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Evaluation of Mungbean Genotypes Tolerant to Soil Flooding

Dr. Md. Rafiqul Islam
Department of Agronomy, BSMRAU, Gazipur

Abstract/ Executive Summary:

In percent seedling emergence. Genotype BUmung4 gave better emergence, total stands and dry matter accumulation compared to BARImung4. Irrespective of genotypes, percent seedling emergence, total stands as well as total dry matter decreased with the increase of flooding duration. Seed priming had favorable effects on BUmung4, which produced the higher total dry matter under prime condition where as, BARImung4 produce the same under non-priming condition. Leaf area also showed similar trend as that of total dry matter. In contrast, flooding and seed priming treatments had little effect on plant height. In the second experiment, it was observed that the number of root nodules enhanced due to flooding. It rose to 34% higher over control when flooding prolonged for 4-days, thereafter it reduced to some extent with the extension of flooding. The genotypic differences in producing root nodules were not consistent with the duration of flooding. However, the genotype IPK2558-97 produced lesser amount of root nodules.

Keywords: Soil Flooded, Mungbean, Genotypes

Location:

Start Date: 01-07-2007

End Date: 30-06-2008

Program Area: Risk Management in Agriculture

Commodity: Mungbean

Objectives:

To evaluate the difference in flood tolerance of germinated seed in mungbean genotypes
To evaluate the root and leaf characteristics of mungbean in response to soil flooding; and
To assess the field performance of mungbean genotypes differing in flooding tolerance.

Methodology:

In order to achieve the objectives a series of experiments under semi-controlled and field conditions were carried out during August 2007 through June 2008 at BSMRAU, Gazipur. In the first experiment, two seed prime conditions (priming and non-priming) and five flooding regimes (saturation, 6 hrs, 12 hrs, 18 hrs and 24 hrs) along with control (no flooding) were imposed on two mungbean genotypes (BUmug4 and BARImug4). The plants were grown in plastic trays containing field soil. Flooding treatments were imposed immediately after sowing seeds. The number of emerged seedlings was counted daily up to complete emergence. Total stands, plant height, number of leaves, leaf chlorophyll index, plant components dry weight and leaf area were recorded three weeks after imposition of flooding treatments. In the second experiment, fifteen mungbean genotypes viz. BARImung2, VC3945A, VC6173A, VC3960-88, VC1163A, BUmungl, BUmung2, BUmung4, BARImung2, BARImung3, BARImung4, BARImung5, BARImung6, IPK2558-97, ML267 and ML613 were evaluated. Flooding treatments were no-flooding (control), 2-day, 4-day and 6-day flooding. Two-week old five plants of each genotype grown in plastic trays were flooded and flooding depth was maintained 1.5 cm above the soil surface. Both flooded and non-flooded plants were harvested at 2-weeks after termination of flooding. Data were recorded on plant height, number of leaves, components dry weight, chlorophyll index, number of root nodules.

Source of Information: Annual Report

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The production of total dry matter (TDM) decreased with the increase of flooding period. Flooding induced reduction in TDM ranged from 2-30% for 2-d flooding, 8-38% for 4-d flooding and 23-45% for 6-d flooding. The genotypes VC3945A, VC6173A, VC3960-88 and BUmungl having better root growth produced greater TDM under flooding situation indicating better tolerance to flooding. Flooding induced reduction in leaf area showed almost similar trend as that of TDM. In contrast, leaf chlorophyll content was least affected. Flooding tolerance of mungbean was associated with rapid production of root, root nodules, leaf area development and subsequent dry matter accumulation.

Knowledge Management: Report/Proceedings