Perianth colour affects germination behaviour in wind-pollinated Salsola rubescens in Arabian deserts

Botany ◽  
2014 ◽  
Vol 92 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Ali A. El-Keblawy ◽  
Arvind Bhatt ◽  
Sanjay Gairola
Keyword(s):  
Salinity Tolerance ◽  
Germination Rate ◽  
Germination Percentage ◽  
Ecological Role ◽  
Light Requirement ◽  
Germination Speed ◽  
Germination Behaviour ◽  
Seeds Germination

Salsola rubescens Franch. is a wind-pollinated halophytic shrub that produces fruits with red and yellow winged perianths. Germinability of seeds from both fruit types was determined under various light, temperature, and salinity treatments. Red seeds, with and without winged perianths, were heavier than yellow seeds. Germination percentage and germination rate index (speed) were significantly affected by the perianth colour, presence of wings, and temperature and light of incubation and most of their interactions. Germination percentage was greater for yellow-winged seeds than for red-winged seeds. Wing removal significantly enhanced the germination percentage and germination speed in the two types. The presence of wings enhanced germination at lower temperatures, but wing absence enhanced germination at higher temperatures. Wing removal enhanced germination to a greater degree in yellow than in red seeds. There was no light requirement during germination of red-winged seeds, but yellow-winged seeds germinated significantly more in light than in darkness. Red-winged and dewinged seeds were more tolerant to salinity than yellow seeds. Removal of wings significantly increased salinity tolerance for seeds of both wing colours. It is concluded that the showy perianth colours have an ecological role in wind-pollinated plants in regulating dormancy and germination behaviour in the heterogeneous unpredictable hyperarid deserts.

scholarly journals Germination of palm seeds under periods of rehydration

2021 ◽  
Vol 27 (4) ◽  
pp. 446-452
Author(s):  
Kássia Barros Ferreira ◽  
Antonio Maricélio Borges de Souza ◽  
Ana Carolina Corrêa Muniz ◽  
Kathia Fernandes Lopes Pivetta
Keyword(s):  
Experimental Design ◽  
Germination Rate ◽  
Germination Percentage ◽  
Percentage Germination ◽  
Drying Process ◽  
Germination Speed ◽  
Favorable Conditions ◽  
Recalcitrant Species ◽  
Seeds Germination ◽  
Germinated Seeds

Abstract Palm seeds are indicative of being recalcitrant species. Seeds germination for many species, is slow and uneven, even in favorable conditions, often due to the resistance of the woody endocarp that makes them impermeable to water. Most species also have the characteristic of not tolerating the drying process at low moisture levels, thus losing their viability. In view of these considerations, the objective was to evaluate the effect of different periods of rehydration on the germinative process of seeds of royal palm, dwarf palm and jeriva. Seeds were homogenized and immersed in water containing 3 times their volume, with daily replacement. The experimental design used was completely randomized, with 5 treatments (0, 3, 6, 9, and 12 days of rehydration), with 4 replications of 25 seeds. The seeds were placed in transparent “gerbox” plastic boxes containing medium vermiculite as substrate and placed in BOD with a photoperiod of 16-hour of light and their respective optimum temperatures for each species. The number of germinated seeds was counted every 2 days until germination stabilized. The variables analyzed were germination percentage, germination speed index (GSI), average germination time (AGT) and distribution of germination over the days. Rehydration for 3 days increased the germination rate of royal palm seeds. For dwarf and jeriva species, rehydration did not influence the analyzed variables. The GSI and AGT were negatively influenced by the rehydration periods for royal palm. Rehydration prolonged the peak of germination of the studied species.

Salinity Tolerance of Black Gram Cultivars During Germination and Early Seedling Growth

2018 ◽  
Vol 51 (3) ◽  
pp. 51-68 ◽  
Author(s):  
M.K. Hasan ◽  
M.S. Islam ◽  
M.R. Islam ◽  
H.N. Ismaan ◽  
A. El Sabagh
Keyword(s):  
Salt Stress ◽  
Salinity Tolerance ◽  
Seedling Growth ◽  
Negative Impact ◽  
Germination Rate ◽  
Dry Weight ◽  
Germination Percentage ◽  
Shoot Length ◽  
Sand Culture ◽  
Black Gram

Abstract A laboratory experiment regarding germination and seedling growth test was conducted with three black gram genotypes tested under three salinity levels (0, 75 and 150 mM), for 10 days, in sand culture within small plastic pot, to investigate the germination and seedling growth characteristics. Different germination traits of all black gram genotypes, like germination percentage (GP), germination rate (GR), coefficient of velocity of germination (CVG) greatly reduced, as well as mean germination time (MGT) increased with increasing salt stress. At high salt stress, BARI Mash-3 provided the highest GP reduction (28.58%), while the lowest was recorded (15.79% to control) in BARI Mash-1. Salinity have the negative impact on shoot and root lengths, fresh and dry weights. The highest (50.32% to control) and lowest reduction (36.39%) of shoot length were recorded in BARI Mash-2 and BARI Mash-1, respectively, under 150 mM NaCl saline conditions. There were significant reduction of root lengths, root fresh and dry weight, shoot length, shoot fresh and dry weight in all genotypes under saline condition. The genotypes were arranged as BARI Mash-1 > BARI Mash-3 > BARI Mash-2, with respect to salinity tolerance.

Chitosan coating on bean and maize seeds: release of agrochemical fungicide and post-storage condition

2021 ◽  
Vol 43 ◽  
Author(s):  
Nancy Araceli Godínez-Garrido ◽  
Juan Gabriel Ramírez-Pimentel ◽  
Jorge Covarrubias-Prieto ◽  
Francisco Cervantes-Ortiz ◽  
Artemio Pérez-López ◽  
...  
Keyword(s):  
Seed Germination ◽  
Defense Mechanisms ◽  
Germination Rate ◽  
Storage Condition ◽  
Germination Percentage ◽  
Negative Effects ◽  
Retention Capacity ◽  
Chitosan Coating ◽  
Maize Seeds ◽  
Germination Speed

Abstract: Chitosan is a biopolymer obtained from deacetylation of chitin; it has multiple applications in agriculture as an antifungal, soil conditioner, inducer of defense mechanisms, fruits postharvest coating, leaves and seeds, among others. The objective in this research was to evaluate the effect of chitosan coatings mixed with fungicide (dithiocarbamate) on the germination and germination speed of bean and maize seeds in storage and to determine the retention capacity of the fungicide in the coated seeds under different times of imbibition. Two coating treatments at concentrations of 0.1 and 0.5% chitosan in water, two coatings treatments at 0.1 and 0.5% chitosan supplemented with 0.5% fungicide and a coating without chitosan using only 0.5% fungicide in water were used in bean and maize seed; and as control seeds imbibed in distilled water were used; after treatments, germination percentage and germination speed were determined, also fungicide release were determined at 0, 1, 2 and 6 h of imbibition, and the effect of storage time on germination and germination speed was determined at 30, 60, 90, 120, 150 and 180 days of storage at 4 °C and 45% relative humidity. The fungicide release effect was determined by inhibiting Fusarium oxysporum conidia germination. There were no negative effects of coatings on seed germination after storage. The treatment that provided both greater retention of the fungicidal agent and released it gradually, was 0.5% chitosan mixed with fungicide concentration. Chitosan coating seeds mixed with fungicide do not cause negative changes in seed germination or germination rate.

The Influence of Anions Additive/CeO2 on Cabbage

2014 ◽  
Vol 924 ◽  
pp. 354-358
Author(s):  
Di Zhang ◽  
Qing Shan Li ◽  
Bai Feng Li ◽  
Wei Hong ◽  
Lian Liu
Keyword(s):  
Protein Content ◽  
Germination Rate ◽  
Germination Percentage ◽  
Test Material ◽  
Protein Accumulation ◽  
Precise Content ◽  
Seeds Germination

In o rder to research the influence of anion additives/ CeO2 on cabbage seeds, taking cabbage seeds as the test material. This paper detected the seeds' germination percentage and protein content by respectively adding unique concentration of anion additives and CeO2 in soil. The results show that different anion additives have distinct influences on seed's growth in the same situation. To be more specific, 1040 can noticeably improve seeds' germination percentage and protein content. Moreover, different contents of 1040 could have various impacts on seeds' germination percentage and protein content. Furthermore, precise content of CeO2 can also significantly improve seeds' germination rate and protein accumulation.

scholarly journals Improving Germination Rate of Coastal Glehnia by Cold Stratification and Pericarp Removal

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 944
Author(s):  
Moon-Sun Yeom ◽  
Thi Kim Loan Nguyen ◽  
Ju-Sung Cho ◽  
Myung-Min Oh
Keyword(s):  
Mass Production ◽  
Germination Rate ◽  
Germination Percentage ◽  
Cold Stratification ◽  
Percentage Germination ◽  
Breaking Dormancy ◽  
Glehnia Littoralis ◽  
Germination Speed ◽  
Germinating Seeds ◽  
Inhibited Water

The medicinal plant, coastal glehnia (Glehnia littoralis F. Schmidt ex Miq.), belongs to the Apiaceae, which is known to exhibit morpho-physiological seed dormancy (MPD). In this study, we aimed to determine the dormancy type of this plant, along with the conditions for breaking dormancy, and how to increase its germination rate for mass production. Initially, the seeds of coastal glehnia had undeveloped embryos, which gradually developed following cold (5 °C) stratification over eight weeks. The embryo to seed (E:S) ratio increased to 66.7%, confirming that the seeds had the MPD type. Coastal glehnia seeds with pericarp did not show inhibited water uptake, and the germination inhibitory chemicals were not detected. However, removal of the pericarp improved the final germination percentage, germination speed, and T50 of coastal glehnia seeds compared with those of seeds with pericarp at 20 °C, which showed the highest value compared with other temperature treatments. Thus, cold stratification at 5 °C for eight weeks and removing the pericarp of germinating seeds maintained at 20 °C is efficient ways to break dormancy and improve the germination rate for the mass production of coastal glehnia.

scholarly journals (205) Germination of Echinacea Species Is Enhanced by ACC

HortScience ◽  
2006 ◽  
Vol 41 (4) ◽  
pp. 1069C-1069
Author(s):  
Laura A. Wood ◽  
Sharon Kester ◽  
Robert L. Geneve
Keyword(s):  
Seed Dormancy ◽  
North American ◽  
Germination Rate ◽  
Germination Percentage ◽  
Additional Work ◽  
Germination Speed ◽  
Viable Method

Echinacea are North American members of the Asteraceae, and all can show some degree of endogenous physiological seed dormancy that is alleviated by chilling stratification. In some species, ethephon has been shown to substitute for chilling stratification to relieve dormancy. The objective of this research was to investigate the effect of ACC on dormancy and germination in five Echinacea species. Germination for each species was 90%, 59%, 99%, 81%, and 21%, respectively. Germination on 5 mM ACC improved germination in E. tennesseensis, E. paradoxa, and E. simulata to 82%, 99%, and 82%, respectively, but there was no change for E. purpurea and E. angustifolia. Germination rate was dramatically accelerated in all species in the presence of ACC. On average, there were 57% more seeds germinated on ACC after 3 days compared to untreated seeds. Exposing E. purpurea and E. tennesseensis seeds to 1 or 2 days of 5 mM ACC before drying and subsequently re-hydrating the seeds did not have the same effect as continual exposure to ACC. Similarly, there was no clear enhancement of adding ACC during stratification over the improvement gained by chilling stratification alone. Seeds produced more ethylene upon germination following both stratification and ACC treatment. However, significantly more ethylene is produced during germination in ACC-treated seeds. It was clear that ACC-treated seeds showed improvement for enhanced germination speed and in some cases germination percentage. Unfortunately, this enhanced germination was not retained in seeds treated with ACC and dried prior to germination. Additional work is required to develop a commercially viable method of loading ACC into seeds for germination enhancement.

Problems with using mean germination time to calculate rate of seed germination

2015 ◽  
Vol 63 (8) ◽  
pp. 631 ◽  
Author(s):  
Elias Soltani ◽  
Farshid Ghaderi-Far ◽  
Carol C. Baskin ◽  
Jerry M. Baskin
Keyword(s):  
Germination Rate ◽  
Germination Percentage ◽  
The Other ◽  
Seed Vigour ◽  
Or Groups ◽  
Germination Speed ◽  
Mean Germination Time ◽  
Treatment Comparisons ◽  
Time Spread ◽  
Mean Time

Seed scientists and other plant biologists are interested in the measurement of germination because seeds from different individuals, populations, seed lots and treatments can differ in germination percentages, rate (speed) and uniformity. Mean time to germination (MGT) is a measure of the rate and time-spread of germination; however, there is a problem with using this method to calculate germination rate. MGT does not show the time from the start of imbibition to a specific germination percentage. MGT has been used to compare specific pairs or groups of means and to evaluate seed vigour. However, it is not the real time to mean germination but just an index of germination speed. Using MGT is not correct for ANOVA, post-ANOVA or the other comparison tests, because it does not show time to a specific germination percentage. Thus, we recommend that t50 be used instead of MGT. The t50 has all benefits of MGT, but it does not have the problems of MGT in treatment comparisons.

scholarly journals Biometric description of fruits and seeds, germination and imbibition pattern of desert rose [Adenium obesum (Forssk.), Roem. & Schult.]

2015 ◽  
Vol 37 (4) ◽  
pp. 206-213 ◽  
Author(s):  
Ronan Carlos Colombo ◽  
Vanessa Favetta ◽  
Lilian Yukari Yamamoto ◽  
Guilherme Augusto Cito Alves ◽  
Julia Abati ◽  
...  
Keyword(s):  
Water Absorption ◽  
Internal Structure ◽  
Germination Percentage ◽  
Absorption Curve ◽  
Germination Test ◽  
Germination Process ◽  
Germination Speed ◽  
Triphasic Pattern ◽  
Number Of Seeds ◽  
Seeds Germination

This study has aimed to carry out the description of fruits and seeds and germination process of desert rose, from two years of observations. The fruits and seeds were characterized based on length, diameter and number of seeds per fruit. The seeds internal structure and germinating process were also described. Germination test was performed at 25 and 30 °C temperatures, determining the germination percentage and germination speed index. Seeds harvested in 2013 were stored for 12 months and submitted to a new germination test. Parallel to these tests, the seeds imbibition curve was determined in substrates over and between sheets of paper at 15, 20, 25 and 30 °C temperatures. The fruits and seeds had similar lengths and diameters in both years of observations. The seeds can be stored for up to 12 months without loss in viability and temperatures of 25 and 30 °C are suitable for performing the germination test of this species. The water absorption curve of desert rose seeds follows a triphasic pattern of soaking.

scholarly journals Effect of light and temperature on germination of Costus arabicus L., seeds an tropical ornamental species

2016 ◽  
Vol 22 (3) ◽  
pp. 259
Author(s):  
Armando Reis Tavares ◽  
Nara Oshiro Santos ◽  
Shoey Kanashiro ◽  
Vanessa Rebouças do Santos
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Germination Percentage ◽  
Stem Cutting ◽  
Tropical Species ◽  
Temperature Conditions ◽  
Germination Speed ◽  
Ornamental Species ◽  
Effect Of Light

Costus arabicus L. (Costaceae) is a tropical species native from Brazil. The species has ornamental potential as garden and vase plant, and for flower and stem cutting. The aim of this study was to evaluate the seed germination of C. arabicus under different of light and temperature conditions. Seeds subjected to constant temperatures of 20, 25 and 30 °C under photoperiod of 12 h of light or dark. The parameters analyzed were percentage of germination and germination speed index (GSI). The highest germination percentage (70%) was under temperature of 30 °C, both in light or dark. The GSI showed that the germination rate increases as temperature increases, mainly on 30 °C. C. arabicus seeds germinated in the presence or absence of light, thus was considered neutral photoblastic and germination on light under 30 °C was more efficient for seed germination.

scholarly journals Osmopriming duration in Araçá-boi seeds germination

2016 ◽  
Vol 10 (1) ◽  
pp. 17
Author(s):  
Marcela Liege Da Silva ◽  
Edvan Alves Chagas ◽  
Elias Ariel de Moura ◽  
Pollyana Cardoso Chagas ◽  
Oscar José Smiderle ◽  
...  
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Potassium Nitrate ◽  
Germination Percentage ◽  
Amazon Region ◽  
Factorial Analysis ◽  
Average Efficiency ◽  
Industrial Use ◽  
Seeds Germination

The Araca-boi is a native fruit of the Amazon region and its fruits have great potential for agro-industrial use due to the intrinsic characteristics of the pulp. The seeds are dormant and the primary cause could be due to the presence of inhibiting chemicals germination and can also be caused by the impermeability in tegument. The objective of this study was to assess the osmopriming efficiency promoted by Sucrose (C12H22O11) and Potassium Nitrate (KNO3 ) on germination of seeds of araca-boi in different immersion times. Thus, the seeds were osmoconditioned in following solutions: C12H22O11, KNO3 , KNO3 + C12H22O11 and H2 O, by period of 6, 12 and 24 h. Throughout of 70 days were evaluated the germination percentage and germination rate (index). The experiment is based on a completely randomized in a factorial analysis 4x3 with four replications of 10 seeds. The osmopriming of Araca-boi seed in KNO3 solution was shown to be efficient both to promote germination and the germination rate. The Araca-boi seeds osmoconditioned in KNO3 solution has an average efficiency of 99% in the germination percentage up to 70 days. The osmopriming period showed no influence on seed germination of the seeds of Araca-boi.

Sign in / Sign up

Export Citation Format

Share Document