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Genetic mapping of yield traits using ril population derived from Valencia-C X Jug-03 of peanut (Arachis hypogaea L.)

Puppala, N., Mura, J.D., Pasupuleti, J., Pandey, M.K. and Varshney, R.K.ORCID: 0000-0002-4562-9131 (2018) Genetic mapping of yield traits using ril population derived from Valencia-C X Jug-03 of peanut (Arachis hypogaea L.). In: 2018 ASA and CSSA Meeting, 4 - 7 November 2018, Baltimore, MD.


The US is the world’s third-largest producer of peanut. The production of peanut in warm environments makes the crop vulnerable to soil drying reducing yields. Transpiration efficiency (TE), biomass produced per unit of water transpired, has been characterized as an essential component yield. It is considered as a significant trait to improve the drought tolerance in peanut as it is directly related to growth and transpiration, become a priority in the breeding program. Valencia is a peanut variety contributing to <1% of the US production, majorly grown in eastern New Mexico and western Texas, challenged by drought necessitating tolerant varieties. A set of 288 Recombinant Inbred Lines (RIL’s) was derived from drought-tolerant JUG03 and drought susceptible Valencia-C. These RIL’s along with JUG03 and Valencia-c were assessed for TE under drought conditions along with other parameters such as pod yield, pod number, seed weight, seed number, total water transpired, harvest index (HI) and TE. Experiments were conducted at ICRISAT (International Crop Research Institute for Semi-Arid Tropics) using lysimetric system using randomized complete block design with four replications. Plants were subjected to drought stress treatment, imposed from 22 days after sowing in the form of intermittent stress, i.e., the plant was subjected to cycles of drying and re-watering similar to treatments applied under field conditions. A two-fold variation among RIL’s for TE under water deficit stress was observed. The histogram analysis revealed the distribution of TE among RILs indicating the polygenic character of TE. Other parameters pod yield, total water transpired, water use, pod number, seed number, seed weight and haulm weight showed significant variation among the RILs. Under water stress, yield was closely related to the HI (R2=0.73, P<0.001) while TE related directly to yield (R2=0.22, P<0.001). A significant relation of total water transpired with yield (R2=0.09, P<0.001) and TE with dry weight (R2=0.76, P<0.001) was also found. This study further requires quantitative trait loci (QTL) analysis for marker-assisted selection to select and breed efficient genotypes for improved TE.

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