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Physiological Evaluation of Eggplant Genotypes for Waterlogging Tolerance

Jalal Uddin Ahmed
Professor
Department of Crop Botany, BSMRAU, Gazipur

Abstract/ Executive Summary:

In the present experiment a wide variation was recorded among the 43 collected eggplant genotypes in respect of morpho-physiological attributes demonstrating their potential to survive during the 1-week water logging period and more importantly to recover during the subsequent 2-week recovery period.Among the 43 eggplant genotypes in this experiment expressed a large genetic variation in morphological characters e.g. plant height, leaf number, leaf area per plant in 5-week old eggplant seedlings. Afterwards at the end of 1-week water logging treatment and subsequently 2-week recovery little increase in plant height (5.67 to 11.87cm), leaf number (3.0 to 7.0 cm) and leaf area (20 to 227 cm² per plant) were recorded due to water logging treatment compared to a large increase observed without water logging treatment. Increase in plant height, leaf number and leaf area in water logged plant when expressed as per cent of its respective control treatment during the same period, a closer performance reflected the water logging tolerance. As such, out of 43 genotypes in the present experiment the morphological characters of BARI Begun7 and BD-2687A demonstrated their better potential against water logging stress. At the time of imposition of flooding treatment the root dry matter, stem dry matter, leaf dry matter and total dry matter were found to differ widely among the 43 genotypes in the present experiment. Dry matter change occurring during the water logging and recovery stages in different parts like root, stem and leaf after the termination of water logging was found to be closer to their respective non-flooded treatment in BARI Begun7 and BD-2687A. Such minimum deviation of dry matter accumulation from the normal to water logging stressed conditions indicates their tolerance of the genotypes against the stress.

Keywords: Crop Botany, Waterlogging tolerance, Eggplant genotypes

Location: Genetics Resource Centre, BARI, Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Brinjal

Objectives:

The present project has been designed to test large number of eggplant genotypes against waterlogging stress and to identify promising varieties for achievable high yield target during the rainy season

Methodology:

A total of 43 eggplant genotypes were collected from Genetics Resource Centre, BARI, Gazipur and Department of Horticulture from the same institutes to use in the experiment. Out of 43 genotypes 10 were recognized varieties released by BARI. The seedling of eggplant genotypes were grown inside the vinyl-house. The seeds of each genotype were sown in directly in 3-plastic buckets. The soil of the bucket (growing pot) was prepared by mixing the soil and well decomposed cow-dung in a ratio of 8:1. No chemical fertilizer was added. Three plants of each genotype raised in one plastic pot were kept for flooding treatment and that of three raised another pot were put as control. After five weeks at the time of imposing flooding another three plants in a pot (of each genotype) were harvested (control one, Cl). Flooding treatment was imposed on plants of one pot by submerging the base of the seedling in a water tank of 5X2 m² in size. The flooding depth of 2.5 cm above the soil surface was maintained for one week. At the same time the optimal soil moisture (about 50% AWC) was provided to the plants retained as control. After one week the seedlings were removed from the tank, excess moisture drained out from the pot. The seedlings exposed to flooding (flooded plant, F) and that of control (control two, C2) were harvested after eight weeks of sowing proving two weeks recovery time for the flooded plants. After harvesting, the seedlings were segmented into components i.e. stem, leaf with petiole and root. The segmented parts were then oven dried at 72⁰C for seven days and dried weight was taken. Total dry weight (TDW) was calculated by summing up the stem (SDW), leaf (LDW) and root (RDW). Leaf area was measured using automatic leaf area meter (Model AAM-8, Hayashi Denkoh Co. Ltd., Tokyo, Japan). Number of leaves in each case was counted at the time of harvest. The relative performance (RP) in plant attributes during the 3-week period (1-week flooding + 2-week recovery period after flooding) was calculated using the following formula? Changes in flooded plants during 1-week flooding and 2-week recovery. RP/Changes in non-flooded plant during 1-week flooding and 2-week recovery X 100. F₁ - CI x 100; C₂ - C_l; Where F₁= Character measured in flooded plants after 1-week flooding and 2-week recovery Cl= Character measured in control plants just before flooding; C₂= Character measured in control plants after 1-week flooding and 2-week recovery.

Source of Information: Bangladesh Agronomy Journal, Vol: 13 (1-2), PP:, ISSN: 1013-1922, 2010

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Total dry weight (TDW) changes recorded at 8-week old seedlings in forty three genotypes due to water logging stress was smallest in BARI Begun 7 and BD-2687A relative to their respective change occurred in non-flooded condition during the same period of time. However, the largest change in total dry matter due to water logging relative to that change occurring in non-flooded plants was recorded in BD-2702, indicating its water logging sensitivity of the genotype. It is interesting to note that among the 10 recommended varieties tested in the present experiment other than BART Begun7 all were found to express inconsistent behavior to water logging stress indicating their sensitivity. However, water logging tolerance at reproductive stages along with production potential of the studied genotypes may be suggested for further studies under field conditions.

Knowledge Management: Journal