State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, the Chinese Academy of Sciences, Beijing 100101, China.
J Integr Plant Biol. 2014 Jun;56(6):594-604. doi: 10.1111/jipb.12174. Epub 2014 Mar 30.
Growth light intensities largely determine photosynthesis, biomass, and grain yield of cereal crops. To explore the genetic basis of light responses of biomass and photosynthetic parameters in wheat (Triticum aestivum L.), a quantitative trait locus (QTL) analysis was carried out in a doubled haploid (DH) population grown in low light (LL), medium light (ML), and high light (HL), respectively. The results showed that the wheat seedlings grown in HL produced more biomass with lower total chlorophyll content (Chl), carotenoid content, and maximum photochemical efficiency of photosystem II (Fv/Fm) while the wheat seedlings grown in LL produced less biomass with higher Chl compared with those grown in ML. In total, 48 QTLs were identified to be associated with the investigated parameters in relation to growth light intensities. These QTLs were mapped to 15 chromosomes which individually explained 6.3%-36.0% of the phenotypic variance, of which chromosomes 3A, 1D, and 6B were specifically involved in LL response, 5D and 7A specifically involved in ML response, and 4B specifically involved in HL response. Several light-responsive QTLs were co-located with QTLs for photosynthetic parameters, biomass, and grain weight under various conditions which may provide new hints to uncover the genetic control of photosynthesis, biomass, and grain weight.
生长光强在很大程度上决定了谷类作物的光合作用、生物量和籽粒产量。为了探索小麦（Triticum aestivum L.）生物量和光合参数对光响应的遗传基础，在分别生长于低光（LL）、中光（ML）和高光（HL）的双单倍体（DH）群体中进行了数量性状位点（QTL）分析。结果表明，与 ML 相比，HL 中生长的小麦幼苗具有更高的生物量，而总叶绿素（Chl）、类胡萝卜素含量和光系统 II 的最大光化学效率（Fv/Fm）较低；而 LL 中生长的小麦幼苗的 Chl 含量较高，生物量较低。总共鉴定出 48 个与生长光强有关的参数相关的 QTL。这些 QTL 被映射到 15 条染色体上，每条染色体分别解释了 6.3%-36.0%的表型方差，其中染色体 3A、1D 和 6B 特异性地参与了 LL 响应，5D 和 7A 特异性地参与了 ML 响应，4B 特异性地参与了 HL 响应。一些对光响应的 QTL 与不同条件下光合参数、生物量和粒重的 QTL 共定位，这可能为揭示光合作用、生物量和粒重的遗传控制提供新的线索。
