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Performance of Gerbera Cultivars Under Different Wavelengths of Solar Spectrum

H. Mehraj
Department of Horticulture, Sher-e-Bangla Agricultural University,Dhaka-1207, Bangladesh.

T. Taufique
Department of Horticulture, Sher-e-Bangla Agricultural University,Dhaka-1207, Bangladesh.

A.F. Ona
Department of Horticulture, Sher-e-Bangla Agricultural University,Dhaka-1207, Bangladesh.

A. Nusrat
Department of Horticulture, Sher-e-Bangla Agricultural University,Dhaka-1207, Bangladesh.

A.F.M. Jamal Uddin
Department of Horticulture, Sher-e-Bangla Agricultural University,Dhaka-1207, Bangladesh.

Abstract/ Executive Summary:

To find out the response of potted gerbera under different light spectrum wavelengths of solar radiation was carried out. Three gerbera cultivars viz. V₁ (red), V₂ (pink), V₃ (brick red) and seven treatments viz. L₁ (full spectrum), L₂ (no spectrum), L₃ (cut of 380-750nm wavelength), L₄ (cut of 620- 750nm wavelength), L₅ (cut of 450 - 495nm wavelength), L₆ (cut of 495 - 570nm wavelength) and L₇ (cut of 570 -590nm wavelength) were exerted on the experiment. Among the cultivars brick red was the best one. Plants were green because they reflected 495- 570nm wavelengths (green band) from the visible spectrum of solar radiation.Current findings indicated that of 495 -570nm wavelengths (green band), the plants responded alike to the full spectrum. No spectrum provided the worst result in all attributes of gerbera. Number of flower, peduncle length, peduncle diameter, flower head diameter and bending percentage were least after no spectrum in all the treatments. All the treatments except full spectrum and of 495 - 570nm wavelength (green band) restricted for the entrance of the 620- 750nm wavelength (red band); 620- 750nm wavelength (red band) of light was very important for the plants. Besides, absence of 620-750nm wavelengths (red band) and 450- 495nm wavelength (blue band) drastically hampered plant growth, yield and quality contributing characters.

Keywords: Gerbera, Variety, Lightwavelength, Growth

Location: Horticulture Farm, Sher-e-BanglaAgricultural University, Dhaka, Bangladesh

Start Date: 00-12-2012

End Date: 00-06-2013

Program Area: Variety and Species

Commodity: Gerbera

Objectives:

To find out the response of potted gerbera varieties under different light spectrum wavelengths of solar radiation.

Methodology:

The study was conducted at the Horticulture Farm, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during December 2012 to June 2013 to find out growth and yield performance of potted gerbera against different light spectrum wavelengths of solar radiation. The two factorial experiments were laid out in complete randomized design (CRD) with five replications. Same aged seedlings were collected from local nursery, Dhaka. Soil and cow-dung (1:1) were mixed and pots were filled 7 days before transplanting. Recommended chemical fertilizers (NPK as 5, 10, and 5 g, respectively in each pot) were mixed with the soil. Three varieties were used in the experiment and these were symbolized by V₁ (red), V₂ (pink) and V₃ (brick red). On the other hand, different wavelengths were cut from light spectrum of solar radiation and these were symbolized by L₁ (Full spectrum), L₂ (no spectrum;black), L₃ (cut of 380 - 750nm wavelength; white), L₄ (cut of 620 -750nm wavelength; red), L₅ (cut of 450 -495nm wavelength; blue), L₆ (cut of 495-570nm wavelength; green), L₇ (cut of 570-590nm wavelength; yellow). Cut of different wavelengths was ensured by Spectrometer MR16. Data were collected on number of leaves, plant height, leaf area, chlorophyll percentage, days to first flower bud initiation, number of flower, peduncle length, peduncle diameter, flower head diameter and peduncle bending percentage from each pot within the period. Number of leaves, plant height and leaf area were measured at every 30 days interval from 30 DAT and continued up to 120 DAT. Leaf area, chlorophyll percentage and peduncle diameter were measured by using CL-202 Leaf Area Meter, SPAD-502 Chlorophyll Meter and Digital Caliper-515 (DC-515), respectively. Chlorophyll percentage and peduncle diameter were measured at 90 DAT and full bloomed stage, respectively. All parameters were statistically analyzed by using MSTAT-C program. Mean for all the treatments was calculated, analysis of variance for each of the characters was performed by F-test and difference between treatments was evaluated by Least Significant Difference (LSD) at the 5% level of significance (Gomez and Gomez 1984).

Source of Information: Journal of Bangladesh Academy of Sciences, Vol.38, No.1,27-37,2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the gerbera cultivars V₃ provided maximum leaf area (37.9 cm²), chlorophyll (37.4%), number of flowers (16.7), peduncle length (32.6 cm) and diameter (2.8 mm), flower head diameter (10.2 cm), while least from V₁ . Minimum number of leaves (29.0), plant height (33.9 cm), days to flower bud initiation (102.6), bending (35.7%) were found in V₃, whereas maximum in V₁ . On the other hand, L₁ provided maximum number of leaves (35.2), leaf area (42.0 cm² ), chlorophyll content (46.2%), number of flower (18.1), peduncle length (36.2 cm) and diameter (3.2 mm), flower head diameter (10.5 cm) with minimum bending (5.4%) followed by L₆ whereas least from L₂ with maximum bending. V₃ L₁ was the best while V₁ L₂ was the lowest among the treatment combinations. From the above result and discussion it can be concluded that 620-750nm wavelength (red band) of light is a vital fact for growth and flowering of gerbera; 620 - 750 nm wavelength (red band) and 450-495nm wavelength (blue band) is important for quality flower production of gerbera.

Knowledge Management: Journal