scholarly journals Studies on the Environmental Factors Affecting the Seed Germination and Seedling Growth of Several Pasture Species : 1. Effect of light intensity on the growth of seedlings of some grasses and legumes

1958 ◽  
Vol 27 (1) ◽  
pp. 111-114 ◽  
Author(s):  
Masao HOSHINO ◽  
Naosuku MORIYA ◽  
Jugo IKEDA ◽  
Fumie MATSUMOTO
Keyword(s):  
Seed Germination ◽  
Environmental Factors ◽  
Light Intensity ◽  
Seedling Growth ◽  
Factors Affecting ◽  
Growth Of Seedlings ◽  
Effect Of Light

scholarly journals Caracterización ficológica en manantiales de la cuenca baja del sistema hidrológico del Pánuco, México

2017 ◽  
pp. 21 ◽  
Author(s):  
Javier Carmona-Jiménez ◽  
Gustavo Montejano-Zurita
Keyword(s):  
Environmental Factors ◽  
Light Intensity ◽  
Current Velocity ◽  
Growth Forms ◽  
Factors Affecting ◽  
Similarities And Differences ◽  
The Relationship

The results of a phycofloristic study on three springs in the Huasteca Potosina region are presented; 67 species are reported. Floristic similarities and differences among the springsare analized, as well as the relationship between species and environmental factors. Microhabitas were defined in the springs as well as the principal algal asociations that characterize them. Light intensity and current velocity are the most important factors affecting the predominant growth forms present in this type of habitat.

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.

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 Intraspecific variation in seed size and light intensity affect seed germination and initial seedling growth of a tropical shrub

2017 ◽  
Vol 31 (4) ◽  
pp. 736-741 ◽  
Author(s):  
Aniele C. R. Veloso ◽  
Priscila S. Silva ◽  
Wallison K. Siqueira ◽  
Karen L.R. Duarte ◽  
Ingrid L. V. Gomes ◽  
...  
Keyword(s):  
Seed Germination ◽  
Light Intensity ◽  
Intraspecific Variation ◽  
Seed Size ◽  
Seedling Growth

scholarly journals Elucidation of seed dormancy and phytohormones by germination after exogenous foliage whey application

1970 ◽  
pp. 08-14
Author(s):  
Jadhav Rajesh K, Pranay Mulam, Khot Vidhesh
Keyword(s):  
Seed Germination ◽  
Seed Dormancy ◽  
Seedling Growth ◽  
Rapid Growth ◽  
Germination Rate ◽  
Exogenous Application ◽  
Paper Towel ◽  
Leguminous Seeds ◽  
Growth Of Seedlings ◽  
Leaf Juice

A study was conducted with an aim of achieving 100% seed germination and to evaluate the rate of dormancy upon exogenous application of the deproteinised leaf juice (DPJ) in various leguminous and non leguminous seeds. DPJ if inducing retardation of dormancy, the activity of enzyme was analysed to prove the presence of phytohormones. DPJ from the three non leguminous foliages of brinjal, radddish and dasheen were prepared by green crop fractionation. The seed germination results obtained by the paper towel method and the activity of enzyme protease in DPJ of radish and Colocasia leaves separately. There was variation in germination rate by different DPJ influence. Some seeds showed fast germination while some germinated late. Few seeds were not germinated by control. In some seeds, DPJ decreased the rate of germination while on the contrary there was rapid growth of seedlings by the potentiality of DPJ. DPJ found mutagenic by its influencing inhibitory expression in seedling growth in some cases. The enzyme protease released by phytohormone gibberellin during the seed germination. Positive glyoxlic test indicated presence of auxins in whey.

Factors affecting growith and distribution of kauri (Agathis australis Salisb.) I. Effect of light on the establishment of Kaura and of Phyllocladus trichomanoides D.Don

1959 ◽  
Vol 7 (3) ◽  
pp. 252 ◽  
Author(s):  
RL Bieleski
Keyword(s):  
Light Intensity ◽  
Frequency Distribution ◽  
High Light Intensity ◽  
High Light ◽  
Low Light ◽  
Factors Affecting ◽  
Light Intensities ◽  
Seedling Distribution ◽  
Conifer Seedling ◽  
Effect Of Light

A method for determining the effect of light on seedling distribution in the field is described. It can be applied when seedling frequencies are as low as 1/m2. The frequency distribution of light intensities occupied by seedlings in a quadrat is compared with the frequency distribution of light intensities measured on a grid in the quadrat. This method was used to study the effect of light intensity on the establishment of two New Zealand gymnosperms, kauri (Agathis australis) and Phyllocladus trichomanoides, in the nursery community, a semimature Leptospermum scoparium – L. ericoides associes. Kauri and Phyllocladus did not occur at light intensities below 0.015 and 0.018 full daylight respectively. This limitation appeared to be due to the low light intensity presumably limiting photosynthesis. Kauri, but not Phyllocladus, also showed a high light intensity limit, at 0.30 full daylight, above which seedlings did not establish. Reasons are given for considering this as an indirect effect, probably through related solar heating affecting soil temperature or moisture. The optimal light intensity for kauri and Phyllocladus seedling establishment was close to the modal light intensity under the Leptospermum community: Leptospermum spp. were incapable of regenerating under their own cover. These two reasons appear to explain the suitability of the Leptospermum community as a nurse crop for the two conifer seedling species.

Sign in / Sign up

Export Citation Format

Share Document