Malaysian Applied Biology Journal

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Malays. Appl. Biol. (1997) 26(2): 7-12



Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221 005, India


The effect of one, two and three generations of backcrossing was studied in nine intervarietal crosses of wheat with respect to their crop maturity duration, grain yield and yield components. In 'Late x Early' crosses, the F,'s were observed to be closer to the late parent, while in 'Early x Late' crosses, they were quite close to the early maturing parent. The change in days to heading, grain yield and its components varied from cross to cross depending on the genetic background of the recurrent parent. Desirable progenies having higher yield with shorter maturity duration were noticed in BC, and BC,, generations. It indicated that 2-3 backcrossings could be successfully used for combining shorter maturity duration with better grain yield by using commercial cultivated genotypes as parents.


Kesan generasi pertama, kedua dan ketiga kacukanbalik telah dikaji dalam sembilan pengacukan antara varieti gandum telah diteliti dari segi tempon matang, hasil dan komponen hasil. Bagi kacukan 'Late x Early', Fl didapati sangat hampir dengan induk akhir, sementara 'Early x Late', didapati sangat hampir dengan induk matang awal. Perubahan bilangan hari 'heading' dan komponennya berubah di antara kacukan bergantung kepada latarbelakang genetik induk semasa. Progeni yang mempunyai hasil yang tinggi dengan tempoh matang singkat dicerap pada generasi BC, dan BC,. Ini menunjukkan yang 2-3 kali kacukbalik boleh digunakan untuk mendapat tempoh kematangan singkat dengan hasil yang baik dengan menggunakan genotip komersial sebagai induk.

Key words: Backcrossing, intervarietal crosses, non-recurrent parent, T. aestivum, transgressive segregants, yield components


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