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E.g., Wessler, regeneration, PubMed ID 17578919.

expand all sections collapse all sections  Reference "Uncovering of major genetic factors generating naturally occurring variation in heading date among Asian rice cultivars"
Reference ID 54922
Title Uncovering of major genetic factors generating naturally occurring variation in heading date among Asian rice cultivars
Source Theor Appl Genet, 2011, vol. 122, pp. -
Authors (15)
Abstract To dissect the genetic factors controlling naturally occurring variation of
heading date in Asian rice cultivars, we performed QTL analyses using F(2)
populations derived from crosses between a japonica cultivar, Koshihikari, and
each of 12 cultivars originating from various regions in Asia. These 12 diverse
cultivars varied in heading date under natural field conditions in Tsukuba,
Japan. Transgressive segregation was observed in 10 F(2) combinations. QTL
analyses using multiple crosses revealed a comprehensive series of loci involved
in natural variation in flowering time. One to four QTLs were detected in each
cross combination, and some QTLs were shared among combinations. The chromosomal
locations of these QTLs corresponded well with those detected in other studies.
The allelic effects of the QTLs varied among the cross combinations. Sequence
analysis of several previously cloned genes controlling heading date, including
Hd1, Hd3a, Hd6, RFT1, and Ghd7, identified several functional polymorphisms,
indicating that allelic variation at these loci probably contributes to
variation in heading date. Taken together, the QTL and sequencing results
indicate that a large portion of the phenotypic variation in heading date in
Asian rice cultivars could be generated by combinations of different alleles
(possibly both loss- and gain-of-function) of the QTLs detected in this study.

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