Int.J.Curr.Microbiol.App.Sci (2019) 8(8): 2065-2073 2065 Original Research Article https://doi.org/10.20546/ijcmas.2019.808.241 Screening of Garden Pea Genotypes for High Temperature Tolerance Using Temperature Induction Response Technique Deven Verma 1* , T.S. Aghora 1 , Laxman Hunashikatti 2 and A.T. Sadashiva 1 1 Division of Vegetable Crops, ICAR - IIHR, Bengaluru – 560089, India 2 Division of Plant Physiology and Biochemistry, ICAR - IIHR, Bengaluru – 560089, India *Corresponding author ABSTRACT Introduction Garden pea botanically known as Pisumsativum var. Hortense, which belongs to family Fabaceae. It is cool season leguminous vegetable crop which is mainly grown as a rabi season crop in India. It is extensively grown for seeds as well as pods and it can be consumed as fresh, canned, frozen or dry seeds in different areas of the world. The optimum temperature reported for the cultivation of garden pea ranges from 15°C to 23°C with a maximum temperature of 28°C (Lambert and Linck, 1958; Nonnecke et al., 1971). They have been pretty well known for their nutritional values. Peas are an excellent source of protein, fibre, minerals and vitamins. The protein content of wrinkled-seeded pea cultivars is 26-33 % while the protein in their smooth seeded counterparts is 23-31% International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 8 Number 08 (2019) Journal homepage: http://www.ijcmas.com Garden pea is a cool season leguminous vegetable crop with a temperature requirement of 15-23°C, for its optimum growth. Thus, it is mainly grown as a rabi season crop in India. Increased CO 2 concentration in the environment has led to global warming. All the seedlings of pea lines were taken in uniformly after 48h and grown in completely randomized design (CRD) block with three replications having twenty seedlings per replication. The experiment was conducted in the laboratory of Division of Plant Physiology and Biochemistry, ICAR- Indian Institute of Horticultural Research, Bengaluru. The standardization studies using 48 h old Azad P-1 seedlings revealed that optimum lethal and induction temperature were 43°C for 3 hours and 30-38°C for 3 hours, respectively. Screening of 32 garden pea germplasm lines using TIR technique resulted in identification of 10 tolerant lines (ArkaUttam, Arka Apoorva, IIHR 544, IIHR 13-1, IIHR 680, PMR 37, Swarna Mukti, KTP 4, and VRPMR 11) with the help of normal Z-distribution. Keywords Garden pea, High temperature tolerance, TIR, Lethal temperature, Induction temperature Accepted: 15 July 2019 Available Online: 10 August 2019 Article Info