Backcross breeding in groundnut (Arachis hypogaea L.)

Jakkeral, S A and Nadaf, H L and Gowda, M V C and Bhat, R S and Motagi, B N and Mukri, G and Gangashetty, P I and Talawar, A and Kolakar, S (2014) Backcross breeding in groundnut (Arachis hypogaea L.). In: Advances in Arachis Through Genomlcs & Biotechnology (AAGB 2014), 7th International Conference of the Peanut Research Community, November 11-14, 2014, Savannah Marriott Riverfront, Savannah, Georgia, USA.

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Rust caused by Puccinia arachidis Speg. is the most serious disease of groundnut and causes substantial yield loss and reduces the fodder and seed quality. Recombinant inbred lines (F6) were generated by SSD method from cross GPBD-5 x GPBD-4 and the rust resistant plants were backcrossed to the recurrent parent (GPBD-5) to develop a backcross population (BC1F4). The objective ofthis experiment was to study the possibilities of linkage break-down between yield component traits and rust resistance in groundnut. Analysis of data revealed that there was a shift in correlation from negative (F6) to positive significant direction (BC1F4) between pod yield per plant with plant height and between plant height with number of primary branches. Similarly there was linkage break-down between negative significant to positive significant association of number of primary branches with number of pods per plant, kernel yield per plant and shelling percent at both genotypic and phenotypic levels. Altogether a desirable shift in association and the proof of broken repulsion phase linkage and release of concealed variability, which is useful in plant breeding, provides a lot of scope for selection. Unchanged negative association between pod yield per plant with reaction to rust and shelling percent in both phenotypic and genotypic level in both the populations, indicated the operation of strong linkage blocks and which requires an intensive selection to combine disease resistance with yield. Otherwise inter-mating of highly extreme segregants in the populations also would cause breakage of these stubborn linkages. Thus, for yield component traits, backcrossing of selected plants is more rewarding than the single cross and advance by single seed decent method of breeding in groundnut.

Item Type: Conference or Workshop Item (Paper)
Divisions: RP-Grain Legumes
CRP: CGIAR Research Program on Grain Legumes
Uncontrolled Keywords: Groundnut, Breeding, Peanut
Subjects: Mandate crops > Groundnut
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 16 Mar 2016 09:10
Last Modified: 07 Sep 2017 06:09
Acknowledgement: UNSPECIFIED
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