Identification of heterotic CMS-based rice hybrids and superior parent lines at the testcross nursery

Issue Date

7-2018

Abstract

Evaluating the performance of upcoming parent lines and its hybrids is exceptionally useful in a hybrid rice breeding program and in developing superior varieties. The study was conducted PhilRice CES. Specifically, it aimed to (a) nominate effective CMS and restorer lines, (b) measure the level of heterosis and (c) identify the heterotic hybrids generated. A total of 624 male parents and five known CMS lines were assembled. Single-crossed hybrids were generated from selected parents from different breeding ecosystems such as Tropical japonica (TJ) with 239, 18 Double Haploid lines (DH), 192 Hybrid nursery (HBC), 68 genome wide assisted selection lines (GWAS), 34 Saline (SAL), 2 Direct seeded (DS), 42 heat tolerance (HT), 15 Uniform restorer (RU), 14 irrigated lowland (IL) and five WA-CMS (IR58025A, PR15A, PR15A, PR21A, PR27A and PR19A) as testers. Hybrids and parents were evaluated for yield and yield related traits along with the inbred and hybrid checks (PSB Rc82, NSIC Rc222, Metiso 19, and Metiso 20). Analysis of variance revealed significant differences between lines, testers, and hybrids. As product of elite restorer and good CMS tester, crossed of IR58025A x TCN-694 got the highest yield of 14.3 t/ha during the 2017 DS. In wet season, cross combinations of PR15A x PR15A x PR40496-55-2-1-4 and PAR19A x PR39500-8-5-49 yielded 6t/ha and 5.5 t/ha respectively. Yield advantage ranged from 4.71% tp 29.43% over the check varieties. For parent lines, 64 restorer and 53 maintainers were nominated. Testcross performance and phenotypic acceptability showed that IR58025A, PR29A and PR15A were identified to be good combiners for dry and PR 19A for wet season. In this study, the use of diverse parental lines from different breeding programs and elite lines from improvement nurseries can contribute to the development of high yielding hybrid and good combiner parents.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463X

Volume

43

Issue

Supplement no. 1

Page

98

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Language

English

Subject

Oryza sativa;Hybrid rice

En – AGROVOC descriptors

ORYZA SATIVA; HYBRIDS; IDENTIFICATION; PROGENY; HETEROSIS; CROP PERFORMANCE

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