Meta‐QTL analysis and in‐silico transcriptome assessment for controlling chlorophyll traits in common wheat

Author:

Guo Kaiqi12ORCID,Chen Tao12,Zhang Peipei1,Liu Yuan12,Che Zhuo3,Shahinnia Fahimeh4,Yang Delong12

Affiliation:

1. State Key Lab of Aridland Crop Science Lanzhou 730070 China

2. College of Life Science and Technology Gansu Agricultural Univ. Lanzhou 730070 China

3. Plant Seed Master Station of Gansu Province Lanzhou 730000 China

4. Bavarian State Research Centre for Agriculture, Institute for Crop Science and Plant Breeding Freising 85354 Germany

Abstract

AbstractChlorophyll is an important plant molecule for absorbing light and transferring electrons to produce energy for photosynthesis, which has a significant impact on crop yield. To identify quantitative trait loci (QTL) controlling chlorophyll traits in wheat (Triticum aestivum L.), a comprehensive meta‐analysis of 411 original QTLs for six chlorophyll traits was performed, including the evolution of soil plant analysis development (SPAD), chlorophyll content index (CCI), chlorophyll a content (Chla), chlorophyll b content (Chlb), chlorophyll content (Chl), and ratio of chlorophyll a to b (Chla/b), derived from 41 independent experiments conducted over the past two decades. Fifty‐six consensus meta‐QTLs (MQTLs) were detected, unevenly distributed on chromosomes 1A, 1B, 2A, 2B, 2D, 3B, 3D, 4B, 4D, 5A, 5D, 6A, 6D, 7B, and 7D. The confidence interval (CI) of the identified MQTLs was 0.18 to 15.07 cM, with an average of 5.74 cM, and 3.17‐times narrower than that of the original QTLs. A total of 30 MQTLs were aligned with marker‐trait associations (MTAs) reported in genome‐wide association studies (GWAS) for chlorophyll traits in wheat. Based on MQTL‐flanking marker information and homology analyses combined with RNA‐seq data, 136 putative candidate genes were identified in MQTL regions, involved in porphyrin metabolism, photosynthesis, terpene biosynthesis, glyoxylate and dicarboxylate metabolism, and secondary metabolites. The results of this study contribute to the understanding of the genetic basis for controlling chlorophyll traits and can be used in breeding wheat with high photosynthetic efficiency.

Publisher

Wiley

Subject

Plant Science,Agronomy and Crop Science,Genetics

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