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Genetics of Resistance of Rice Cultivar Arc 10550 to Bangladesh Brown Plant Hopper Biotype

GURDEV S KHUSH
International Rice Research Institute, P. O. Box 933, Manila, Philippines

A N M REZAUL KARIM*
*Bangladesh Rice Research Institute, Joydebpur, Dhaka, Bangladesh

E R ANGELES
International Rice Research Institute, P. O. Box 933, Manila, Philippines

Abstract/ Executive Summary:

Resistance to brown planthopper in rice cultivar ARC 10550 was found to be governed by a single recessive gene which was designated BPH. It conveys resistance to brown planthopper populations in South Asia but not to the populations in East and Southeast Asia. This gene was segregated independently of four other known genes for brown planthopper resistance. It should be possible to combine this gene with any of the other four genes to develop rice cultivars with a broad spectrum of resistance.

Keywords: Nilaparvata lugens Stal; Oryza sativa L.; Recessive gene; Independent segregation.

Location: In Bangladesh

Start Date:

End Date:

Program Area: Pest Management

Commodity: Rice, Genetic resistant, Insects

Objectives:

The BPH populations in South Asia have been variously referred to as the South Asian biotype (Khush 1977) or biotype 4 (Khush 1984). This study was undertaken to determine the genetic basis of resistance to biotype 4 (Bangladesh population) of BPH,

Methodology:

Rice cultivars used in the study and their reactions to different biotypes are listed. A Northeast India cultivar ARC 10550, which is susceptible to biotypes 1, 2 and 3 but resistant to biotype 4, was crossed with TNI, which is susceptible to all the known biotypes of BPH. The F1, F2, and F3 populations were tested for reactions to biotype t at IRRI, Los Banos, Philippines, and to biotype 4 at the Bangladesh Rice Research Institute (BRRI), Joydebpur, Bangladesh.

For allele tests, ARC 10550 was crossed with IRt539-823, IRl154-243, Rathu Heenati, and Babawee. F1, F2, and F3 populations were tested for reaction to biotype 1 at BRRI and for reaction to biotype 4 at BRRI. The same set of F3 lines of two crosses (IRI539-823/ARCt0550 and IRl154-243/ARCI0550) was tested for reaction to biotypes 1 and 4 to determine the independence of the two genes involved. All the crosses were made at IRrU and F 1 and F z populations were also grown at IRRI Part of the seed of FI and F2 populations and each of the F3 lines was used for tests against biotype 4 at IRRI and part was tested at BRRI.

Athwal et al 1971, was employed for evaluating the reaction of parents, F₁ hybrids, and segregating populations. F1 populations and F3 lines were scored on a row basis and were classified as resistant, susceptible, or segregating. Each seedling of the F2 populations was classified as resistant or susceptible. Scoring was done when the seedlings of the susceptible control were killed.

Source of Information: J. Genet., Vol. 64, Nos. 2 & 3, December 1985, pp. 121-125.

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The data also show that BPH 5 segregates independently of Bph 1, BPH 2 and BPH 3. Since Bph 3 and BPH 4 are tightly linked, it is assumed that BPH 5 is independent of BPH 4. It should be possible to combine BPH 5 with either of the other genes in future rice varieties to gain a wider spectrum of resistance. This new gene should be particularly useful in developing resistant varieties for Bangladesh, India, and Sri Lanka. Numerous other varieties with resistance to biotype 4 have been identified. We are analyzing more varieties genetically to identify additional genes for resistance to biotype 4.

Knowledge Management: Journal