Genetic control of duration of pre-anthesis phases in wheat (Triticum aestivum L.) and relationships to leaf appearance, tillering, and dry matter accumulation.
Genetic control of duration of pre-anthesis phases in wheat (Triticum aestivum L.) and relationships to leaf appearance, tillering, and dry matter accumulation.
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DOI：
10.1093/jxb/err230
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发表时间：
2012-01
影响因子：
6.9
通讯作者：
Romagosa I
中科院分区：
文献类型：
--
作者：
Borràs-Gelonch G;Rebetzke GJ;Richards RA;Romagosa I
花前发育阶段的持续时间对温带谷物改良适应性和产量潜力的育种具有重要意义。然而，尽管对花（开花）时间和花起始期的遗传控制进行了大量研究，但对其他花期前阶段的遗传控制知之甚少。此外，花期前持续时间的变化对叶片外观和分蘖相关性状的影响，或对终粒萌发前干物质积累的影响，我们所知甚少。在ACT和NSW两个大田试验中，研究了两个双单倍体面包小麦群体Cranbrook×Halberd和CD87×Katepwa的叶片和小穗发育期（LS）、茎伸长期（SE）和茎伸长期（SE）的遗传控制，以及茎伸长期（SE）和茎伸长期（SE）的遗传控制。相的长度是通过测量TS和茎伸长的开始来估计的。测定了Cranbrook×Halberd群体TS前的单株干重、叶片呈现率、分蘖率、最大分蘖数和叶片数以及TS时的单株干重。与花前不同阶段的长度相比，更多的基因组区域被鉴定出来。LS与SE总体呈显著正相关，但LS与SE之间存在独立的遗传变异，且在两个群体中存在对两个阶段均有不同影响的数量性状位点（qtl）。其中几个qtl（似乎与报道的主基因不一致）可能对育种有兴趣，因为它们只对LS或SE有显著性。叶片表观率与叶片表观率无显著关系。LS与TS前的干重呈极显著正相关，与TS前的早活力呈极微负相关。尽管LS与部分分蘖性状存在显著的遗传相关性，但在不改变总开花时间的情况下，缩短LS以延长SE并不一定会降低分蘖能力，因为分蘖性状的qtl与仅LS或SE显著的qtl并不重合。因此，研究不同的花期对更好地理解调控发育时间的遗传因素具有重要意义，并可能为在适应性和产量潜力方面进行育种微调提供新的工具。
The duration of pre-anthesis developmental phases is of interest in breeding for improved adaptation and yield potential in temperate cereals. Yet despite numerous studies on the genetic control of anthesis (flowering) time and floral initiation, little is known about the genetic control of other pre-anthesis phases. Furthermore, little is known about the effect that changes in the duration of pre-anthesis phases could have on traits related to leaf appearance and tillering, or dry matter accumulation before terminal spikelet initiation (TS). The genetic control of the leaf and spikelet initiation phase (LS; from sowing to TS), the stem elongation phase (SE; from TS to anthesis), and, within the latter, from TS to flag leaf appearance and from then to anthesis, was studied in two doubled-haploid, mapping bread wheat populations, Cranbrook×Halberd and CD87×Katepwa, in two field experiments (ACT and NSW, Australia). The lengths of phases were estimated from measurements of both TS and the onset of stem elongation. Dry weight per plant before TS, rate of leaf appearance, tillering rate, maximum number of tillers and number of leaves, and dry weight per plant at TS were also estimated in the Cranbrook×Halberd population. More genomic regions were identified for the length of the different pre-anthesis phases than for total time to anthesis. Although overall genetic correlations between LS and SE were significant and positive, independent genetic variability between LS and SE, and several quantitative trait loci (QTLs) with different effects on both phases were found in the two populations. Several of these QTLs (which did not seem to coincide with reported major genes) could be of interest for breeding purposes since they were only significant for either LS or SE. There was no relationship between LS and the rate of leaf appearance. LS was strongly and positively correlated with dry weight at TS but only slightly negatively correlated with early vigour (dry weight before TS). Despite significant genetic correlations between LS and some tillering traits, shortening LS so as to lengthen SE without modifying total time to anthesis would not necessarily reduce tillering capacity, as QTLs for tillering traits did not coincide with those QTLs significant only for LS or SE. Therefore, the study of different pre-anthesis phases is relevant for a better understanding of genetic factors regulating developmental time and may offer new tools for fine-tuning it in breeding for both adaptability and yield potential.
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鉴定基因组区域确定物候发育导致小麦的花卉过渡（Triticum aestivum L.）。
影响因子：
6.9
作者：
Båga M;Fowler DB;Chibbar RN
通讯作者：
Chibbar RN
影响因子：
--
作者：
APPLEYARD, M;KIRBY, EJM;FELLOWES, G
通讯作者：
FELLOWES, G
影响因子：
5.4
作者：
GALIBA, G;QUARRIE, SA;SNAPE, JW
通讯作者：
SNAPE, JW
影响因子：
5.4
作者：
Dubcovsky, J;Lijavetzky, D;Tranquilli, G
通讯作者：
Tranquilli, G
影响因子：
2.1
作者：
HAUN, JR
通讯作者：
HAUN, JR