Reference "QTL analysis for panicle characteristics in temperate japonica rice."

Reference ID

7787

Title

QTL analysis for panicle characteristics in temperate japonica rice.

Source

Euphytica, 2002, vol. 128, pp. 219-224

Authors (4)

Yamagishi-M	Takeuchi-Y
Kono-I	Yano-M

Abstract

To understand the genetic background of panicle characteristics in temperate
japonica rice (Oryza sativa L.), we genetically analyzed DH lines derived from a
cross between two temperate japonica rice cultivars, 'Akihikari' and
'Koshihikari', in 1996 and 1997. Four traits of panicle characteristics, number
of primary branches per panicle (NPB), number of secondary branches per panicle
(NSB), average number of spikelets on one primary branch (NSP) and average
number of spikelets on one secondary branch (NSS), in 212 DH lines were
measured, and the interval mapping of QTLs for these traits was carried out
using 169 DNA markers with an LOD threshold of 2.5. Five, three and one putative
QTLs for NPB, NSB and NSS were identified, respectively, and no QTLs relating to
NSP appeared. The percentages in total phenotypic variation explained by all
putative QTLs for NPB were 35.5% and 43.8% in 1996 and 1997, respectively. All
putative QTLs for NSB accounted for 35.5% and 27.5% of total phenotypic
variation in 1996 and 1997, respectively. The QTLs identified in this study will
be useful in temperate japonica rice breeding for improved spikelet yield.