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Photosynthesis, Dry Matter Partitioning and Yield in Mungbean Under High Temperature

Dr. Md. Tariqul Islam
Principal Scientific Officer and Head
Crop Physiology Division, Bangladesh Institute of Nuclear Agriculture, BAU Campus, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Experiments were conducted to evaluate summer mungbean genotypes during March to May 2010 and 2011 at BINA, Mymensingh, Bangladesh. Eight mungbean varieties viz. Binamoog-2, Binamoog-5, Binamoog-6, Binamoog-7, BARImung-2, BU mung-1, BU mung-2 and BU mung-4 were used in this study. Temperature treatments viz., (i) Ambient, (ii) 36^oC at pre-flowering, (iii) 36^oC at flowering and (iv) 36^oC at pod filling stages of mungbean varieties. Temperature 36^oC was imposed for 7 days in controlled plant growth chamber (RH 80%, CO₂ 330 ppm). The experiment was laid out in a Complete Randomized design with three replications. Temperature 36^oC at pre-flowering, flowering and pod filling stages decreased photosynthetic rates. Temperature 36^oC at pre-flowering stage showed lower leaf conductance than others. Transpiration rate was not affected by the temperature treatments. The highest dry matter/plant was found at ambient and the lowest with the temperature 36^oC at flowering stage. Ambient temperature showed the highest yield. Yields at the temperature 36^oC at pre-flowering, flowering and grain filling stages were identical.

Keywords: Photosynthesis, Temperature, Growth stage, Mungbean yield

Location: Bangladesh Institute of Nuclear Agriculture, Mymensingh

Start Date: 01-03-2010

End Date: 31-05-2011

Program Area: Variety and Species

Commodity: Mungbean

Objectives:

The objectives of the study were to assess the effects of temperature at different growth stages of mungbean varieties on yield and yield attributes and to find out temperature tolerant variety.

Methodology:

Two pot experiments were conducted to evaluate summer mungbean genotypes during March to May 2010 and 2011 at BINA, Mymensingh, Bangladesh. Eight mungbean varieties viz. Binamoog-2, Binamoog-5, Binamoog-6, Binamoog-7, BARImung-2, BU mung-1, BU mung-2 and BU mung-4 were used in this study. Each pot contained 8 Kg of soils (Silty loam, organic matter 1.05%, total N 0.07%, available P 14.3 ppm, exchangeable K 0.25 meq.per 100g soil, available S 13.2 and soil pH 6.67). The experiment was laid out in a Complete Randomized design with three replications. Recommended doses of fertilizers were applied and other cultural practices were followed as and when required. Temperature treatments viz., (i) Ambient, (ii) 36^oC at pre-flowering, (iii) 36^oC at flowering and (iv) 36^oC at pod filling stages of mungbean varieties. Temperature 36^oC was imposed for 7 days in controlled plant growth chamber (RH 80%, CO₂ 330 ppm). Ambient temperature was recorded 27-32^oC during pre-flowering, flowering and maturity stages of mungbean varieties. Photosynthesis was recorded using Portable Photosynthesis System LI-6400XT, LI-COR Inc., Lincoln, NE, USA. Partitioning of dry matter and yield attributes were taken at maturity. Statistical analysis was done as per design used with the help of MSTAT computer packages. Duncan’s Multiple Range Test (DMRT) compared the means at 5% level of significance.

Source of Information: BINA Annual report, BINA, 2010-2011: 70-72, Mymensingh

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Temperature 36^oC at pre-flowering, flowering and pod filling stages of mungbean varieties decreased photosynthetic rates. Temperature 36^oC at pre-flowering stage showed lower leaf conductance than others. Transpiration rate was not affected by the temperature treatments. The highest dry matter/plant was found at ambient and the lowest with the temperature 36^oC at flowering stage. Ambient temperature showed the highest yield. Yields at the temperature 36^oC at pre-flowering, flowering and grain filling stages were identical.

Knowledge Management: Report/Proceedings