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Sex‐independent transmission ratio distortion system responsible for reproductive barriers between Asian and African rice species
Author(s) -
Koide Yohei,
Onishi Kazumitsu,
Nishimoto Daisuke,
Baruah Akhil Ranjan,
Kanazawa Akira,
Sano Yoshio
Publication year - 2008
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2008.02490.x
Subject(s) - biology , sex ratio , distortion (music) , transmission (telecommunications) , botany , ecology , evolutionary biology , demography , telecommunications , computer science , amplifier , population , bandwidth (computing) , sociology
Summary• A sex‐independent transmission ratio distortion ( si TRD) system detected in the interspecific cross in rice was analyzed in order to understand its significance in reproductive barriers. The S 1 gene, derived from African rice Oryza glaberrima , induced preferential abortion of both male and female gametes possessing its allelic alternative (), from Asian rice O. sativa , only in the heterozygote. • The si TRD was characterized by resolving it into m TRD and f TRD occurring through male and female gametes, respectively, cytological analysis of gametophyte development, and mapping of the S 1 locus using near‐isogenic lines. The allelic distribution of the S 1 locus in Asian and African rice species complexes was also analyzed. • The si TRD system involved at least two components affecting male and female gametogeneses, respectively, including a modifier(s) that enhances f TRD. The chromosomal location of the major component causing the m TRD was delimited within an approx. 40 kb region. The S 1 locus induced hybrid sterility in any pairwise combination between Asian and African rice species complexes. • The allelic state of the S 1 locus has diverged between Asian and African rice species complexes, suggesting that the TRD system has a significant role in the reproductive barriers in rice.