GGE biplot analysis of performance in farmers' fields, disease reaction and grain quality of bacterial leaf blight-resistant rice genotypes

Issue Date

4-2008

Abstract

The current technology of using DNA markers facilitated the pyramiding of bacterial leaf blight (BLB) resistance genes, selection and development of five elite lines three backcrosses. These DNA marker-aided selection (MAS)-derived lines were evaluated for yield and grain qualities in farmers' fields in 15 environments in 2000-2002, after inoculation with nine races of BLB pathogen in the screen house. GGE biplot analyses were conducted to identify the stable genotype for deployment as well as the suitable areas for its commercial grain production. Analysis on grain quality and disease reaction also aimed to determine donor parents for the traits and identify BLB races that will be useful in further screening for resistance. Results show AR32-19-3-3 has the best yielding line for deployment in Nueva Ecija, Baler and Eastern Samar provinces. It has the best package of resistance to all BLB races and the grain traits commonly found in IR64, the most popular quality rice in the Philippines. It is a good donor for grain quality traits such as amylose content and grain shape. GGE biplot analysis pinpointed the best in this line, thus supporting the varietal release of AR32-19-3-3 in 2006, currently called NSIC Rc142 - 'Tubigan 7.' Among the lines, AR32-4-58-2 is a good donor for high milling recovery, head rice and crude protein content. Race 6 is the best representative race for inoculation among BLB races, while races 1 and 5 are good for BLB resistance screening.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463x

Volume

33

Issue

1

Page

3-19

Document Type

Article

Frequency

tri-quarterly

Physical Description

tables, biplots

Language

English

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