ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (5): 50-58. doi: 10.7668/hbnxb.20192281

Special Issue: Corn

• Crop Genetics & Breeding·Germplasm Resources·Biotechnology • Previous Articles     Next Articles

QTL Identification for Stem Diameter under Low and High Planting Densities in Maize

YI Qiang1, YANG Zebing1, TAN Jiaying1, HOU Xianbin2, LIU Yinghong3, BAI Guangxiao1, HUANG Yubi4   

  1. 1. Maize Research Institute of College of Agriculture, Guizhou University, Guiyang 550025, China;
    2. College of Agriculture and Food Engineering, Baise University, Baise 533000, China;
    3. Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, China;
    4. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
  • Received:2021-04-13 Published:2021-10-28

Abstract: Mining the loci for stem diameter(SD) under different planting densities in maize could improve maize high-density tolerance and lodging resistance. SD was measured from 301 recombinant inbred lines(RIL) derived from the cross between the maize foundation parents Ye 478 and R08 under low(57 000 plants/ha) and high(114 000 plants/ha) planting densities in Jinghong, Yunnan Province, in 2014 and 2015. Quantitative trait loci(QTL) analyses were conducted by using inclusive composite interval mapping in QTL ICIMapping V4.1. QTL and environment interaction was analyzed by using the mixed-model-based composite interval mapping(MCIM) of QTLNetwork 2.0.The results showed that the difference of parental lines indicated Ye 478 did not differ for SD between two densities, but SD in R08 significantly decreased as the plant density increased. Considerable SD variation was observed in the RIL population. The range of phenotypic variation was decreased as the plant density increased. Heritability for SD in the RIL population under high and low planting densities were 48.01%, 65.03%, respectively. Correlation analyses revealed that SD was significantly correlated with plant height, ear height, and ear weight per plant(0.29> r ≥ 0.13, P <0.01), but had no significant correlation relationship with ear tip-barrenness and barrenness rate across both densities. QTL mapping by using joint analyses across both environments detected seven minor QTL for SD, with a range from 3.68% to 6.91%, and four QTL were observed under high density, namely qSD1-1, qSD3-1, qSD4, and qSD6. Only qSD6 was found across both planting densities. None of the four QTL(qSD1-1, qSD3-1, qSD3-2, and qSD4) was presented in the previous studies regarding QTL mapping for SD. Only one pair of loci for additive and additive interaction was found under high planting density. These results suggested different genetic regulations for SD across low and high densities. Among these QTL, qSD6 was simultaneously found across both densities and in the F2:3 population from the same cross reported in the previous study. Moreover, the QTL segments stated above are well descended and transmitted from Ye 478 and its descendants, which could be used for marker-assistance selection(MAS) in maize breeding.

Key words: Maize, Stem diameter, Quantitative trait loci, High-density tolerance

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Cite this article

YI Qiang, YANG Zebing, TAN Jiaying, HOU Xianbin, LIU Yinghong, BAI Guangxiao, HUANG Yubi. QTL Identification for Stem Diameter under Low and High Planting Densities in Maize[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(5): 50-58. doi: 10.7668/hbnxb.20192281.

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