Indian Society of Genetics & Plant Breeding



Published on

A representative set of donor parents of rice with consistently high level of resistance
to different biotypes of rice gall midge, Orseolia oryzae (Wood Mason) (Diptera :
Cecidomyiidae), was crossed to T(N)I, the susceptible check and the Ft's Fz's and
F3'S along with parents were screened under glasshouse as well as field conditions
against the biotypes 1, 2 and 4 to understand the mode of inheritance of
biotype-specific resistance. Crosses were also made among the parents resistant to
different biotypes and the Ft, Fz and F3 plants were screened to study the allelic
relationships of the biotype-spedfic resistance genes. The inheritance studies revealed
a simple mode of inheritance with resistance being dominant over susceptibility.
Reciprocal combinations in selected crosses revealed no maternal influence in the
manifestation of resistance in respect of all the biotypes studied. Alleli~ relationship
studies revealed that the dominant gene governing resistance against b,iotype 1 in
Eswarakora, W 1263 and NHTA 8, desIgnated as Gm1, was nonallelic and independent
of the gene Gm3 conferring resistance in Bhumansan, Banglei and T 1432. Against
biotype 2, the gene Gm4 conferring resistance in Bhumansan is, nonallelic to the
resist~ce gene GmS, which is allelic in NHTA 8, Banglei and T 102. The dominant
resistance gene Gm6 against biotype 4 in NHTA 8 is nonallelic ~o the resistance
gene Gm7 in Banglei, T 1432 and T 1477, which is allelic in them~

Keywords: Gall midge, rice, biotype, resistance.


Year: 1997
Volume: 57
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



Download PDF