Near-isogenic lines for days to heading with an Indica-type variety IR64 genetic background

Description

IR64, recognized globally as a high quality rice variety, was first released by the International Rice Research Institute (IRRI) in 1985. To increase yield potential and broaden the adaptability of IR64, a set of near-isogenic lines (NILs) of IR64 with various days to heading (DTH) were developed using Japonica-type high-yielding varieties including new plant type varieties as donor parents.
A total of five NILs were developed through marker-assisted selection. Three NILs having quantitative trait loci (QTLs) from IR65600-87-2-2-3 (IR64-NIL7) and Hoshiaoba (IR64-NIL10 and IR64-NIL11) showed earlier heading by 5 days than IR64, while two NILs from IR65598-112-2 (IR64-NIL8) and IR69125-25-3-1-1 (IR64-NIL9) showed later heading by 10 days (Table 1). Three QTLs for short DTH were detected on chromosomes 8, 6 and 11, while two QTLs for long DTH were detected on chromosomes 6 and 11 (Fig. 1 and Table 1).
These lines are the first set of NILs carrying various QTLs for DTH suitable for tropical conditions. These NILs can be used to understand the genetic basis of DTH and the effects of a single QTL/gene by testing it under different environmental conditions. Furthermore, early heading NILs could be useful for avoiding abiotic stresses at the late growth stage, while late heading NILs could be useful as breeding materials to develop high yielding lines.

Figure, table

  1. Fig.1. Graphical genotype of IR64-NIL's chromosomes which contain QTL regions for DTH(indicated by red circles) derived from donor parents
  2. Table1.Agronomic characteristics of near-isogenic lines of IR64 for days to heading
Affiliation

Japan International Research Center for Agricultural Sciences Biological Resources and Post-harvest Division

Classification

Administration A

Research project

Development of agricultural technologies in developing countries to respond to climate change

Program name

Environment and Natural Resource Management

Term of research

FY 2011 (FY 2005-FY 2011)

Responsible researcher

Kobayashi Nobuya ( Institute of Crop Science, NARO )

KAKEN Researcher No.: 70252799

Fujita Daisuke ( Institute of Crop Science, NARO )

KAKEN Researcher No.: 80721274

Ishimaru Tsutomu ( Biological Resources and Post-harvest Division )

Fukuta Yoshimichi ( Tropical Agriculture Research Front )

KAKEN Researcher No.: 40399374
MIERUKA ID: 001798

ほか
Publication, etc.

Fujita et al. (2011) Plant Breeding, 130:526-532.

Japanese PDF

2011_03_A4_ja.pdf85.07 KB

English PDF

2011_03_A4_en.pdf88.72 KB