Teosinte crossing barrier1, a locus governing hybridization of teosinte with maize
Teosinte crossing barrier1, a locus governing hybridization of teosinte with maize
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DOI：
10.1007/s001220100549
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发表时间：
2001-08-01
影响因子：
5.4
通讯作者：
Kermicle, JL
中科院分区：
文献类型：
--
作者：
Evans, MMS;Kermicle, JL
一个teosinte基因或基因簇，teosinte cross Barrier1(Tcb1)，它限制与玉米的杂交能力，被定位在4号染色体上糖-1远端6厘米处。Tcb1与配子体-1基因座紧密连锁，该基因座的GA1-S等位基因存在于许多爆米花中，使其他玉米品种(Ga1)的花粉不能接受。全强度的Tcb1(阳性修饰物存在)对GA1-S和半乳糖花粉都不能接受。减弱的Tcb1(没有阳性修饰物)对Ga1-S的接受性明显高于Ga1，这表明两种不亲和性系统之间存在交叉识别。相反，纯合子GA_1-S对Tcb1和Tcb1花粉都不能接受，但杂合子GA_1-S/GA_1对Tcb1的接受程度略高于Tcb1。Tcb1/-雌体对Tcb1花粉的区别是早合子的，不会失去可存活的胚珠。当引入玉米时，Tcb1不亲和性可能有助于将一类商业品种与另一类分离开来。
A teosinte gene or gene cluster, Teosinte crossing barrier1 (Tcb1), that restricts crossability with maize mapped 6 centiMorgans distal to sugary-1 on chromosome 4. Tcb1 is loosely linked with the gametophyte-1 locus whose Ga1-s allele, present in many popcorns, confers nonreceptivity to the pollen of other maize varieties (ga1). Full-strength Tcb1 (positive modifiers present) was nonreceptive to Ga1-s as well as to gal pollen. Attenuated Tcb1 (positive modifiers absent) was detectably more receptive to Ga1-s than to ga1, suggesting cross recognition between the two systems of incompatibility. Reciprocally, homozygous Ga1-s was unreceptive both to Tcb1 and tcb1 pollen, but heterozygous Ga1-s/ga1 plants were somewhat more receptive to Tcb1 than to tcb1. Discrimination by Tcb1/- females against tcb1 pollen is prezygotic, accomplished without the loss of viable ovules. When introduced into maize, Tcb1 incompatibility may be useful for isolating one category of commercial varieties from another.