Pre-sowing treatment for improving seed quality in West African rice varieties: i. seed germination and vigor

2009 ◽  
Vol 37 (1) ◽  
Author(s):  
MO Ajala ◽  
MA Adebisi ◽  
KO Fasan
Keyword(s):  
Seed Germination ◽  
Seed Quality ◽  
West African ◽  
Rice Varieties ◽  
African Rice

scholarly journals Effect of salt stress on physiological response and leaf polyamine content in NERICA rice seedlings

2011 ◽  
Vol 57 (No. 12) ◽  
pp. 571-576 ◽  
Author(s):  
A. Yamamoto ◽  
H. Sawada ◽  
I.S. Shim ◽  
K. Usui ◽  
S. Fujihara
Keyword(s):  
Salt Stress ◽  
Salt Tolerance ◽  
Rice Variety ◽  
West African ◽  
Rice Seedlings ◽  
Rice Varieties ◽  
Stress Injury ◽  
African Rice ◽  
Polyamine Content ◽  
Vigorous Growth

NERICA is a new African rice variety, developed by the West African Rice Development Association (WARDA) in 1990s. NERICA rice shows both vigorous growth and tolerance of stressors such as drought and disease. The purpose of this study was to clarify the physiological and biochemical responses to salt stress of NERICA rice seedlings. The degree of growth inhibition caused by salt stress was small in NERICA rice varieties as compared with japonica Nipponbare. Na accumulation in leaf blades was high in salt-sensitive varieties. Accumulation of proline, a known compatible solute, was also induced by salt stress, especially in salt-sensitive varieties; it was thought that this accumulation was brought on salt-stress injury. The contents of polyamines, especially spermidine, were high in the pre-stressed leaf blades of NERICA rice seedlings. After the salt-stress treatment, the polyamine content of leaf blades differed with the degree of salt tolerance of the NERICA rice seedlings. These results suggested that the salt tolerance of NERICA rice seedlings might be associated not only with the regulation of Na absorption and translocation but also with their ability to maintain leaf polyamine levels under salt-stress conditions.  

Storage and hydro-priming treatments to improve the seed quality of two traditional rice varieties; Batapola-el and Suwendal, from Sri Lanka

2020 ◽  
Vol 57 (1) ◽  
pp. 25-35
Author(s):  
MO Galappaththi ◽  
KMGG Jayasuriya ◽  
NS Gama-Arachchige
Keyword(s):  
Sri Lanka ◽  
Seed Germination ◽  
Seed Quality ◽  
Seedling Emergence ◽  
Seed Viability ◽  
Rice Varieties ◽  
Seed Vigour ◽  
Sowing Season ◽  
Traditional Rice

Although the demand for traditional rice varieties has increased, low initial germination and poor storability of these varieties impede its popularization. Thus, the aim of the study was to improve the seed quality using priming treatments and to suggest an effective storage practice of two of the traditional rice varieties; Suwendal and Batapola-el, in Sri Lanka. Seeds were subjected to hydro-priming under various time periods (0, 24, 48 and 72 hours). Seeds were stored in gunny, polysac and polythene bags at room temperature, 25 and 8 °C. Seed quality of primed and stored seeds was evaluated using seed germination, seed vigour (seedling growth and conductivity) and seedling emergence. Hydro-priming for 72 hours has increased the seed germination of the two varieties significantly compared to other priming methods. Further, seeds primed for 72 hours had the highest vigour and highest seedling emergence in both varieties. Storing Suwendal and Batapola-el seeds in polythene bags at 8 °C retained the highest viability and highest vigour for more than six months. Thus, hydro-priming for 72 hours could be recommended to enhancethe seed quality of these two tested varieties and storage at 8 °C in sealed polythene bags could be recommended as an effective storage practice to maintain the seed viability till the next sowing season.

scholarly journals Prevalence of Fungi With Seeds of Twenty Brri Released Rice Varieties and Seed Quality Analysis

2018 ◽  
Vol 44 (1) ◽  
pp. 79-89
Author(s):  
Tania Sultana ◽  
S Shamsi ◽  
MA Bashar
Keyword(s):  
Seed Germination ◽  
Seed Quality ◽  
Bipolaris Sorokiniana ◽  
Quality Analysis ◽  
Rhizopus Stolonifer ◽  
Seedling Mortality ◽  
Rice Varieties ◽  
Penicillium Sp ◽  
Fusarium Sp ◽  
Fungal Association

A total of 20 rice varieties of BRRI dhan 56 to BRRI dhan 75 were collected from Bangladesh Rice Research Institute (BRRI) for seed quality analysis, detection and identification of fungi associated with seeds of selected rice varieties. Dry inspection indicated that the percentage of pure seeds ranged from 90 - 100. The highest percentage of pure seed was found in BRRI dhan 66 and BRRI dhan 70 (100) and lowest in BRRI dhan 68 (90). A total of 21 fungal species were isolated from the selected rice varieties following “Blotter and Tissue Planting” methods. They were Alternaria padwickii, A. tenuissima, Aspergillus flavus, A. fumigatus, A. niger, A. ochraceus, A. clavatus, A. terreus, Bipolaris sorokiniana, B. spicifera, Chaetomium globosum, Curvularia lunata, Drechslera oryzae, Fusarium sp.1, Fusarium sp. 2, Nigrospora sp., Penicillium sp., Pestalotiopsis guepinii, Rhizopus stolonifer, Syncephalastrum racemosum and Trichoderma viride. Among them Penicillium sp., Drechslera oryzae, Aspergillus ochraceus, A. flavus, A. fumigatus, A. niger and Fusarium sp.1 were predominant in most of the rice varieties. In Tissue Planting method Drechslera oryzae showed the highest mean per cent frequency (6.69) and lowest was in the Bipolaris sorokiniana (0.41). Maximum total fungal association was recorded in variety BRRI dhan 61 (156.79%) and minimum in BRRI dhan 66 (24.69%). In Blotter method Penicillium sp. showed the highest mean per cent frequency (7.56) and lowest was in Rhizopus stolonifer (1.71). Maximum total fungal association was recorded in BRRI dhan 63 (147.37%) and minimum in BRRI dhan 65 (19.21%). Germination percentage of seeds was highest in BRRI dhan 66 (88) followed by BRRI dhan 67 (82), BRRI dhan 74 (80) and lowest in BRRI dhan69 (24). The percentage of seedling mortality was highest in BRRI dhan 63 (42) and lowest in BRRI dhan 74 (8.0) followed by BRRI dhan 67 (10). Correlation coefficient and regression analysis indicated that prevalence of fungi has significant effect on seed germination and seedling mortality. The present research work suggests that out of 20 BRRI rice varieties, BRRI dhan 65, BRRI dhan 66, BRRI dhan 67 and BRRI dhan 74 showed better performances on the basis of percentage of pure seed, fungal association, seed germination and seedling mortality. Asiat. Soc. Bangladesh, Sci. 44(1): 79-89, June 2018

scholarly journals The Use of Electrostatic Field to Improve Soybean Seed Germination in Organic Production

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1473
Author(s):  
Zlatica Mamlic ◽  
Ivana Maksimovic ◽  
Petar Canak ◽  
Goran Mamlic ◽  
Vojin Djukic ◽  
...  
Keyword(s):  
Seed Germination ◽  
Electrostatic Field ◽  
Seed Quality ◽  
18Th Century ◽  
Soybean Seed ◽  
Organic Production ◽  
Initial Growth ◽  
Physical Treatment ◽  
Soybean Seedlings ◽  
Dark Green

Soybean production in the system of organic agriculture is not very demanding, and this has been well documented both through experimental results and commercial production. However, one of the biggest problems in organic production is the lack of adequate pre-sowing treatments. Therefore, the aim of this study was to examine the effect of the electrostatic field. This is a physical treatment that was first used for seed treatment in the 18th century but has mostly been neglected since then. Seeds of five soybean genotypes with differently colored seed coats (yellow, green, dark green, brown, and black) were included in this study. The seeds were exposed to different values of direct current (DC) with the following voltages: 0 V (control), 3 V, 6 V, and 9 V, to which the seeds were exposed for 0 min (control), 1 min, and 3 min. After exposing the seeds to the electric field, the physiological properties of seeds and seedlings at the first stage of growth were evaluated. The results show that the effect of the electrostatic field on seed quality depends on the genotype, voltage, and exposure time. The application of DC can be a suitable method for improving seed germination and the initial growth of soybean seedlings. In addition, the results indicate that it is necessary to adjust the DC treatment (voltage and duration of exposure of seeds) to particular genotypes since inadequate treatments may reduce the quality of seeds.

scholarly journals Seed research for improved technologies

1998 ◽  
Vol 55 (spe) ◽  
pp. 19-26 ◽  
Author(s):  
R.J. Bino ◽  
H. Jalink ◽  
M.O. Oluoch ◽  
S.P.C. Groot
Keyword(s):  
Cell Cycle ◽  
Cell Proliferation ◽  
Quality Assurance ◽  
Seed Germination ◽  
Seed Quality ◽  
Molecular Level ◽  
Control Mechanisms ◽  
High Quality ◽  
Production Chain ◽  
High Quality Seed

The production of high-quality seed is the basis for a durable a profitable agriculture. After production, seed is processed, conditioned, stored, shipped and germinated. For quality assurance, seed quality has to be controlled at all steps of the production chain. Seed functioning is accompanied by programmed transitions from cell proliferation to quiescence upon maturation and from quiescence to reinitiation of cellular metabolism upon imbibition. Despite the obvious importance of these control mechanisms, very little information is available at the molecular level concerning those elements that regulate seed germination. In the present study, the induction of cell cycle activity and the regulation of ß-tubulin expression is related to the water content and other physical properties of the seed.

scholarly journals Effect of Different Harvesting and Threshing Methods on Seed Quality of Rice Varieties

2017 ◽  
Vol 6 (8) ◽  
pp. 2375-2383 ◽  
Author(s):  
M. Govindaraj ◽  
P. Masilamani ◽  
D. Asokan ◽  
P. Rajkumar ◽  
P. Selvaraju
Keyword(s):  
Seed Quality ◽  
Rice Varieties

scholarly journals Emergence rate of seedlings from hard okra seed coats and seedling growth of some genotypes of West African okra (Abelmoschus caillei)

2019 ◽  
Vol 11 (2) ◽  
pp. 118-122
Author(s):  
P.M. Jonah ◽  
G. K. Farauta ◽  
Y. M. Kwaga ◽  
H. E. Shehu ◽  
N. M. Fakuta ◽  
...  
Keyword(s):  
Seed Germination ◽  
Seedling Growth ◽  
Seedling Emergence ◽  
West African ◽  
Permeability Barrier ◽  
State University ◽  
Cropping Season ◽  
Emergence Rate ◽  
Emergence Percentage ◽  
Seed Coats

Abstract. In 2017 and 2018 cropping season, field experiment was conducted at the Food and Agricultural Organization and Tree Crop Plantation, Department of Crop Science, Adamawa State University, Mubi using fifteen genotypes of West African okra. The study was undertaken to study the emergence rate of seedlings from hard okra seed coats, seedling growth and their development. The seeds of the genotypes were soaked in NaCl solution for 24 hours to accelerate the breaking of seed dormancy and to ease seed germination. Tough seed coat usually impairs seed germination by establishing a permeability barrier which can interrupt water uptake required for imbibition, radicle and seedling emergence. The combined analysis results revealed a highly significant (P≤0.01) difference among these genotypes with respect to days to first and 50% flowering including days to first harvest. Furthermore, accession 3 (NG/SA/DEC/07/0448) and accession 11 (Yar kwadon) flowered earlier, had shortest days to first harvest, recorded the highest number of seedlings and emergence percentage than the other genotypes studied.

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