Phuke Rahul M, Anuradha Kotla, Radhika Kommineni, Jabeen Farzana, Anuradha Ghanta, Ramesh Thatikunta, Hariprasanna K, Mehtre Shivaji P, Deshpande Santosh P, Anil Gaddameedi, Das Roma R, Rathore Abhishek, Hash Tom, Reddy Belum V S, Kumar Are Ashok
International Crops Research Institute for the Semi-Arid TropicsHyderabad, India.
Professor Jayashankar Telangana State Agricultural UniversityHyderbad, India.
Front Plant Sci. 2017 May 5;8:712. doi: 10.3389/fpls.2017.00712. eCollection 2017.
The low grain iron and zinc densities are well documented problems in food crops, affecting crop nutritional quality especially in cereals. Sorghum is a major source of energy and micronutrients for majority of population in Africa and central India. Understanding genetic variation, genotype × environment interaction and association between these traits is critical for development of improved cultivars with high iron and zinc. A total of 336 sorghum RILs (Recombinant Inbred Lines) were evaluated for grain iron and zinc concentration along with other agronomic traits for 2 years at three locations. The results showed that large variability exists in RIL population for both micronutrients (Iron = 10.8 to 76.4 mg kg and Zinc = 10.2 to 58.7 mg kg, across environments) and agronomic traits. Genotype × environment interaction for both micronutrients (iron and zinc) was highly significant. GGE biplots comparison for grain iron and zinc showed greater variation across environments. The results also showed that G × E was substantial for grain iron and zinc, hence wider testing needed for taking care of G × E interaction to breed micronutrient rich sorghum lines. Iron and zinc concentration showed high significant positive correlation (across environment = 0.79; < 0.01) indicating possibility of simultaneous effective selection for both the traits. The RIL population showed good variability and high heritabilities (>0.60, in individual environments) for Fe and Zn and other traits studied indicating its suitability to map QTL for iron and zinc.
粮食作物中铁和锌含量低是有充分文献记载的问题，影响作物营养品质，尤其是在谷类作物中。高粱是非洲和印度中部大多数人口的主要能量和微量营养素来源。了解这些性状的遗传变异、基因型×环境互作以及它们之间的关联对于培育高铁和高锌的改良品种至关重要。对336个高粱重组自交系（RILs）在三个地点进行了为期2年的籽粒铁和锌浓度以及其他农艺性状的评估。结果表明，RIL群体中这两种微量营养素（在不同环境下，铁含量为10.8至76.4毫克/千克，锌含量为10.2至58.7毫克/千克）和农艺性状都存在很大变异。两种微量营养素（铁和锌）的基因型×环境互作高度显著。籽粒铁和锌的GGE双标图比较显示不同环境间变异更大。结果还表明，籽粒铁和锌的G×E效应显著，因此需要更广泛的测试以考虑G×E互作，从而培育富含微量营养素的高粱品系。铁和锌浓度呈极显著正相关（在不同环境下相关系数 = 0.79；P < 0.01），表明有可能同时对这两个性状进行有效选择。RIL群体在铁、锌及其他所研究性状方面表现出良好的变异性和高遗传力（在各个环境中均>0.60），表明其适合用于定位铁和锌的QTL。
