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Effects of High Temperature on Photosynthesis and Yield in Mungbean

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

Abstract/ Executive Summary:

Temperature 36^oC at pre-flowering stage of mungbean showed lower leaf conductance than that of others. Transpiration rate was not affected by the temperature treatments. Ambient temperature showed the highest yield. Yields at the temperature 36^oC at pre-flowering, flowering and grain filling stages were identical and decreased as compared to ambient temperature. Photosynthesis decreased under high temperature.

Keywords: Photosynthesis, Temperature, Growth stage, Mungbean yield

Location: BINA, Mymensingh, Bangladesh

Start Date: 00-03-2010

End Date: 00-05-2011

Program Area: Risk Management in Agriculture

Commodity: Mungbean

Objectives:

To investigate the effects of temperature at different growth stages of eight mungbean varieties with respect to photosynthesis and yield

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, BARImung-5, Binamoog-6, Binamoog-7, Binamoog-8, BU moog- and BU moog- 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 (27^oC, (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, leaf conductance and transpiration were 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: Bangladesh J. Bot.44(3):451-454, 2015

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

High temperature (36^oC) at pre-flowering, flowering and pod filling stages decreased photosynthetic rates. High temperature at pre-flowering stage had lower leaf conductance than others. Transpiration rate was not affected by the temperature treatments. High temperature at pre-flowering, flowering and pod filling stages decreased pod weights compared to ambient. Ambient temperature showed the highest yield. Yields at high temperature (36^oC) at pre-flowering, flowering and grain filling stages were identical. Binamoog-5 produced the highest pod weight, yield plant^-1 and lower photosynthetic rate, leaf conductance and transpiration rate. Binamoog-6 showed identical yield plant^-1to Binamoog-5. BU Mung-1 had the highest photosynthetic rate, leaf conductance, transpiration rate and lower pod weight and seed yield plant^-1. BU mung-2 produced lower pod weight and yield plant^-1. BU Mung-4 and BARI mung-2 showed medium photosynthetic rate, leaf conductance, transpiration rate, pod weight and seed yield plant^-1. Binamoog-2 and Binamoog-7 had lower photosynthetic rate, transpiration rate, medium pod weight and seed yield plant^-1. Temperature 36^oC at pre-flowering stage affected photosynthesis and pod development.

Knowledge Management: Journal