Low-temperature tolerance and genetic potential in wheat (Triticum aestivum L.):: response to photoperiod, vernalization, and plant development
Low-temperature tolerance and genetic potential in wheat (Triticum aestivum L.):: response to photoperiod, vernalization, and plant development
复制标题
DOI：
10.1007/s00425-006-0219-y
复制
发表时间：
2006-07-01
期刊：
影响因子：
4.3
通讯作者：
Fowler, D. Brian
中科院分区：
文献类型：
--
作者：
Limin, Allen E.;Fowler, D. Brian
人们经常观察到，冬季习性类型比春季习性类型更能耐受低温。这提出了一个问题：这是由于春化基因的多效性效应，还是由于LT耐性基因与这些春化基因的连锁。在小麦(Triticum aestivum L.)的两个不同遗传背景中，利用VRN-A1和VRN-A1两个等位基因的互作近等基因系(NILs)，分别决定了小麦的春性和冬性。用来区分春化、光周期和发育对相同或接近相同的遗传背景的影响。冬季品系中的VRN-A1等位基因允许充分表达与基因型相关的LT耐性潜力。在非常耐寒的遗传背景下的冬季等位基因(VRN-A1)导致比春季等位基因高出11摄氏度，或2.4倍的LT耐受性。同样，在相同的春季习性中，短日照(SD)和长日照(LD)造成的发育延迟也不会导致LT耐受性增加8.5摄氏度或2.1倍。早期发育阶段的持续时间被证明是遗传LT耐受性潜力充分表达的基础。因此，春化基因座的多效性效应可以解释耐低温与越冬习性之间的关联，而与所提出的紧密连锁的Fr-A1或更远的Fr-A2耐LT的QTL无关。植株发育逐渐降低低温驯化能力，尤其是在主茎分生组织进入双脊生殖生长阶段后。VRN-1基因，或开花诱导途径的其他成员，被认为可能参与LT耐性抑制。
It is frequently observed that winter habit types are more low-temperature (LT) tolerant than spring habit types. This raises the question of whether this is due to pleiotropic effects of the vernalization loci or to the linkage of LT-tolerance genes to these vernalization loci. Reciprocal near-isogenic lines (NILs) for alleles at the Vrn-A1 locus, Vrn-A1 and vrn-A1, determining spring and winter habit respectively, in two diverse genetic backgrounds of wheat (Triticum aestivum L.) were used to separate the effects of vernalization, photoperiod, and development on identical, or near identical, genetic backgrounds. The vrn-A1 allele in the winter lines allowed full expression of genotype dependent LT tolerance potential. The winter allele (vrn-A1) in a very cold tolerant genetic background resulted in 11 degrees C, or a 2.4-fold, greater LT tolerance compared to the spring allele. Similarly, the delay in development caused by short-day (SD) versus long-day (LD) photoperiod in the identical spring habit NIL resulted in an 8.5 degrees C or 2.1-fold, increase in LT tolerance. The duration of time in early developmental stages was shown to underlie full expression of genetic LT-tolerance potential. Therefore, pleiotropic effects of the vernalization loci can explain the association of LT tolerance and winter habit irrespective of either the proposed closely linked Fr-A1 or the more distant Fr-A2 LT-tolerance QTLs. Plant development progressively reduced LT-acclimation ability, particularly after the main shoot meristem had advanced to the double ridge reproductive growth stage. The Vrn-1 genes, or other members of the flowering induction pathway, are discussed as possible candidates for involvement in LT-tolerance repression.