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在番茄育种中,抗烟草花叶病毒(TMV)是重要的育种目标之一。这一抗性是受遗传基因控制的,在杂种后代中表现为显性遗传。控制番茄TMV抗性的基因主要有TM_1、TM—2和TM~(2a)等3个,其中TM—2和TM~(2a)的抗病性比TM_1高得多。TM—2基因位于第9染色体的22位点上,它和植株黄化、生长缓慢的隐性基因nv呈紧密的连锁遗传,一般把这种与nv基因连锁的TM—2写成TM~(-2nv)。这给番茄TM~(-2nv)基因的转育和进一步利用提供了有利的条件。
In tomato breeding, anti-tobacco mosaic virus (TMV) is one of the important breeding goals. This resistance is genetically controlled and appears dominant in hybrid offspring. There are three TM_1, TM-2 and TM_ (2a) genes controlling tomato TMV resistance, of which TM-2 and TM ~ (2a) are much more resistant than TM_1. The TM-2 gene is located at the 22nd site of chromosome 9, which is closely linked with plant yellowing and slowly growing recessive gene nv. TM-2, which is linked to nv gene, is generally written as TM ~ (- 2nv). This provided advantageous conditions for tomato TM ~ (-2nv) gene transfer and further utilization.