Identification of quantitative trait loci for seedling habit, grain color and cuticular wax from Tibetan semi-wild wheat (Triticum aestivum ssp. tibetanum)
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Authors
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Jian Ma
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Wei Luo
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Nana Qin
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Xiaohong Zhou
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Yuming Wei
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Pengfei Qi
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Qiantao Jiang
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
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Xiujin Lan
Triticeae Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang, Chengdu, Sichu.an, 611130, China
Abstract
Aiming at detecting possible potentials of Tibetan semiwild wheat in breeding programs, we have identified several
Quantitative Trait Loci (QTLs) for seedling habit, grain color
and cuticular wax that are related to stress resistance such
as cold resistance, pre-harvest sprouting and drought
resistance using recombinant inbred line population derived
from a cross between Tibetan semi-wild wheat (Q1028)
and Zhengmai 9023 (ZM9023). A total of 17 QTLs were
detected. Four QTLs were detected for seedling habits on
chromosomes 2A, 2B, 2D, 6B, explaining 4.64%-26.40% of
phenotypic variance. Of these, QTLs on chromosomes,
2A, 2B and 2D were stable across two growing years. Two
stable QTLs were detected for grain color on chromosomes,
3A and 3B explaining 7.59%-12.81% of phenotypic variance.
Five QTLs for spike wax, detected on chromosomes, 1B (2
QTLs), 2B, 2D and 5A explained 6.53%-13.20% of phenotypic
variance, while six QTLs for stem wax were detected on
chromosomes, 1A, 2B, 2D, 4A, 6A and 6B explaining 5.59%-
21.03% of phenotypic variance. The QTLs identified in this
study broadened our understanding on Tibetan semi-wild
wheat and laid the foundation for their further utilization in
breeding program in order to improve the cold resistance,
pre-harvest sprouting and drought tolerance.