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Soil Flooding Tolerance in Lentil at Vegetative Stage

B. Nessa
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. R. Islam
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

M. M. Haque
Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

J. U. Ahmed
Department of Crop Botany, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1706, Bangladesh

Abstract/ Executive Summary:

The experiment compared the relative tolerance of some advanced lines and a variety of lentil viz. BD3859, BD3905, BD3867, ILL5087, ILL5133 and BINAmasur1 (variety) to soil flooding. The growth rates of the genotypes considerably reduced when flooding imposed at vegetative stage. However, the genotypes responded differently to flooding onward during recovery period. Leaf and roots showed highly vulnerable to flooding. Flooding promoted extensive leaf senescence and desiccation. Flooding induced damaging of root system was highly striking, despite there existed remarkable recoveries in some genotypes. The adverse effect of flooding was less pronounced on stem than other plant components. However, shoot growth reduction was 76-86% relative to control. Relative growth rate (RGR) of most plant components showed negative rate during flooding, but it varied from negative to positive during recovery period. Considering total plant biomass, flooding tolerance (FT) indices indicated that BINAmasur1 and BD3859 had comparatively better degree of tolerance to excess water. In contrast, ILL5133 and ILL5087 were susceptible to flooding for having negative FT indices.

Keywords: Flooding, Lentil, Tolerance, Vegetative stage

Location: The Environmental Stress Research Site, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh

Start Date: 00-11-2005

End Date: 00-00-2006

Program Area: Crop-Soil-Water Management

Commodity: Lentil

Objectives:

To identify the study aims at evaluating the flooding induced changes in plant growth of lentil and estimating level of tolerance to soil flooding at vegetative stage.

Methodology:

The experiment was carried out in a vinyl house at the Environmental Stress Research Site of Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur from November 2005 to January 2006. The soil was silt loam and slightly acidic with very low content of nitrogen and medium amount of phosphorus. The mean monthly maximum temperature was in November (29.5^oC) and minimum in December (14.4^oC) during the experimentation. Six lentil genotypes viz. BD3859, BD3905, BD3867, ILL5087, ILL5133 and BINAmasur1 (variety) were used in the experiment. A total 180 seedlings of each genotype were grown in plastic trays of 20×14×5 cm size on 23 November 2005. The growth medium was soil and well decomposed cowdung in a ratio of 4 : 1. The seedlings were watered regularly to maintain optimum soil moisture condition until the flooding treatment was imposed. Half of the seedlings in each genotype were flooded at 22 days after emergence (DAE) by submerging the base of the seedlings in a water tank of 5 × 2 m in size and others were put as non-flooded control. Flooding was continued for 5 days maintaining depth of 1.5 cm above the soil surface. Thereafter, the seedlings were removed from the tank, excess moisture drained from the tray and the soil was kept optimum soil moisture condition. The optimal soil moisture was provided throughout to the plants retained as non-flooded control. A total six harvests were done for both flooded and non-flooded control at 22, 27, 32, 37, 42 and 52 DAE of which 22-27 DAE was considered as flooding period and 27-52 DAE as recovery period. At each harvest, data were recorded on plant height, number of leaves and plant components dry weight (DW) i.e. root, stem and leaf. Dry weights were taken after drying the plant parts in an oven at 80^oC to a constant weight. Total DW for both flooded and control plants was calculated by summing up the dry weights of root, stem and leaf and that of shoot DW by excluding root DW. The relative growth rate (RGR) of plant components biomass and total biomass were calculated as the change in biomass per unit time according to Radford (1967). The RGR of each plant attribute under flooded and control conditions were used to calculate flooding tolerance (FT) index according to Chen and Burton (1992) : FT = RGR (flooded)/RGR (non-flooded) × 100. The experiment was arranged in row (six genotypes)-column (two flooding treatments : flooded and non-flooded control) design and replicated fifteen times considering each plant as single replicate. Data recorded on plant height and number of leaves was compared using standard t-test.

Source of Information: Progress. Agric. 18(2) : 17-24, 2007 ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

However, shoot growth reduction was 76-86% relative to control. Relative growth rate (RGR) of most plant components showed negative rate during flooding, but it varied from negative to positive during recovery period. Considering total plant biomass, flooding tolerance (FT) indices indicated that BINAmasur1 and BD3859 had comparatively better degree of tolerance to excess water. In contrast, ILL5133 and ILL5087 were susceptible to flooding for having negative FT indices. Lentil can withstand 5-day flooding at vegetative stage, although the growth impaired to a great extent. Flooding greatly affected plant components and thereby accumulated lesser amount of total plant biomass. The genotypic differences in biomass accumulation during recovery were highly evident in the study. Among the tested genotypes, BINAmasur-1 had a fair degree of tolerance to soil flooding. However, evaluation of the genotypes under field condition would be necessary for affirmation of flooding tolerance in lentil.

Knowledge Management: Journal