Jhitpiti, a traditional gall midge resistant accession from Rice Germplasm
of lndira Gandhi Agricultural University, Raipur, Madhya Pradesh, India
was investigated for the resistance. Jhitpiti was crossed with susceptible
parents (Kranti and TN1) and with parents possessing known genes for resistance
during wet season of 1999. Half of the F1 seeds were grown
in dry season of 2000 to produce F2 seeds. F2 populations
along with F1's and parents were field screened during wet
season of 2000.
The test populations were flanked on both sides with purple colored highly
susceptible line R 2270 and artificial light during night was provided
as additional measure to attract the insects. Observations were recorded
when susceptible parents developed 100 percent infestation on per plant
basis. Presence of single silver shoot was taken as an index of susceptibility.
The natural infestation of gall midge in wet season of 2000 was very high.
Hundred percent infestation was observed on all the plants of susceptible
check and no damage was observed in the resistant cultivars (Table 1).
The F1 plants of Jhitpiti with susceptible parents Kranti and
TN1 showed resistant reaction and the F2 populations segregated
in a ratio of 3R:1S, indicating that a single dominant gene governs resistance
in Jhitpiti (Table 1).
The F2 populations from crosses of Jhitpiti with parents possessing
known dominant genes for resistance; Gm1 (Samridhi), Gm2
(Phalguna) ( Chaudhary et al. 1986) and Gm4 (Abhaya) (Shrivastava
et al. 1993), Gm5 (ARC 5984) (Kumar et al. 1998),
Gm7 (RP2333-156-8) (Kumar et al. 1999) segregated into 15R:1S
ratio in F2. The F2 population from the cross of
Jhitpiti with the RP2068-18-3-5, the donor for the recessive resistant
gene, gm3 (Kumar et al. 1998) segregated in 13R:3S ratio
in F2 (Table 2). Gene Gm6 for gall midge resistance
gene identified in rice variety Duokang 1 from China (Yang et al.
1997) is susceptible to gall midge biotype 1 of India. This clearly indicated
that the gene for gall midge resistance Jhitpiti is non-allelic to Gm1,
Gm2 gm3 , Gm4, Gm5, Gm6, and Gm7.
Therefore, this gene is designated as Gm8(t).
This study is a part of Rockefeller Foundation supported project "Identification
of new gene(s) for gall midge resistance" to Indira Gandhi Agricultural
University, Raipur, Madhya Pradesh, INDIA.
Chaudhary, B.P. P.S. Shrivastava, M.N. Shrivastava and G.S. Khush, 1986.
Inheritance of resistance to gall midge in some cultivars of rice. Paper
presented at International Rice Genetics Symposium, May 27 -31. International
Rice Research Institute, Los Banos, Laguna, Philippines.
Kumar, A., M.N. Shrivastava and R.K. Sahu, 1998. Genetic analysis of ARC
5984 for gall midge resistance -a reconsideration. RGN 15:142-143.
Kumar, Arvind, M.N. Shrivastava and B.C. Shukla, 1999. A new gene for
resistance to gall midge in rice cultivar RP2333-156-8. RGN 16:
Shrivastava, M.N., A. Kumar, S.K. Shrivastava and R.K. Sahu, 1993. A new
gene for resistance to gall midge in rice variety Abhaya. RGN 10:
Zhang, Y., Y. Tan, B. Huang, J. Chen, L. Zhao, Y. Xu, Z. Xudong, Q. Qian
and Z. Dali, 1997. The inheritance of resistance to gall midge in Duokang
1 of rice variety. RGN 14: 67-69.