Genetic Improvement of Sorghum as a Biofuel Feedstock: I. QTL for Stem Sugar and Grain Nonstructural Carbohydrates
Genetic Improvement of Sorghum as a Biofuel Feedstock: I. QTL for Stem Sugar and Grain Nonstructural Carbohydrates
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DOI：
10.2135/cropsci2008.01.0016
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发表时间：
2008-11-01
期刊：
影响因子：
2.3
通讯作者：
Kresovich, Stephen
中科院分区：
文献类型：
--
作者：
Murray, Seth C.;Sharma, Arun;Kresovich, Stephen
高粱的遗传改良[高粱双色（L.）]Moench]传统上专注于单一的非结构性碳水化合物，谷物淀粉或茎糖。高粱淀粉和糖都可以用作生物燃料生产的原料。为了研究籽粒糖和茎糖之间的遗传权衡，以甜高粱品种里约热内卢和籽粒糖品种BTx623为材料，对籽粒糖和茎糖产量及组成相关的27个性状进行了评价。在3种环境中，共鉴定出129个数量性状位点（QTL）。籽粒糖和茎糖产量的权衡鉴定与高度和开花时间定位的QTL。最重要的是，这些QTL在没有多效性的情况下提高了产量，改变了茎糖和籽粒组成。例如，3号染色体上的QTL解释了25%的茎糖浓度遗传变异，但没有与任何谷物QTL共定位。这些结果表明，通过选择籽粒型和甜高粱的主要QTL，可以提高非结构碳水化合物的总产量。我们的结论是，改变籽粒和茎糖的遗传潜力对产量性状的影响应该比改变组成性状更大。
Genetic improvement of sorghum [Sorghum bicolor (L.) Moench] has traditionally focused on a single nonstructural carbohydrate, either grain starch or stem sugar. Sorghum starch and sugar may both be used as feedstocks for biofuel production. To investigate genetic tradeoffs between grain and stem sugar, a population derived from sweet sorghum cultivar Rio and grain sorghum 'BTx623' was evaluated for 27 traits related to grain and stem sugar yield and composition. Across three environments, a total of 129 quantitative trait loci (QTL) were identified. Tradeoffs identified between grain and stem sugar yield QTL colocalized with height and flowering time QTL. Most importantly, QTL were identified that increased yield and altered the composition of stem sugar and grain without pleiotropic effects. For example, a QTL on chromosome 3 that explained 25% of the genetic variance for stem sugar concentration did not colocalize with any grain QTL. These results suggest that total nonstructural carbohydrate yield could be increased by selecting for major QTL from both grain and sweet sorghum types. We conclude that altering grain and stem sugar genetic potential for yield traits should lead to greater feedstock improvement than altering composition traits.