Effect of water stress on germination of beechnuts treated before and after storage

2004 ◽  
Vol 34 (6) ◽  
pp. 1204-1209 ◽  
Author(s):  
Elisabetta Falleri ◽  
Claudine Muller ◽  
Elyane Laroppe
Keyword(s):  
Water Stress ◽  
Water Deficit ◽  
Marked Effect ◽  
Germination Percentage ◽  
Limiting Factor ◽  
Germination Test ◽  
Germination Process ◽  
Before And After ◽  
Osmotic Potentials ◽  
Moderate Stress

Beechnuts from two seedlots were pretreated, without medium, at a controlled moisture content (MC) of 30% before or after 1-year storage at –7 °C. Seeds treated with the two methods were germinated on substrates at decreasing osmotic potential down to –1.2 MPa. A moderate stress of –0.2 MPa caused a slight but significant decrease in germination percentage. Each further increment in water stress produced additional significant decreases in germination capacity. At –1.2 MPa, germination was almost prevented. Seeds pretreated before storage showed lower germination percentage and speed at all osmotic potentials, but this result was due to a marked effect of seed initial MC, rather than a lower resistance to water deficit. In fact, MC of beechnuts pretreated before storage was 8%, whereas beechnuts pretreated after storage started germination tests under water stress with an initial MC of 30%. Moreover, seeds at lower initial MC need more time to imbibe before the germination process can start. Seeds with higher initial MC were probably able to cope better with water deficit, at least during the 30-day germination test in the laboratory. A second experiment carried out on beechnuts treated only before storage but made to have different initial MC seemed to confirm this conclusion. Ungerminated seeds were not damaged, as revealed by a tetrazolium test performed at the end of each germination test. Advantages in nursery practice shown by dry, nondormant beechnuts (pretreated before storage) are discussed in relation to the possibility of sowing when water availability in the soil is not a limiting factor.

scholarly journals Mobilization of reserves and germination of seeds of Erythrina velutina Willd. (Leguminosae - Papilionoideae) under different osmotic potentials

2012 ◽  
Vol 34 (4) ◽  
pp. 580-588 ◽  
Author(s):  
Renata Conduru Ribeiro Reis ◽  
Bárbara França Dantas ◽  
Claudinéia Regina Pelacani
Keyword(s):  
Water Stress ◽  
Seed Germination ◽  
Osmotic Potential ◽  
Soluble Sugars ◽  
Germination Percentage ◽  
Uniformity Coefficient ◽  
Carbon And Nitrogen ◽  
Germination Process ◽  
Mean Time ◽  
Osmotic Potentials

Some environmental factors, including water availability, may influence seed germination. This study investigated the germination of E. velutina seeds submitted to different osmotic potentials and mobilization of reserves during water-stress. Scarified seeds were arranged in paper rolls and soaked in solutions of Polyethylene Glycol (PEG) prepared in osmotic potentials 0.0, -0.2, -0.4, -0.6, and -0.8 MPa and kept into a seed germinator, at 25 °C, and 12/12 h photoperiod (L/D), during 10 days. The percentage, mean time, mean speed, germination speed index; as well as the germination uniformity coefficient were assessed. During germination process the total soluble sugars, reducing sugars, soluble protein, and total amino acids were quantified in the cotyledon, hypocotyl and radicle of soaked seeds and cotyledons of quiescent seeds (control). There was influence of osmotic potential on E. velutina seed germination. The germination percentage remained at high levels until -0.6 MPa and above this osmotic potential there has been no germination. The mobilization of stored reserves of carbon and nitrogen in E. velutina seeds was also influenced by water-stress. There was sensitiveness between -0.2 and -0.6 MPa; however, the degradation and the mobilization of reserves was slower when the osmotic potential decreased.

scholarly journals Water deficit on germination and vigour in seeds of the Jambu

2019 ◽  
Vol 35 (4) ◽  
Author(s):  
Erivanessa Costa Sousa Sarmento ◽  
Fernando Sarmento De Oliveira ◽  
Brenna Rafaella Verissímo Dos Santos ◽  
Salvador Barros Torres ◽  
Clarisse Pereira Benedito ◽  
...  
Keyword(s):  
Water Deficit ◽  
Water Availability ◽  
Seedling Emergence ◽  
Oxygen Demand ◽  
Dry Weight ◽  
Distilled Water ◽  
Germination Test ◽  
Germination Process ◽  
Seedling Length ◽  
Osmotic Potentials

Water availability influences plant metabolism during the various stages of development, especially in the period between germination and seedling emergence. The aim of this study was to evaluate the effect of water deficit during the germination process on seeds of A. oleracea. The experiment was carried out in a completely randomised design, with four replications of 50 seeds. The treatments were arranged in a 5 x 2 factorial scheme, with the first factor consisting of the osmotic potentials (-0.2, -0.4, -0.6, -0.8 and distilled water for the potential 0.0 MPa) and the second factor consisting of two lots of seed. The germination test was carried out on substrates moistened with solutions of mannitol and polyethylene glycol (PEG 6000) at the various potentials, in a Biochemical Oxygen Demand (BOD) germinator at a temperature of 30°C and under constant light. The test was evaluated daily for 14 days, considering the seeds that had a root length equal to or greater than two millimetres as having germinated. The variables under analysis were germination, germination speed index, seedling length and seedling dry weight. The germination process of A. oleracea is compromised at water potentials of -0.2 MPa and -0.4 MPa when submitted to PEG and mannitol respectively. Seeds from Lot 1 were more tolerant to the water deficit than were those from Lot 2.

scholarly journals ‘Jurema-de-embira’ seed germination under water stress and at different temperatures

2017 ◽  
Vol 21 (4) ◽  
pp. 244-248 ◽  
Author(s):  
Narjara W. Nogueira ◽  
Salvador B. Torres ◽  
Rômulo M. O. de Freitas ◽  
Thiago H. da S. Castro ◽  
Francisco V. da S. Sá
Keyword(s):  
Water Stress ◽  
Germination Percentage ◽  
Water Retention Capacity ◽  
Total Biomass ◽  
Retention Capacity ◽  
Water Imbibition ◽  
Germination Process ◽  
Dry Biomass ◽  
Different Temperatures ◽  
Osmotic Potentials

ABSTRACT The process of water imbibition by the seed depends on temperature and water availability, which according to the absorbed water retention capacity will determine the success of the germination process. Thus, this study aimed to investigate the effects of water stress on the germination and vigor of ‘jurema-de-embira’ seeds under different temperatures. The experimental design was completely randomized in a 7 x 4 factorial scheme (osmotic potential and temperature) with four replicates of 25 seeds each. The osmotic potentials of 0, -0.1, -0.2, -0.3, -0.4, -0.5 and -0.6 MPa at temperatures of 25, 30 and 35 °C and alternated of 20-30 °C, under photoperiod of 8 h, were evaluated. Germination percentage, germination speed index, shoot and root length, shoot dry biomass, root dry biomass and total biomass were evaluated. Water stress negatively affected the germination and vigor of ‘jurema-de-embira’ seedlings from the potential of -0.2 MPa on, whose effects are more evident at the temperature of 35 ° C. The alternated temperature of 20-30 °C allowed greater tolerance to water stress for the germination of ‘jurema-de-embira’ seeds.

scholarly journals Hydrotime model to evaluate the effects of a set of priming agents on seed germination of two leek cultivars under water stress

2021 ◽  
Author(s):  
Alessandro Romano ◽  
Romana Bravi
Keyword(s):  
Water Stress ◽  
Water Deficit ◽  
Germination Rate ◽  
Intraspecific Variability ◽  
Germination Percentage ◽  
Allium Ampeloprasum ◽  
Cultivated Species ◽  
Hydrotime Model ◽  
Base Water Potential ◽  
Peg 8000

Water deficit is one of the main constraints of germination for many cultivated species. Among the techniques used to promote germination, seeds priming has been found to play a key role. In the present study, a set of different priming agents (KCl, KH2PO4, CaCl2 and PEG 8000) was tested on seeds of two leek (Allium ampeloprasum L.) cultivars (“Lungo della riviera” and “Monstrueux de Carentan”) to assess the effects on germination performances both in optimal hydration condition (Ψw = 0 MPa) and under water deficit (−0.3 and −0.6 MPa). Germination percentage of “Lungo della riviera” was improved by PEG and KCl at −0.3 MPa and −0.6 MPa, respectively, whereas CaCl2 improved germination of “Monstrueux de Carentan” at −0.6 MPa. Osmopriming was beneficial in terms of germination rate although to different extent depending on genotype and priming agent. The hydrotime model showed that the effects of priming on germination rate was mostly due to a lowering of the predicted hydrotime constant (θH), whereas median base water potential Ψb(50) tended to increase following treatments albeit with some exception. In this study, hydrotime model proved to be a useful tool to test the effectiveness of different priming treatments on leek seeds and the intraspecific variability in germination capability and speed under water stress.

scholarly journals Optimum Sample Size in the Germination of Atemoya Seeds (Annona× atemoya Mabb.)

2019 ◽  
Vol 11 (7) ◽  
pp. 239 ◽  
Author(s):  
Rafaela Lanças Gomes ◽  
José Raimundo de Souza Passos ◽  
Juliana Iassia Gimenez ◽  
Marília Caixeta Sousa ◽  
Mariana de Fatima De-Pieri-Oliveira ◽  
...  
Keyword(s):  
Sample Size ◽  
Germination Percentage ◽  
Point Of View ◽  
Sampling Unit ◽  
Germination Test ◽  
Optimum Sample Size ◽  
Contour Lines ◽  
Germination Process ◽  
Germination Speed ◽  
Number Of Seeds

Atemoya currently has its seeds studied in several aspects, from the technological and physiological point of view. However, for the performance of the germination test, there is no standardization in relation to the number of seeds and replicates. Thus, this work aims to determine the optimal sample size for germination tests with atemoya seeds. A germination test was carried out with 5 treatments, considering 10, 20, 30 40 and 50 seeds per sampling unit with 50 replicates of each. Data were analyzed using logistic regression, non-linear Gompertz regression models, bootstrap simulation and graphs in the form of contour lines in order to be able to infer the best binomial of the number of seeds per sampling unit and the number of replicates. The expected germination percentage, maximum germination speed and times for the beginning of the germination process, maximum germination speed and interruption of the germination process were determined. The treatment of 20 seeds per sampling unit statistically differs from that of 40 seeds by the Tukey-Kramer test with 5% significance. It could be concluded that for germination tests with atemoya seeds to have statistical validity, the smallest sample size is 10 seeds per unit, regardless of number of replicates.

scholarly journals Water: the most important ‘molecular’ component of water stress tolerance research

2013 ◽  
Vol 40 (12) ◽  
pp. 1310 ◽  
Author(s):  
Vincent Vadez ◽  
Jana Kholova ◽  
Mainassara Zaman-Allah ◽  
Nouhoun Belko
Keyword(s):  
Water Stress ◽  
Water Supply ◽  
Water Deficit ◽  
Plant Traits ◽  
Supply And Demand ◽  
Limiting Factor ◽  
Management Options ◽  
Major Drawback ◽  
Water Stress Tolerance ◽  
Water Supply And Demand

Water deficit is the main yield-limiting factor across the Asian and African semiarid tropics and a basic consideration when developing crop cultivars for water-limited conditions is to ensure that crop water demand matches season water supply. Conventional breeding has contributed to the development of varieties that are better adapted to water stress, such as early maturing cultivars that match water supply and demand and then escape terminal water stress. However, an optimisation of this match is possible. Also, further progress in breeding varieties that cope with water stress is hampered by the typically large genotype × environment interactions in most field studies. Therefore, a more comprehensive approach is required to revitalise the development of materials that are adapted to water stress. In the past two decades, transgenic and candidate gene approaches have been proposed for improving crop productivity under water stress, but have had limited real success. The major drawback of these approaches has been their failure to consider realistic water limitations and their link to yield when designing biotechnological experiments. Although the genes are many, the plant traits contributing to crop adaptation to water limitation are few and revolve around the critical need to match water supply and demand. We focus here on the genetic aspects of this, although we acknowledge that crop management options also have a role to play. These traits are related in part to increased, better or more conservative uses of soil water. However, the traits themselves are highly dynamic during crop development: they interact with each other and with the environment. Hence, success in breeding cultivars that are more resilient under water stress requires an understanding of plant traits affecting yield under water deficit as well as an understanding of their mutual and environmental interactions. Given that the phenotypic evaluation of germplasm/breeding material is limited by the number of locations and years of testing, crop simulation modelling then becomes a powerful tool for navigating the complexity of biological systems, for predicting the effects on yield and for determining the probability of success of specific traits or trait combinations across water stress scenarios.

scholarly journals SUSCEPTIBILITY OF STRAWBERRY CULTIVARS TO DROUGHT CONDITIONS

2020 ◽  
Vol 8 (12) ◽  
pp. 171-178
Author(s):  
Abdullaev Ravshan Mavlyanovich ◽  
◽  
Abdullaeva Khilola Ravshanovna ◽  
Keyword(s):  
Soil Moisture ◽  
Water Stress ◽  
Relative Humidity ◽  
Water Content ◽  
Limiting Factor ◽  
Ecological Groups ◽  
Water Deficiency ◽  
Drought Conditions ◽  
Before And After ◽  
Strawberry Cultivars

The article reveals the data on the drought tolerance of strawberry cultivars, studied the water content and water stress in the leaves of strawberry cultivars belonging to different ecological groups. Currently, water deficiency and the amount of water available for irrigation are a limiting factor in expanding the area under crops and increasing productivity. In the experiments, the air temperature, relative humidity, water content in the leaves and the effect of soil moisture on water scarcity and the correlation between them were studied by taking samples from the leaves of strawberry cultivars before and after irrigation of the experimental fields.

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 Analysis of Agroecology and The Requirement of Supplemental Irrigation on Cacao Plants in Lampung

2017 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Bariot Hafif
Keyword(s):  
Water Stress ◽  
Water Deficit ◽  
Secondary Data ◽  
Survey Method ◽  
Limiting Factor ◽  
Western Region ◽  
Eastern Region ◽  
Suitability Analysis ◽  
Literature Study ◽  
Supplemental Irrigation

<p><em>One of the factors that affect the productivity of cacao plants is water availability. Water deficit will negatively affect the development of cacao flowers and beans. Water stress is reported as one of the causes of low productivity on plantation crops in Lampung Province. The study was aimed to analyze the characteristics of agroecology and supplemental irrigation required for growth and production of cacao in Lampung. The research was carried out in the District of Pesawaran, Tanggamus, East Lampung, and South Lampung, Lampung Province, from 2012 to 2015. The study was conducted with the survey method and literature study for the collection of the primary and secondary data, related to the characteristics of the land agroecology. Geographically, the main cacao growing areas in this region is divided into two regions, western region consist of Pesawaran and Tanggamus District and east region comprise of East Lampung and South Lampung District. Based on agroecological zones, the planting of cacao in both regions is in accordance with the recommendations of land use. However, land suitability analysis showed that some of the agroecological characteristics of land becomes a limiting factor for the growth and production of cacao, including soil pH &lt; 5.5, low cations exchange capacity (CEC) (&lt; 16 cmol(+)/kg), air humidity &gt; 75%, and in some areas there is an erosion hazard. Another obstacle is the water deficit that occurs during 140 days within 1 year of cacao growth cycle that occurred in July until mid-November. There are two factors that can be applied  to increase cacao productivity in Lampung province, i.e. (1)  an improvement of cacao cultivation technology that can address the characteristics of agroecology as a limiting factor of growth, and (2) an application of a supplemental irrigation technology to avoid cacao from water stress. The requirement of supplemental irrigation is 340.5 mm in western region and 209.7 mm in eastern region of Lampung.</em></p>

scholarly journals Germination of cotton cultivar seeds under water stress induced by polyethyleneglycol-6000

2011 ◽  
Vol 68 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Carlos Henrique Salvino Gadelha Meneses ◽  
Riselane de Lucena Alcântara Bruno ◽  
Pedro Dantas Fernandes ◽  
Walter Esfrain Pereira ◽  
Leonardo Henrique Guedes de Morais Lima ◽  
...  
Keyword(s):  
Water Stress ◽  
Seed Viability ◽  
Accelerated Aging ◽  
Germination Percentage ◽  
Randomized Design ◽  
Physiological Quality ◽  
Differential Viability ◽  
Osmotic Potentials ◽  
Cotton Cultivar

The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the least sensitive to the tested osmotic potentials, both in terms of germination and of vigor. The 'BRS-201' cultivar was mostly affected by the viability and vigor tests under water deficit conditions. Differential viability and vigor between cultivars were observed under the water stress levels.

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