小麦矮秆种质SN224的鉴定及农艺性状QTL分析

doi:10.3724/SP.J.1006.2016.01134

Abstract

Abstract:

SN224 is a dwarfing wheat line derived from a cross between hexaploid triticale (AABBRR, 2n = 6x) and common wheat (AABBDD, 2n = 6x). We evaluated its cytologic characteristic and main agronomic characters, and analyzed the genetic basis of dwarfing trait in order to use the germplasm in wheat breeding program.This white grain wheat had compact plant type, spindle-shaped panicle and moderate resistance to powdery mildew (Blumeria graminis f. sp. tritici, Bgt) and stripe rust (Puccinia striiformis f. sp. tritici, Pst). There were 42 chromosomes in root tip cells, showing 21 bivalents in pollen mother cells. FISH confirmed that SN224 was a 1BL·1RS translocation line. The plant height was between two parents of F₁from a cross between SN224 and Huixianhong and distributed continuously and normally in F₂ population. The detection of specific molecular marker for genes Rht-B1b, Rht-D1b, and Rht8 indicated that this line had none of the three dwarfing genes. In the meantime, the introduction of 1RS had no obvious effect on plant height. The F₂ population was used to construct a genetic linkage map containing 134 SSR markers which covered a total length of 1332.1 cM. Two major dwarfing QTLs on chromosomes 1B and 4B were detected by additive-inclusive composite interval mapping (ICIM-ADD). QPh1B and QPh4B, located in Xwmc719–Xgwm18 and Xgwm368–Xmag4284 intervals, explained 20.0% and 10.2% of phenotypic variation, respectively. Seven QTLs controlling ear length, panicle number per plant, and kernel number per spike were detected. The QTL in KSUM062–Xmag4284 interval contributed to decrease plant height, increase ear length and panicle number per plant.

Key words: Common wheat–rye translocation line, Agronomic traits, Cytological identification, QTL mapping, Dwarfing gene

WANG Xin,MA Ying-Xue,YANG Yang,WANG Dan-Feng,YIN Hui-Juan,WANG Hong-Gang. Identification of Dwarfing Wheat Germplasm SN224 and Analysis of QTLs for Its Agronomic Characters[J].Acta Agron Sin, 2016, 42(08): 1134-1142.

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Identification of Dwarfing Wheat Germplasm SN224 and Analysis of QTLs for Its Agronomic Characters

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