scholarly journals Mapping of QTLs controlling seedling establishment using a direct seeding method in rice

2010 ◽  
Vol 60 (4) ◽  
pp. 353-360 ◽  
Author(s):  
Natsuko Iwata ◽  
Hiroshi Shinada ◽  
Hitoshi Kiuchi ◽  
Takashi Sato ◽  
Kenji Fujino
Keyword(s):  
Seedling Establishment ◽  
Direct Seeding ◽  
Seeding Method

Direct seeding of black spruce in northwestern Ontario: Seedbed relationships

1994 ◽  
Vol 70 (2) ◽  
pp. 151-158 ◽  
Author(s):  
R. L. Fleming ◽  
D. S. Mossa
Keyword(s):  
Seedling Establishment ◽  
Black Spruce ◽  
Mineral Soil ◽  
Soil Surface ◽  
Direct Seeding ◽  
First Year ◽  
Strongly Correlated ◽  
Seedling Mortality ◽  
Northwestern Ontario ◽  
Seedbed Preparation

A series of spot seeding experiments was set out on coarse-textured upland sites in northwestern Ontario to investigate how black spruce (Picea mariana [Mill.] B.S.P.) seedling establishment and growth could be improved by site selection and seedbed preparation. Virtually all germination occurred within the first growing season. Annual seedling mortality rates were greatest during the first year, then declined steadily and stabilized at low levels (<10%) after the third year. The highest fifth-year establishment ratios (seedlings/viable seed sown) were found on seedbeds derived from materials near the mineral soil/humus interface. On wetter sites (i.e., higher Soil Moisture Regimes) the best seedbeds occurred closer to the soil surface. Mean fifth year establishment ratios for the best seedbeds were 0.032 on moderately fresh to fresh sites, 0.146 on very fresh to moderately moist sites, and 0.082 on moist to very moist sites. On adjacent lowland sites, slow-growing, compact Sphagnum mosses had a mean establishment ratio of 0.179. Mean fifth-year seedling heights on upland sites ranged from 12 to 14 cm, and were not strongly correlated with site or seedbed type. Key words: direct seeding, black spruce, seedbed, seedling establishment, site type and germination

scholarly journals Rice Direct Seeding Method with Recycled-paper Mulching

1999 ◽  
Vol 2 (1) ◽  
pp. 53-57 ◽  
Author(s):  
Hideto Ueno ◽  
Motoko Shimura ◽  
Minoru Yamauchi
Keyword(s):  
Direct Seeding ◽  
Recycled Paper ◽  
Seeding Method

scholarly journals Studies on High Frequency Shoot Regeneration in Sesame (Sesamum indicum L.)

2012 ◽  
Vol 21 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Bangaramma S. Wadeyar ◽  
R. Lokesha
Keyword(s):  
Key Words ◽  
Shoot Regeneration ◽  
Plant Tissue ◽  
High Frequency ◽  
Sesamum Indicum ◽  
Direct Seeding ◽  
The Other ◽  
Seeding Method ◽  
Regeneration Response ◽  
High Sucrose

High frequency shoot regeneration was attempted in sesame (Sesamum indicum L. Pedaliaceae), using five genotypes/varieties viz. Tumkur and Gulbarga Locals (land races), W-II, E-8 and DS-1 (varieties). The hypocotyl-derived callus obtained through direct seeding method was placed on MS with five different treatments viz. pre-culture of callus on high sucrose (6 - 9%) for two weeks and transferring on to plain MS with 3% sucrose, MS with variable concentrations of TDZ alone, MS with constant TDZ and variable concentrations of BA and IAA, MS with variable concentrations of BA and IAA without TDZ, MS with ABA and AgNO3 and MS with BAP, NAA and AgNO3.  Highest frequency of cent per cent shoot regeneration was initiated in variety DS-1on MS containing NAA 2.5 mg/l, BAP 3.5 mg/l and 20 µM AgNO3 with 2.50 mean shoots/callus followed by 91.6% in variety W-II on MS containing 25 µM TDZ with 2.20 mean shoots/callus. The other treatments had poor shoot regeneration response. The results have been discussed in the light of sesame improvement through biotechnological ways.   Key words: Sesamum indicum, hypocotyl, high frequency,  shoot regeneration   D. O. I. 10.3329/ptcb.v21i1.9562   Plant Tissue Cult. & Biotech. 21(1): 45-52, 2011 (June)

scholarly journals Root knot nematode infections promoted by agricultural practice modifications in Vietnam and the impacts on rice production

2020 ◽  
Vol 42 (3) ◽  
Author(s):  
Nguyen Thi Hue ◽  
Anne -Sophie Masson ◽  
Lionel Moulin ◽  
Trinh Quang Phap ◽  
Ha Viet Cuong ◽  
...  
Keyword(s):  
Crop Rotation ◽  
Rice Variety ◽  
Its Region ◽  
Direct Seeding ◽  
Parasitic Nematodes ◽  
Agricultural Practice ◽  
Root Knot Nematode ◽  
Meloidogyne Graminicola ◽  
Seeding Method ◽  
The Impact

A survey conducted on newly cultivated lowland rice fields by direct seeding method in Hai Duong Province, Viet Nam, in March 2017 revealed high devastation of the field. In these fields, farmers used an annual crop rotation cycle of rice-scallion-rice. Investigations on the devastated fields revealed that the chemical and physical soil properties were appropriate for rice cultivation. On the other hand, observations done on the root systems showed that the dead plants have symptomatic root galls suggesting the presence of plant parasitic nematodes. Sequencing of the internal transcribed spacer (ITS) region of the rDNA genes of the nematodes showed that the root nematodes extracted from the infested fields belonged to Meloidogyne graminicola. The reproductive factor of the isolated M. graminicola population on the IR64 rice variety (Oryza sativa indica) was normal, suggesting that the impact of this plant pest was not due to the emergence of an unusual virulent population. The combination of the three factors (wrong cropping choice for rotation, using rice variety susceptible to M. graminicola and direct seeding) were obviously promoting the nematode infection and its high proliferation in the surveyed fields. Meloidogyne graminicola could parasitize and propagate in scallions of Vietnam. Since this plant is annually cultivated on a paddy field for crop rotation, preventive measures or alternative plant for crop rottion is necessary.   

Elongation habit of mesocotyls and coleoptiles in weedy rice with high emergence ability in direct-seeding on dry paddy fields

2010 ◽  
Vol 61 (11) ◽  
pp. 911 ◽  
Author(s):  
Nam-Jin Chung
Keyword(s):  
Genetic Resources ◽  
Paddy Soil ◽  
Seedling Establishment ◽  
Large Scale ◽  
Soil Surface ◽  
Direct Seeding ◽  
Weedy Rice ◽  
Burial Depth ◽  
Sowing Depth ◽  
Rice Germplasm

Direct-seeding of rice on dry paddy soil could enable large-scale cultivation and cost-savings, but still has some problems including poor seedling establishment caused by low temperature and varied sowing depth. This research was performed to identify weedy rice genetic resources that may help to eliminate the problem of poor seedling establishment in direct-seeded rice on dry paddy soil in temperate regions. The genetic resources screened in this study were 128 genotypes consisting of 92 japonica weedy rices, 24 indica weedy rices, and 12 Korean bred cultivars. On average, weedy rice germplasm had superior abilities to emerge from greater depths than cultivated rices. Coleoptile and mesocotyl lengths were highly positively correlated with the emergence rate. Among the weedy rice germplasm, the japonica weedy rice WD-3 showed the highest level of emergence with the longest coleoptile and mesocotyl. The emergence ability of WD-3 was confirmed in both phytotron and field conditions. In the emerged plants in the field, the mesocotyl elongation increased with increasing burial depth in a logarithmic fashion, and coleoptile extension increased exponentially. The mesocotyl and coleoptile elongated to a length of seed burial depth, indicating that the mesocotyl and coleoptile of WD-3 could induce the safe development of the first leaf of the seedling at the soil surface. Therefore, the elongation habit of the mesocotyl and coleoptile of WD-3 could be one of the most important characteristics for the development of direct-seeding cultivars.

scholarly journals Osmotic treatment, growth regulator and rooter in Tabebuia roseoalba (RIDL.) Sandwith seeds for direct sowing

2020 ◽  
Vol 42 ◽  
Author(s):  
Alexandre Carneiro da Silva ◽  
Maiara Pilar Palmeira da Silva ◽  
Rayssa Zamith ◽  
Gustavo Galetti ◽  
Fatima Conceição Márquez Piña-Rodrigues
Keyword(s):  
Seedling Establishment ◽  
Forest Restoration ◽  
Germination Rate ◽  
Seedling Emergence ◽  
Direct Seeding ◽  
Germination Test ◽  
Toxicity Effect ◽  
Induced Stress ◽  
Osmotic Treatment ◽  
Direct Sowing

Abstract: Direct seeding is a technology that reduces the costs of forest restoration projects and favors species which are difficult to establish for seedlings. The seeds osmotic treatment to accelerate and standardize germination and induce tolerance to environmental stresses may favor seedling establishment in field through direct sowing and contribute to the greater efficiency of this technique. With the purpose of favor seed germination and seedling establishment under direct seeding conditions in the field, Tabebuia roseoalba osmoprimed seeds in polyethylene glycol (PEG) solution and unconditioned seeds were treated with isolated and/or combined solutions of plant growth regulators (PGR) and rooting (RTG). These seeds were submitted to germination test and evaluated for percentage germination rate, germination speed index and normal seedlings, and to seedling emergence test by direct field seeding. RTG had a toxic effect on T. roseoalba seeds. Osmoconditioning induced stress tolerance by RTG during germination and on seedling establishment. PGR treatment favors seedling emergence in field conditions and alleviates the toxicity effect caused by RTG. These treatments have great potential for use in direct sowing of T. roseoalba seeds.

scholarly journals Yield of Sweet Pepper (Capsicum annuum) Cultivars in Northwestern Puerto Rico

1969 ◽  
Vol 61 (1) ◽  
pp. 90-99
Author(s):  
Angel C. Serrano Pérez
Keyword(s):  
Puerto Rico ◽  
Capsicum Annuum ◽  
Environmental Conditions ◽  
Sweet Pepper ◽  
Direct Seeding ◽  
Yield Potential ◽  
Seeding Method ◽  
North Western

Ten sweet pepper cultivars were tested to determine their yield potential in north western Puerto Rico. Nine plantings were made from September 1970 to July 1972 using both transplant and direct seeding methods. Puerto Rico Wonder (bell type) and Blanco del País (condiment type) outyielded similar cultivars in all cases. They are well adapted to the environmental conditions of northwestern Puerto Rico. The best time for direct seeding appears to be January through April, while June is best for transplanting. Direct seeding is recommended because planting can be mechanized, setbacks avoided, and better yields harvested earlier. These two cultivars were reevaluated against Yolo Wonder Y and Cubanelle, using the direct seeding method. Six plantings were made from August 29, 1972, to June 6, 1973. The results confirmed previous findings.

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