Induction, rooting, and growth capacity of adventitious shoots of Pinuscontorta

1993 ◽  
Vol 23 (9) ◽  
pp. 1907-1916 ◽  
Author(s):  
Gunnar Flygh ◽  
Roland Grönroos ◽  
Sara Von Arnold
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Vascular Tissue ◽  
Adventitious Shoots ◽  
Zygotic Embryos ◽  
Pulse Treatment ◽  
Vascular Cylinder ◽  
Adventitious Buds ◽  
Fresh Weight ◽  
Relative Growth

Zygotic embryos of Pinuscontorta Dougl. ex Loud, developed adventitious buds after a pulse treatment with 250 μM benzyladenine for 2 h. The number of embryos forming adventitious buds, as well as the number of adventitious buds per embryo, depended on the length of time after pulse treatment before the embryos were transferred to fresh medium. Adventitious shoots pulse-treated with 1.23 mM indole-3-butyric acid for 6 h started to develop roots within 3 weeks and after 3 months 75% of the shoots had developed roots. Roots usually emerged from vascular tissue that was connected to the vascular cylinder in the stem. However, roots could also be initiated directly from the vascular cylinder in the stem. The average relative growth rate per day for plantlets was 5.9% compared with 9.3% for seedlings. However, there was a correlation between the initial weight of the plantlets and their relative growth rate per day. Thus, plantlets classed in the group with highest initial fresh weight had a relative growth rate of 7.3%. Differences in growth rate between plantlets and seedlings are discussed.

scholarly journals RESPON PERTUMBUHAN DAN PERKEMBANGAN SAYUR PELENG (Spinacia oleracea) TERHADAP PEMBERIAN PUPUK ORGANIK CAIR PADA BERBAGAI MULSA

2020 ◽  
Vol 28 (1) ◽  
pp. 116
Author(s):  
Robert G. Marpaung ◽  
Boy Pasaribu
Keyword(s):  
Growth Rate ◽  
Plant Height ◽  
Relative Growth Rate ◽  
Organic Fertilizer ◽  
Dry Weight ◽  
Fertilizer Treatment ◽  
Fresh Weight ◽  
Plastic Mulch ◽  
Relative Growth ◽  
Number Of Leaves

This study aims at determing the response of growth and production of peleng vegetables to the application of liquid organic fertilizer in various mulch. The study was conducted on land located in Simalingkar A Medan with a height of ± 32 m above sea level, began from May to August 2017. The research method used a factorial randomized block design with 2 factors. The first factor is the dose of NASA liquid organic fertilizer (P) which consists of 3 levels of treatment, namely: P0 = control, P1 = 3 ml / l water and P2 = 6 ml / l water. The second factor is the provision of mulch (M) which consists of three types, namely: M0: without mulching, M1: rice straw mulch and M2: black silver plastic mulch (MPHP). The results showed that the treatment of NASA liquid organic fertilizer up to 6 ml / l water significantly increased plant height, number of leaves, fresh weight of plants per sample, fresh weight of plants per plot, dry weight of plants per sample and dry weight of plants per plot, but differed not markedly on the relative growth rate of plants. The treatment of organic mulch and black silver mulch significantly increased plant height, number of leaves, fresh weight of plants per sample, fresh weight of plants per plot, dry weight of plants per sample and dry weight of plants per plot, but not significantly different to the relative growth rate of plants. The interaction between NASA's liquid organic fertilizer treatment and mulch administration had no significant effect on plant height, number of leaves, plant fresh weight per sample, plant fresh weight per plot, plant dry weight per sample, plant dry weight per plot and relative plant growth rate

scholarly journals Mitigating chilling stress of pepper plant (Capsicum annuum L.) using Dimethyl Ether combustion gas in controlled greenhouse

2019 ◽  
pp. 1992-2002
Author(s):  
Jayanta Kumar Basak ◽  
Waqas Qasim ◽  
Frank Gyan Okyere ◽  
Fawad Khan ◽  
Yong Jin Lee ◽  
...  
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Chilling Stress ◽  
Winter Season ◽  
Pepper Plant ◽  
Fresh Weight ◽  
Relative Growth ◽  
Combustion Gas ◽  
Morphology Parameters

In this study, the possibility of enhancing chilling stress tolerance of pepper plant (Capsicum annuum Linnaeus) during early growth stages was investigated using DME combustion gas in controlled greenhouse. The experiment was conducted to determine the performance of DME combustion gas when used as a fuel for DME burner for raising temperature and CO2 concentration in greenhouse and also to examine its effects on morphology parameters of hot pepper in winter season. To analyze the relationship between the application of DME and morphology parameters of pepper plant, three treatments (DME-1, DME-2 and DME-3) for three controlled greenhouses were assayed. DME-1 and DME-2 treatments consisted of average DME flow quantity in duct were 17.4 m3/min and 10.2 m3/min, respectively to greenhouse-1 and greenhouse-2 and no DME gas was supplied to greenhouse-3 which was left as control (DME-3). Morphology parameters such as plant height, leaf area and leaf area index (LAI), net assimilation rate (NAR), relative growth rate (RGR), fresh weight and dry weight were measured for eight weeks for each treatment and analyzed using completely randomized designs through analysis of variance with a significance level of P < 0.05. Although DME-1, DME-2 and DME-3 received same crop management practices and controlled environmental factors, the highest changes (p < 0.05) of plant height, leaf area, LAI and fresh weight were found from the DME-1 treatment, followed by DME-2. A comparison of relative growth rates among the treatments indicated more rapid relative growth rate of morphology parameters at vegetative phase of plant implying better yield. Therefore endorsed quantify of DME combustion gas for a specified crop can be applied to greenhouse to improve the plant growth and enhance yield with mitigating chilling stress in winter season.

scholarly journals Toxic Effects of Water Soluble Fractions of Crude Oil, Diesel and Gasoline on Ceratophyllum Demersum

2017 ◽  
Vol 2 (2) ◽  
pp. 6
Author(s):  
Eshagberi G.O.
Keyword(s):  
Growth Rate ◽  
Crude Oil ◽  
Relative Growth Rate ◽  
Biomass Production ◽  
Diesel Fuel ◽  
Water Soluble ◽  
Ceratophyllum Demersum ◽  
Fresh Weight ◽  
Relative Growth ◽  
Soluble Fractions

Abstract- Oil exploration and exploitation has resulted in oil pollution in the Niger Delta. This study investigated the toxicity of water soluble fractions (WSFs) of crude oil, diesel fuel and gasoline on Ceratophyllum demersum (L).  The parameters measured include fresh weight, biomass production and relative growth rate.  The water soluble fractions concentrations used were 25%, 50% 100% for crude oil and diesel and 5%, 10%, 20% were used for gasoline.  Results from the study showed that at 25% WSF of crude oil and diesel fuel and 5% WSF of gasoline, there was significant increase (P < 0.05) in fresh weight, biomass production and relative growth rate of Ceratophyllum demersum. While increase in concentration resulted in decrease in the growth parameters.  High concentrations of Water Soluble Fractions of gasoline were the most toxic followed by diesel fuel. This study showed that low concentration of water soluble fractions of petroleum hydrocarbons enhanced growth while high concentration was toxic to the aquatic macrophyte.   Keywords: Crude oil, diesel, gasoline, Ceratophyllum demersum.

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