scholarly journals Studies on the Environmental Factors Affecting the Seed Germination and Seedling Growth of Several Pasture Species : 2. Effect of soil moisture on the seed germination of some grasses and legumes

1959 ◽  
Vol 28 (1) ◽  
pp. 92-93
Author(s):  
Masao HOSHINO ◽  
Jugo IKEDA ◽  
Fumie MATSUMOTO
Keyword(s):  
Soil Moisture ◽  
Seed Germination ◽  
Environmental Factors ◽  
Seedling Growth ◽  
Factors Affecting

scholarly journals Factors Affecting Seed Dormancy and Germination of Greater Bur-Parsley (Turgenia latifolia)

2018 ◽  
Vol 36 ◽  
Author(s):  
M. REZVANI ◽  
S.A. SADATIAN ◽  
H. NIKKHAHKOUCHAKSARAEI
Keyword(s):  
Seed Germination ◽  
Environmental Factors ◽  
Seed Dormancy ◽  
Seedling Emergence ◽  
Potassium Nitrate ◽  
Germination Percentage ◽  
Dormancy Breaking ◽  
Planting Depth ◽  
Factors Affecting ◽  
Drought And Salt Stresses

ABSTRACT: Our knowledge about seed dormancy breaking and environmental factors affecting seed germination of greater bur-parsley (Turgenia latifolia) is restricted. This study has addressed some seed dormancy breaking techniques, including different concentrations of gibberellic acid (GA3) and potassium nitrate (KNO3), leaching duration, physical scarification as well as some environmental factors effective on seed germination such as salt and drought stresses, pH and seed planting depth. Seed germination was promoted with lower concentrations of KNO3 (0.01 to 0.02 g L-1), while higher concentrations reduced germination percentage. Seed dormancy was declined by low concentrations of GA3 up to 100 ppm. Seeds of greater bur-parsley germinated in a range of pH from 3 to 7. With enhancement of drought and salt stresses, seed germination decreased. Also, there was no seed germination in a high level of stresses. Seedling emergence reduced as planting depth increased. Use of GA3, KNO3, leaching and physical scarification had a positive effect on seed dormancy breaking of greater bur-parsley. The information from the study increases our knowledge about seed dormancy breaking techniques, response of germination to drought and salt stresses and also determination of distribution regions of greater bur-parsley in the future.

The Factors Affecting the Stem Water Potential of Tamarix ramosissima Lbd. in the Extremely Arid Regions

2013 ◽  
Vol 800 ◽  
pp. 143-148 ◽  
Author(s):  
Ai Hong Fu ◽  
Wei Hong Li ◽  
Ya Ning Chen
Keyword(s):  
Soil Moisture ◽  
Environmental Factors ◽  
Water Potential ◽  
Arid Regions ◽  
Normal Growth ◽  
Tamarix Ramosissima ◽  
Tarim River ◽  
Stem Water Potential ◽  
Factors Affecting ◽  
Stem Water

Using Tamarix ramosissima Lbd. growing in the extremely arid regions along the lower reaches of Tarim River, Xinjiang, we preformed a series of investigations on the effects of weather, soil moisture and salt on the stem water potential (ψs) of T. ramosissima. We identified the leading environmental factors affecting ψs of T. ramosissima and detected the thresholds of the environmental factors. First, the soil moisture was the most important factor affecting ψs of T. ramosissima among all the environmental factors. While there was no minimum threshold of the soil moisture for T. ramosissima to absorb moisture from soil, the highest threshold of the soil moisture was 36%. When the soil moisture was higher than 36%, there was a significant change on ψs of T. ramosissima. Our study provides crucial empirical data for keeping the normal growth of T. ramosissima.

Comparative adaptation of seed germination and seedling growth to environmental factors in two Picea plant species

2019 ◽  
Vol 39 (2) ◽  
Author(s):  
刘有军 LIU Youjun ◽  
刘世增 LIU Shizeng ◽  
康才周 KANG Caizhou ◽  
满多清 MAN Duoqing
Keyword(s):  
Seed Germination ◽  
Environmental Factors ◽  
Plant Species ◽  
Seedling Growth

scholarly journals Environmental factors affecting the success of exotic plant invasion in a wildland-urban ecotone in temperate South America

2019 ◽  
Vol 14 (2) ◽  
pp. 257-274
Author(s):  
Romina Paola Nievas ◽  
Mirian Roxana Calderon ◽  
Marta Matilde Moglia
Keyword(s):  
Soil Moisture ◽  
Environmental Factors ◽  
Environmental Variables ◽  
Anthropogenic Disturbance ◽  
Plant Invasion ◽  
Exotic Plants ◽  
Scaling Analysis ◽  
Exotic Plant ◽  
Factors Affecting ◽  
Exotic Plant Invasion

Urbanization is one of the main causes driving changes in biodiversity patterns and it is regarded as a major threat to native biota. Successful exotic plant invasion depends on invasiveness and invasibility. Invasiveness is related to the characteristics of exotic plants and invasibility to the features of the sites. The objective of this study was to identify the invasibility environmental factors affecting the success of exotic plant invasion in a wildland-urban ecotone of the central region of Argentina (Potrero de los Funes Village, San Luis). Fifty phytosociological inventories were recorded in an area of 700 ha during spring and summer seasons (2013–2015). Abundance-coverage values of plants and environmental variables such as soil characteristics, anthropogenic disturbance, and altitude of the sites were assessed. Soil moisture, electrical conductivity (EC), acidity (pH), organic matter content, and nitrates were determined as part of the soil analysis. A Nonmetric Multidimensional Scaling analysis was used to identify the possible relationship between abundance-coverage of the vegetation and environmental variables. Abundance-coverage of exotic plants was positively influenced by anthropogenic disturbance and nitrate levels, and negatively affected by altitude. However, no significant correlation was found between percentage of exotic plants and pH, EC, or soil moisture. Thus, urbanization and touristic activities influenced the success of exotic plant invasion.

scholarly journals ENVIRONMENTAL FACTORS AFFECTING SEED GERMINATION OF COMMON TEASEL (Dipsacus fullonum)

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
J.F.F. DADDARIO ◽  
D.J. BENTIVEGNA ◽  
G. TUCAT ◽  
O.A. FERNÁNDEZ
Keyword(s):  
Salt Stress ◽  
Seed Germination ◽  
Environmental Factors ◽  
Osmotic Stress ◽  
Management Strategies ◽  
Buenos Aires Province ◽  
Factors Affecting ◽  
Dry Storage ◽  
Native Grasslands ◽  
Germination Parameters

ABSTRACT Common teasel is a widespread, invasive species that has been introduced in Buenos Aires province, Argentina, where it alters the species composition of protected areas and native grasslands. A better understanding of seed germination behavior is essential for predicting its invasion potential in new areas and would be useful for developing effective management strategies. This research, conducted under laboratory conditions, evaluated the influence of several environmental factors such as pH, constant temperature, osmotic stress, salt stress and dry storage, on germination and rate of germination of common teasel seed. Between-year variation in germination responses was also examined. Seed germination was not affected by different pH levels. Although common teasel seeds germinated over a range of temperatures from 6 to 36 oC, the optimum temperature was 22 oC. Common teasel seed germination showed moderate tolerance to osmotic stress and a relatively high tolerance to salt stress. No seed germination was observed at - 1 MPa and 640 mM of osmotic potential and salt concentration, respectively. Seed germination remained high (> 90%) after all the dry storage treatments. Besides, the response of seeds to germination parameters showed between-year variation. It was shown that common teasel is able to germinate over a broad range of environmental conditions. This capacity would explain, at least partially, why this species is so widely distributed and its great potential to invade new areas.

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