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Quantitative trait loci associated to agronomic traits and yield components in a Sorghum bicolor L. Moench RIL population cultivated under pre-flowering drought and well-watered conditions

机译:在开花前干旱和灌溉良好的条件下种植的高粱双色L.Moench RIL群体与农艺性状和产量构成相关的数量性状基因座

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摘要

The present study aims to identify QTL influencing agronomic traits and yield components under well-watered and pre-flowering drought stress conditions. One hundred F5 recombinant inbred lines (RIL) and the parental lines of a cross between a drought-tolerant and a susceptible line in a field experiment were carried out at Nong Lam University of Ho Chi Minh City, Vietnam. Drought stress was induced by withholding irrigation water from the plants at four weeks after sowing to flowering. Leaf area of the third leaf, stem diameter, plant height, days to heading, anthesis and maturity, panicle length, number of seeds per plant, hundred kernel weight and grain yield were measured. Plants were genotyped with 117 Diversity Arrays Technology (DArT) and eight expressed sequence tag (EST)-derived simple sequence repeat (SSR) markers. Composite interval mapping was carried out on the traits and significant QTL were claimed at a logarithm of the odds (LOD) score >2.5. A total of 50 QTL were detected on nine chromosomes or 13 linkage groups, respectively. Six promising QTL regions with seven QTL for yield and agronomic traits especially related to pre-flowering drought tolerance were identified on chromosomes SBI-01, SBI-03, SBI-04, SBI-05 and SBI-07.
机译:本研究旨在确定在水分充足和开花前干旱胁迫条件下影响农艺性状和产量构成的QTL。在越南胡志明市农林大学进行了一百个F5重组近交系(RIL)以及耐旱和易感系杂交的亲本。在播种到开花后的第四个星期,通过从植物中扣留灌溉水来诱发干旱胁迫。测量第三叶的叶面积,茎直径,植物高度,抽穗天数,花序和成熟度,穗长,单株种子数,百粒重和籽粒产量。用117多样性阵列技术(DArT)和8个表达的序列标签(EST)衍生的简单序列重复(SSR)标记对植物进行基因分型。对性状进行了复合区间作图,并以赔率(LOD)得分> 2.5的对数声明了显着的QTL。在9个染色体或13个连锁组上分别检测到50个QTL。在SBI-01,SBI-03,SBI-04,SBI-05和SBI-07染色体上鉴定了六个有前途的QTL区域,其中七个具有产量和农艺性状的QTL,特别是与开花前的耐旱性有关。

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