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Effect of Growth Regulators on Physiological Characters and Yield of Mungbean [vigna Radiata (l.) Wilczek] Under Water Stress

M. S. Islam
Department of Agronomy, Sher-e- Bangia Agricultural University, Dhaka- 1207

M. A. Karim
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1703

A. Hamid
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1703

M. M. Haque
Department of Agronomy , Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur- 1703

Abstract/ Executive Summary:

A pot experiment was conducted under a rain- out shelter at Bangabandhu Sheikh Mujibur Rahman Agricultural University to evaluate the effect of benzylaminmopurine (BAP) and Naphthalene acetic acid (NAA) on physiological characters and yield of mungbean variety/genotype (BARI Mung 2 and ML 613) under water stress condition. Water stress was imposed at 20 days after emergence (DAE) withholding irrigation and rewatering was done at each wilting with water of 50% field capacity. Only water stressed plants were treated with BAP and NAA at 27 DAE @ 100, 200 and 400 ppm, and then combinations. All the physiological characters were measured at first flowering. Water stress reduced relative water content (RWC), exudation rate (ER), leaf water potential (LWP), shoot dry matter (SDM) in both the genotypes, whereas increased specific leaf area (SLA) in ML 613 and decreased in BARI Mung 2. Most of the growth regulator (GR) treatments increased RWC, ER, LWP and SDM under water stress in both the genotypes and increase was found highest with 100 ppm BAP whereas decreased SLA which was found lowest with the same treatment. Treatment effects of 100 ppm BAP for all the parameters were correlated with the higher seed yield obtained from the same treatment but other treatments for the same parameters were not correlated with seed yield that might be due to toxic effects of higher concentrations of growth regulators (GR) after first flowering.

Keywords: Water relations, Physiological characters, Water stress, Mungbean, Yield

Location: Bangabandhu Sheikh Mujibur Rahman Agricultural University

Start Date: 00-03-2006

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

To analyze the role of BAP and NAA on physiological characters and yield of mung bean genotypes under water stress.

Methodology:

A pot experiment was conducted under a rain-out shelter at the Agronomy Farm of Bangabandhu Sheikh Mujibur Rahman Agricultural University in March 2006 with previously selected one high yielder (BARI Mung 2) and one low yielder (ML 613) of mungbean genotypes to study the effect of plant growth regulators, viz., benzylaminopurine (BAP) and naphthalene acetic acid (NAA) on water stress tolerance. Eleven treatments were imposed as, W_OG_o = No water stress + No growth regulators (GR), WSGo = Water stress (WS) + No GR, WSB_lOO = WS + 100 ppm BAP, WSB₂₀₀ = WS + 200 ppm BAP, WSB₄₀₀ = WS + 400 ppm BAP, WsN_lOO = WS + 100 ppm NAA, WSN₂₀₀ = WS + 200 ppm NAA, WSN₄₀₀ = WS + 400 ppm NAA, WSB_lO0N_lO0 = WS + 100 ppm BAP + 100 ppm NAA, WSB₂₀₀N₂₀₀ = WS + 200 ppm BAP + 200 ppm NAA, WSB_4ooN_4oo = WS + 400 ppm BAP + 400 ppm NAA. Seeds of mungbean variety/genotype were sown in plastic pots of 25 cm in diameter and 30 cm in height. Each pot was uniformly filled with 12 kg air-dried soil, compost (1/4 th of the soil mass) and 0.270, 0.600 and 0.348 g urea per pot, triple super phosphate and muriate of potash corresponding to 20.7- 20.6- 28.9 kg N, P and K per hectare, respectively .The experiment was laid out in a Completely Randomized Design with double plant four replications of each treatment. Water stress was imposed withholding irrigation throughout the growing period. Plants were re-watered with irrigation water of 50% field capacity (FC) at appearance of wilting symptom. The aboveground plant parts were separated at first flowering, gently washed with tap water, air-dried and then oven dried at a constant weight to record the data on dry matter. The data on RWC, ER, LWP and SLA were recorded at first flowering from first fully expanded leaf of mung bean plants in different treatments. The leaf samples were cut with a sharp knife with petiole and were put in a polyethylene bag treatment wise. The bags were kept on a tray and wrapped with a moist towel to avoid light and desiccation. Then the samples were brought in the laboratory and their fresh weights were recorded immediately. The leaf samples were then dipped in water for 24 hour and their turgid weight were recorded after soaking the leaf surface water by paper towel. The samples were then oven dried to constant weight. The plant water status was measured using the following formulae: Relative water content (RWC %)=[(Fresh weight-Dry weight)/(Turgid weight--dry weight)] x 100 and The exudation rate was calculated by deducting cotton weight from the sap containing cotton weight and was expressed per hour basis as follows: Exudation rate = ((Weight of cotton + sap) - (Weight of cottonl)/Time (hr.)

Source of Information: Bangladesh Agron. J 2009, 12 (1 & 2): 57-64, ISSN 1013-1922

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Water stress reduced relative water content (RWC), exudation rate (ER), leaf water potential (LWP), shoot dry matter (SDM) in both the genotypes, whereas increased specific leaf area (SLA) in ML 613 and decreased in BARI Mung 2. Most of the growth regulator (GR) treatments increased RWC, ER, LWP and SDM under water stress in both the genotypes and increase was found highest with 100 ppm BAP whereas decreased SLA which was found lowest with the same treatment. Treatment effects of 100 ppm BAP for all the parameters were correlated with the higher seed yield obtained from the same treatment but other treatments for the same parameters were not correlated with seed yield that might be due to toxic effects of higher concentrations of growth regulators (GR) after first flowering.

Knowledge Management: Journal