (LT 1; 5R:1B, LT 2; 1R:1B, LT 3; 1R: 2B, LT 4; 2R:1B, LT 5; 4R:1B:1G and LT 6; Full spectrum as control). The sub-factor was lettuce variety (V1; Butterhead, V2; Green Coral, V3; Red Coral and V4; Mini Cos). Variables measured at seedlings production were seed germination. Growth biomass and SPAD value were evaluated in the production area. At seedlings production, the full spectrum lighting shows significant seeds germination percentage compared to other LED lighting, and V1 performed well on germination percentage and time compare to other varieties. The interaction between light treatments and lettuce was observed on the leaf numbers, shoot fresh weight, leaf area, and the shoot-root ratio at the production area. LT 1 and LT 5 on butterhead and green coral significantly affected the number of leaves and leaf area, which were relatively influenced by light quality and ambient temperature. The yield on green coral lettuce grown under LT 1, LT 2, and LT 5 was significantly higher than others. However, plant biomass and SPAD value for all treatments were not significantly different. The allometry of plant was expressed on a shoot-root ratio with LT 2 on green coral shows a significantly higher shoot-root ratio than other treatments. The study's findings showed that light treatment with Red and Blue LED ratio of 5:1, 1:1, and Red, Blue, and Green LED ratio of 4:1:1 light arrangement on the seedling's productions provided optimal growing conditions in the production area butterhead and green coral lettuce in MPF cultivation.

scholarly journals Salinity reduced growth PS2 photochemistry and chlorophyll content in radish

2007 ◽  
Vol 64 (2) ◽  
pp. 111-118 ◽  
Author(s):  
Muhammad Jamil ◽  
Shafiq ur Rehman ◽  
Kui Jae Lee ◽  
Jeong Man Kim ◽  
Hyun-Soon Kim ◽  
...  
Keyword(s):  
Leaf Area ◽  
Chlorophyll Content ◽  
Salt Concentration ◽  
Germination Rate ◽  
Photochemical Efficiency ◽  
Germination Percentage ◽  
Photochemical Quenching ◽  
Leaf Water Content ◽  
Spad Value ◽  
Salt Level

When plants are grown under saline conditions, photosynthetic activity decreases leading to reduced plant growth, leaf area, chlorophyll content and chlorophyll fluorescence. Seeds and seedlings of radish (Raphanus sativus L.) were grown in NaCl solutions under controlled greenhouse conditions. The NaCl concentrations in complete nutrient solutions were 0 (control), 4.7, 9.4 and 14.1 dS m-1. The salinity reduced germination percentage and also delayed the germination rate as the salt level increased. Lengths and fresh weights of root and shoot decreased with the increasing salt concentration. Furthermore, photochemical efficiency of PS2 (Fv/Fm), photochemical quenching coefficient (qP), non photochemical quenching coefficient (qN), leaf area and chlorophyll content (SPAD value) were also reduced (P < 0.001) by salt stress. In contrast, the Fo/Fm ratio increased with increasing salt concentration while salinity showed no effect on the efficiency of excitation captured by open PS2 (Fv'/Fm'), electron transport rate (ETR), and leaf water content. Linear regression shows that the photochemical efficiency of PS2 (Fv/Fm) had a positive relationship with the photochemical quenching coefficient (qP), leaf area and chlorophyll content but had no relation with Fv'/Fm', Fo/Fm, and qN.

scholarly journals Morphometry and Germination of Passovia pyrifolia, Struthanthus marginatus and Phoradendron mucronatum Diaspores

2018 ◽  
Vol 36 (0) ◽  
Author(s):  
J.M.L. AZEVEDO ◽  
C.G.G. SANTOS ◽  
C.S. CAIRES ◽  
J.C. ARAÚJO NETO ◽  
R.C. SOUZA
Keyword(s):  
Moisture Content ◽  
Germination Rate ◽  
Germination Percentage ◽  
Percentage Germination ◽  
Essential Characteristic ◽  
Germination Time ◽  
Randomized Design ◽  
Different Temperatures ◽  
Mean Germination Time ◽  
Completely Randomized Design

ABSTRACT: The goal of this work was to characterize morphometrically diaspores from three species of mistletoes (Passovia pyrifolia, Struthanthus marginatus e Phoradendron mucronatum), as well as to study its germination behavior according to temperature and luminosity. In germination tests, the completely randomized design was used, in factor scheme 4 x 2, with 4 replications of 15 diaspores. The factors for the first test were different temperatures and two diaspore conditions (intact and without epicarp). In the second test, factors were different light qualities and two diaspore conditions. The analyzed variables were: germination percentage, germination rate index (GRI) and mean germination time (MGT). Mistletoe’s diaspores present an elliptic shape with viscin layer, an essential characteristic for the dispersion of the species. In addition to this, they present a distinction as for the moisture content when compared to the Loranthaceae and Viscaceae, where the latter presents the highest content. Germination is greater at the alternated temperature of 20-30 oC for P. pyrifolia and P. mucronatum diaspores and 20 oC for S. marginatus. Luminosity interfered in the germination of P. mucronatum and S. marginatus but did not influence P. pyrifolia. The diaspore condition influenced the germination of the three studied species, observing a significant increase in their germination when the epicarp was removed. Temperature and luminosity interfere directly in the GRI and MGT of the three mistletoes species.

scholarly journals Germination Response of MR 219 Rice Variety to Different Exposure Times and Periods of 2450 MHz Microwave Frequency

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Daryush Talei ◽  
Alireza Valdiani ◽  
Mahmood Maziah ◽  
Mohammad Mohsenkhah
Keyword(s):  
Seed Germination ◽  
Root Length ◽  
Germination Rate ◽  
Rice Variety ◽  
Microwave Frequency ◽  
Germination Percentage ◽  
Rice Seed ◽  
Germination Time ◽  
Primary Shoot ◽  
Mean Germination Time

Germination is a key process in plants' phenological cycles. Accelerating this process could lead to improvment of the seedling growth as well as the cultivation efficiency. To achieve this, the effect of microwave frequency on the germination of rice seeds was examined. The physiological feedbacks of the MR 219 rice variety in terms of seed germination rate (GR), germination percentage (GP), and mean germination time (MGT) were analyzed by exposing its seeds to 2450 MHz of microwave frequency for one, four, seven, and ten hours. It was revealed that exposing the seeds to the microwave frequency for 10 hours resulted in the highest GP. This treatment led to 100% of germination after three days with a mean germination time of 2.1 days. Although the other exposure times of microwave frequency caused the moderate effects on germination with aGPa3ranged from 93% to 98%, they failed to reduce theMGTa3. The results showed that ten-hour exposure times of microwave frequency for six days significantly facilitated and improved the germination indices (primary shoot and root length). Therefore, the technique is expected to benefit the improvement of rice seed germination considering its simplicity and efficacy in increasing the germination percentage and rate as well as the primary shoot and root length without causing any environmental toxicity.

scholarly journals Sugar apple (Annona squamosa L.) seed germination affected by the application of gibberellins

2016 ◽  
Vol 34 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Fabio Ernesto Martínez M. ◽  
Diego Miranda L. ◽  
Stanislav Magnitskiy
Keyword(s):  
Seed Germination ◽  
Gibberellic Acid ◽  
Positive Response ◽  
Germination Rate ◽  
Germination Percentage ◽  
Annona Squamosa ◽  
Germination Time ◽  
Mean Germination Time ◽  
Germinated Seeds

This research sought to establish the response of the germination percentage (PG), synchrony index (E), mean germination time (MGT) and mean germination rate (MGR) of Annona squamosa L. seeds from Apulo (province of Cundinamarca) and Castilla (province of Tolima), Colombia, to treatments with 0, 50, 100, 200, 400, 600, or 800 mg L-1 of gibberellic acid (GA). All of the treatments with GA increased the PG at each point of time of seed incubation. The 600 mg L-1 GA treatment resulted in higher PGs (92.3% at 16 days for Apulo and 95% at 24 days for Castilla) and lower MGTs (8.75 and 5.38 days for Apulo and Castilla, respectively) than those found with the concentration of 0 mg L-1 GA (17.68 and 10.88 days for Apulo and Castilla, respectively). Also, treating the seeds with 600 mg L-1 GA generated higher MGRs (0.18 and 0.12 germinated seeds/day for Castilla and Apulo, respectively) than those obtained with 0 mg L-1 GA (Castilla = 0.09 and Apulo = 0.06 germinated seeds/ day). Likewise, the germination was synchronized with the application of any concentration of GA. The results evidenced a positive response to the GA application, which provided a tool for the characterization of the phenomenon of dormancy in the A. squamosa seeds.

scholarly journals Effects of Seed Size on the Germination and Early Growth of African Baobab (Adansonia digitata L.)

2020 ◽  
pp. 1-7
Author(s):  
J. I. Amonum ◽  
F. Sumaduniya ◽  
T. O. Amusa
Keyword(s):  
Leaf Area ◽  
Seed Size ◽  
Germination Rate ◽  
Germination Percentage ◽  
Early Growth ◽  
Adansonia Digitata ◽  
Size Classes ◽  
Randomized Design ◽  
Significant Difference ◽  
Viable Seeds

The effects of seed size on the germination and early growth of A. digitata were assessed. Seeds were sourced locally within the University of Ilorin Campus. One hundred viable seeds were selected from each of the size classes. The seed weight, length, breadth, and width were measured for all the selected seeds. Mean weight, length, breadth, and thickness were: 0.62 g, 9.16 mm, 7.45 mm, and 5.85 mm, respectively for small seeds. 0.41 g, 9.54 mm, 7.68 mm, and 6.03 mm, respectively for medium seeds; and 0.44 g, 9.92 mm, 7.89 mm, and 6.21 mm, respectively for large seeds. The experiment was laid out in a completely randomized design (CRD). Seed dormancy was broken through the acid scarification method by soaking in H2SO4 at 70% concentration for 20 minutes with constant stirring. Variables of interest include: leaves number, seedlings height, collar diameter and leaf area. Based on the results of this finding, medium and large seeds germinated in 7 days after sowing while small seeds germinated in 10 days after sowing. Large seeds had the highest germination percentage (55%), followed by medium seeds with 27%. The small seeds were the least in terms of germination rate (21%). There was no significant difference in mean seedling heights, collar diameters and number of leaves among the seed size classes (P˃0.05). Mean leaf area significantly differed among the three size classes (P˂0.05). The result showed that large seeds gave best germination at a shorter period than the medium and small seed sizes. Thus, large seeds of A. digitata are recommended in propagation activities involving the species.

scholarly journals Comparison Study on the Effect of Nano and Bulk Titanium Dioxide Particles on Seeds Germination, Growth and Chemical Composition of Wheat Invitro and Invivo

2018 ◽  
Vol 28 (3) ◽  
pp. 85
Author(s):  
Raghad D. Alshybany
Keyword(s):  
Leaf Area ◽  
Germination Rate ◽  
In Vitro Study ◽  
Germination Percentage ◽  
Chemical Compositions ◽  
Root Tips ◽  
Area Index ◽  
Vigor Index

The present study aimed to examine the effect of TiO2 nanoparticles (NPs) compared with bulk particles (BPs) on seed germination and growth of latefyha's cultivar wheat in vitro and in vivo and on chemical compositions with detecting the residuum of NPs in the plant. In the in vitro study, most concentrations of NPs and BPs have no effect on germination percentage, mean germination time, mean daily germination, promoter indicator, number of leaves, length and number of root and root tips viability but they reduced germination rate and germination value besides they induced shoot length and biomass. In the in vivo study, some parameters induced by most concentrations of NPs such as plant leaves area, leaf area index, length, of viability roots, height and total of plant length and biomass while no effect was seen on: mean daily germination, vigor index I and vigor index II, chlorophyll B, leaf area relative, in this regard, it reduced germination percentage, chlorophyll A, and carotene. There were some differences between the effect of NPs and those of BPs. There were increased in the total number of chemical compounds that identified in leaves of wheat plants treated with nanoparticles compared with control while the total numbers of compounds were decreased using bulk particles.

scholarly journals Effects of Hydro and Hormonal Seed Priming on Seed Germination of Milk Thistle under Saline Stress Condition

2014 ◽  
Vol 6 (3) ◽  
pp. 374-380
Author(s):  
Yousef NASIRI ◽  
Parisa FEYZI ◽  
Abdollah JAVANMARD
Keyword(s):  
Salicylic Acid ◽  
Germination Rate ◽  
Seed Priming ◽  
Germination Percentage ◽  
Milk Thistle ◽  
Saline Stress ◽  
Nacl Salinity ◽  
Germination Time ◽  
Randomized Design ◽  
Mean Germination Time

Salinity is an abiotic stress which has harmful effects on germination of many plants. Therefore, high germination rate and vigorous early growth under salty soils is preferred. Seed priming is a way to increase salt tolerance of plants. An experiment was conducted to investigate the effect of seed priming on germination of milk thistle under salinity condition. The treatments were 4 levels of seed priming (no priming, distilled water as hydro priming and 0.5 and 1.0 mM salicylic acid) and 5 levels of salinity (0, 40 and 80 mM NaCl and 40 and 80 mM CaCl2). The experiment arranged as a factorial in a completely randomized design (CRD) with three replications. Results showed that salinity decreased germination percentage and germination rate to about 16 and 32% in 80 mM CaCl2 level compared to control, respectively. The highest mean germination time (5.7 day) were belonged to 80 mM CaCl2. Radicle and plumule length significantly decreased by 80 mM NaCl and 40 and 80 mM CaCl2. The lowest seedling weight and seed stamina observed in 80 mM CaCl2. 0.5 mM salicylic acid improved all traits except mean germination time as compared to control.  Salicylic acid (0.5 mM) improved radicle length under 0, 40 and 80 mM NaCl salinity levels as well as increased plumule length at the 0 and 40 mM NaCl salinity conditions.

scholarly journals Seed germination performance of nine Arabica coffee (Coffea arabica L.) varieties under the laboratory condition after six months of storage period.

2020 ◽  
Vol 36 (3) ◽  
pp. 203-211
Author(s):  
Ari Wibowo ◽  
Dwi Nugroho ◽  
Ucu Sumirat
Keyword(s):  
Seed Germination ◽  
Seed Quality ◽  
Average Length ◽  
Germination Rate ◽  
Storage Period ◽  
Germination Percentage ◽  
Arabica Coffee ◽  
Germination Time ◽  
High Germination ◽  
Intermediate Seeds

Coffee seeds are classified into intermediate seeds which require high moisture content during the storage and possess a short shelf life. Seed germination testing aims to determine the potential of a seed lot, evaluate seed quality during the storage and also to estimate the success of seedling in the nursery. This experiment aimed to determine the germination performance of several Arabica coffee varieties after being stored for six months at controlled temperature. Nine varieties of Arabica coffee, namely Abesinia-3, Andungsari-1, BLP, Gayo-2, Goiaba, Kartika-1, Kayumas, MP-3, and S-795 were used in this study. The seeds were harvested in the 2019 harvest season (September) and the germination was tested in April 2020. The germination test was carried out in laboratory by using petridish. The result showed that the tested Arabica coffee seeds still had a high germination percentage which was more than 85%. Only three varieties namely S-795, Abesinia-3, and Goiaba had low germination growth (<80%). Meanwhile, Kayumas, BLP, and Kartika-1 coffee varieties had the best germination growth with an average length of 34.19 mm; 39.79 mm and 39.41 mm, respectively. Kartika-1 variety needs 6–7 days to germinate; Kayumas, BLP, and Goiaba varieties took 7–8 days; S-795 and MP-3 took 10 days; as well as Andungsari-1, Abesinia-3, and Gayo-2 which took 10–12 days. Arabica coffee seeds that had a short germination time will had a high germination rate and otherwise. Each variety displayed a different germination performance. BLP, Kartika-1, Gayo-2 and MP-3 varieties had high potential germination, 86.67%; 89.17%; 86.67%, and 93.33%, respectively. Kayumas, BLP, and Kartika-1 varieties showed significantly longer germination, namely 34.19 mm; 39.79 mm and 39.41 mm, respectively. The fastest of average germination time was possessed by Kartika-1 variety (6.54 days) and the highest seed germination rate was also possessed by Kartika-1 variety (0.153 per day). 

scholarly journals Germination of Anatolian Black Pine (Pinus nigra subsp. pallasiana) Seeds from the Lakes Region of Turkey: Geographic Variation and Effect of Storage

2011 ◽  
Vol 39 (1) ◽  
pp. 267 ◽  
Author(s):  
Fatih TEMEL ◽  
Süleyman GÜLCÜ ◽  
Zafer ÖLMEZ ◽  
Aşkın GÖKTÜRK
Keyword(s):  
Germination Rate ◽  
Pinus Nigra ◽  
Germination Percentage ◽  
High Humidity ◽  
Black Pine ◽  
Seedling Production ◽  
Seed Sources ◽  
Germination Characteristics ◽  
Pine Trees ◽  
Anatolian Black Pine

Effects of 10-year storage on germination of seeds in 191 Anatolian Black Pine trees from 23 populations in the Lakes Region of Turkey were investigated. Germination tests were conducted with both fresh (in year 1999) and stored (in year 2009) seeds and variation in germination was related to geographic features of the populations. Significant reductions in germination rate (from 79.93% to 30.68%) and germination percentage (from 95.99% to 58.41%) were observed after 10-year storage. Germination characteristics seem to be associated with humidity of population locations. Seeds from more inland (i.e., continental) populations germinated slower but attained higher germination percentage for both seed sets. Germination percentage of stored seeds is highest at elevations with high humidity. Greater attention should be given to environmental conditions of seed sources in storing Anatolian Black Pine seeds in the Lakes Region of Turkey as it is a very important tool in ensuring continuous seedling production and genetic conservation.

Sign in / Sign up

Export Citation Format

Share Document