Reference "Mapping quantitative trait loci associated with days to flowering and photoperiod sensitivity in rice (Oryza sativa L.)"

Reference ID

7892

Title

Mapping quantitative trait loci associated with days to flowering and photoperiod sensitivity in rice (Oryza sativa L.)

Source

Molecular Breeding, 2000, vol. 6, pp. 145-155

Authors (4)

Maheswaran-M	Huang-N
Sreerangasamy-S-R	McCouch-S-R

Abstract

This study was undertaken to identify putative quantitative trait loci (QTLs)
associated with days to flowering (DTF) and photoperiod response in rice. A
population of 143 recombinant inbred lines derived from a cross between CO39 and
Moroberekan was grown under greenhouse conditions and exposed to two different
photoperiod regimes. DTF of individual plants was evaluated under 10 h and 14 h
day lengths, and loci associated with photoperiod sensitivity were identified
based on the delay in flowering under the 14 h photoperiod (DTF at 14 h minus
DTF at 10 h). An RFLP data set consisting of 127 markers provided the basis for
the QTL analysis. Both single marker and interval analysis were used and
interactions between putative QTLs were estimated based on two-way ANOVA. Out of
15 QTLs associated with DTF, only 4 were identified as influencing the response
to photoperiod. Interactions between flowering QTLs indicated the complex nature
of the control of flowering in rice. The effectiveness of using a single
recombinant inbred population to study a variety of complex phenotypes is
discussed in relation to practical plant breeding.