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High temperature stress under changing climatic conditions affects the eggplant like other vegetables. However, heat tolerant
local germplasm of eggplant has not been identified currently. Hence, a brief research investigation was carried out to assess
the heat tolerance potential of eggplant genotypes at seedling stage. The experiment was conducted under Completely
Randomized Design (CRD), having four replications. One month old seedlings of four genotypes of eggplant (25919, Nirala,
28389 and Pak-10927) were subjected to high temperature, (45ºC/35ºC day/night) for a period of seven days. Heat stress
tolerance ability of selected genotypes was evaluated by measuring the morphological (number of leaves/plant, leaf area, root
shoot lengths, plant biomass), physiological (photosynthetic rate, stomatal conductance, rate of transpiration, water use
efficiency, chlorophyll contents) and biochemical (Superoxide dismutase, Peroxidase, Catalase) characteristics. Genotypes
exhibited considerably diverse behaviour at high temperature. Genotypes (25919 and Nirala) showed heat tolerance in all
recorded variables, while genotypes (28389 and Pak-10927) were susceptible towards heat stress. So, it can be deduced from
the findings that genotype 25919 is heat tolerant genotype and may be incorporated in vegetable breeding program in order to
produce a heat tolerant variety having great potential to cope with adverse impact of elevated temperature stress. However,
Pak-10927 genotype was found most heat sensitive among the studied genotypes
Hira Faiz, Choudhary Muhammad Ayyub, Rashad Waseem Khan, Rashid Ahmad. (2020) MORPHOLOGICAL, PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES OF EGGPLANT (Solanum melongena L.) SEEDLING TO HEAT STRESS, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 2.
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