Awn primordium to tipping is the most decisive developmental phase for spikelet survival in barley
Awn primordium to tipping is the most decisive developmental phase for spikelet survival in barley
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DOI：
10.1071/fp13248
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发表时间：
2014-01-01
影响因子：
3
通讯作者：
Schnurbusch, Thorsten
中科院分区：
文献类型：
--
作者：
Alqudah, Ahmad M.;Schnurbusch, Thorsten
在小粒谷物中，籽粒产量与粒数密切相关。提高颖花存活率是提高产量的重要性状。我们调查了小穗数，小穗存活和产量相关性状在温室条件下，盆栽和土壤种植的领域条件。32个春大麦（Hordeum vulgare L.）人工解剖14份二棱和18份六棱材料，以确定在芒原基（AP）、倾翻（TIP）、抽穗和花药挤出时主秆穗（SNS）上的小穗/小花数。我们观察到二棱和六棱大麦在各个阶段和生长条件下的SNS和小穗存活率存在显着差异。这两个性状都受到高度遗传控制，重复力和广义遗传力值为0.74 - 0.93。从AP到收获的小穗存活率在二棱大麦中（~70%）比在六棱大麦中（~58%）高。小穗流产，AP后立即开始，受到负面影响，增加SNS和达到AP阶段所需的热时间。小穗减少的比例最大的时期发生在AP-TIP时期，这是小穗存活的最关键时期。AP和茎伸长结束之间的持续时间与小穗存活率和产量相关性状的相关性优于使用叶高测量估计的茎伸长持续时间。结果表明，主穗在单株产量中起重要作用。延长关键的AP-TIP阶段的长度有希望通过增加小穗发育和存活来提高产量。结果还表明，温室条件下是适当的研究性状，如阶段的持续时间和小穗存活在大麦。
In small-grain cereals, grain yield is closely associated with grain number. Improved spikelet survival is an important trait for increasing grain yield. We investigated spikelet number, spikelet survival and yield-related traits under greenhouse conditions, and pot- and soil-grown field conditions. Thirty-two spring barley (Hordeum vulgare L.) accessions (14 two- and 18 six-rowed accessions) were manually dissected to determine spikelet/floret number on the main culm spike (SNS) at awn primordium (AP), tipping (TIP), heading and anther extrusion. We observed a significant difference between two- and six-rowed barley for SNS and spikelet survival at all stages and growing conditions. Both traits were highly genetically controlled, with repeatability and broad-sense heritability values of 0.74-0.93. The rate of spikelet survival from AP to harvest was higher in two- (~70%) than in six-rowed (~58%) barley. Spikelet abortion, starting immediately after AP, was negatively affected by increased SNS and the thermal time required to reach the AP stage. The largest proportion of spikelet reduction happened during the AP-TIP phase, which was the most critical period for spikelet survival. The duration between AP and the end of stem elongation correlated better with spikelet survival and yield-related characters than the estimated duration of stem elongation using leaf height measurements. Our observations indicate that the main spike plays an important role in single-plant grain yield. Extending the length of the critical AP-TIP phase is promising for improving yield through increased spikelet development and survival. The results also demonstrate that greenhouse conditions are appropriate for studying traits such as phase duration and spikelet survival in barley.