Resistance to Russian Wheat Aphid Biotype 2 in CIMMYT Synthetic Hexaploid Wheat Lines

Synthetic hexaploid wheat (SHW) is a valuable resource for breeding because it possesses more desirable traits, such as better yield and abiotic and biotic stress tolerance than common wheat. In this study, our group developed a SHW line, named ‘SynDT’, which has markedly better characteristics than Korean bread wheat ‘Keumkang’. The SynDT line is thermotolerant as it rapidly expresses heat shock proteins under heat stress. In addition, this line exhibits resistance to leaf rust by inducing the expression of antifungal enzymes, mainly chitinase, along with the rapid and high expression of pathogen-related genes. Moreover, it possesses the favorable traits of its parent wheat lines Triticum durum #24 and Aegilops tauschii #52. Therefore, the SynDT wheat line can be used as a breeding material for improving local common wheat cultivars.

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Field Evaluation of Emmer Wheat-Derived Synthetic Hexaploid Wheat for Resistance to Russian Wheat Aphid (Homoptera: Aphididae)

Journal of Economic Entomology ◽

10.1093/jee/97.3.1065 ◽

2004 ◽

Vol 97 (3) ◽

pp. 1065-1070 ◽

Cited By ~ 14

Author(s):

J. Lage ◽

B. Skovmand ◽

S. B. Andersen

Keyword(s):

Hexaploid Wheat ◽

Field Evaluation ◽

Russian Wheat Aphid ◽

Emmer Wheat ◽

Synthetic Hexaploid Wheat ◽

Synthetic Hexaploid

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Development and Identification of Four New Synthetic Hexaploid Wheat Lines with Solid Stems

10.21203/rs.3.rs-729669/v1 ◽

2021 ◽

Author(s):

Dongyu Liang ◽

Minghu Zhang ◽

Xin Liu ◽

Hui Li ◽

Zhenjiao Jia ◽

...

Keyword(s):

Durum Wheat ◽

Hexaploid Wheat ◽

Triticum Turgidum ◽

Chromosome Doubling ◽

Aegilops Tauschii ◽

Synthetic Hexaploid Wheat ◽

Vascular Bundles ◽

Lodging Resistance ◽

Synthetic Hexaploid ◽

Wheat Lines

Abstract Stem solidness is an important agronomic trait for increasing the ability of wheat to resist lodging. In this study, four new synthetic hexaploid wheat with solid stems were developed from natural chromosome doubling of F1 hybrids between a solid-stemmed durum wheat (Triticum turgidum ssp. durum, 2n = 4x = 28, AABB) and four Aegilops tauschii (2n = 2x = 14, DD) accessions. The solid expression of the second internode at the base of the stem was stable for two synthetic hexalpoid wheat Syn-SAU-117 and Syn-SAU-119 grown in both the greenhouse and field. The lodging resistance of four synthetic solid-stem wheats is stronger than that of CS, and Syn-SAU-116 has the strongest lodging resistance, followed by Syn-SAU-119. The paraffin sections of the second internode showed that four synthetic wheat lines had large outer diameters, well-developed mechanical tissues, large number of vascular bundles, and similar anatomical characteristics with solid-stemmed durum wheat. The chromosomal composition of four synthetic hexaploid wheat was identified by FISH (fluorescence in situ hybridization) using Oligo-pSc119.2-1 and Oligo-pTa535-1. At adult stage, all four synthetic hexaploid wheat showed high resistance to mixed physiological races of stripe rust pathogen (CYR31, CYR32, CYR33, CYR34). These synthetic hexaploid wheat lines provide new materials for the improvement of common wheat.

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The influence of glume pubescence on spikelet temperature of wheat under freezing conditions

Functional Plant Biology ◽

10.1071/pp00049 ◽

2001 ◽

Vol 28 (2) ◽

pp. 141 ◽

Cited By ~ 3

Author(s):

Benoit Maes ◽

Richard M. Trethowan ◽

Matthew P. Reynolds ◽

Maarten van Ginkel ◽

Bent Skovmand

Keyword(s):

Hexaploid Wheat ◽

Solid Phase ◽

Frost Damage ◽

Flowering Plants ◽

Synthetic Hexaploid Wheat ◽

Data Logger ◽

Spring Bread Wheat ◽

Significant Temperature ◽

Synthetic Hexaploid ◽

Wheat Lines

Synthetic hexaploid wheat lines possessing pubescent glumes were observed to suffer less frost damage during flowering than non-pubescent plants, after experiencing a damaging frost in the field during April 1997. In order to test the potential advantage conferred by glume pubescence, pubescent and non-pubescent plants were selected from a collection of synthetic hexaploid wheat lines, as well as from F 4 -derived F 7 lines selected from crosses between pubescent synthetic parents and non-pubescent elite spring bread wheat lines. Comparisons of floret temperature between pubescent and non-pubescent plants were carried out in a controlled temperature chamber. Freezing was determined by the appearance of an exotherm, the point in time at which water changed from liquid to solid phase. Flowering plants grown in pots were subjected to a 6-h period of temperature change ranging from 20 to –4˚C. Floret temperature was measured using micro-thermocouples attached to a data logger. Results indicated that the temperature of pubescent florets was higher than that of their non-pubescent equivalents. Significant temperature differences between the florets of pubescent and non-pubescent plants varied between 0.25 and 0.47˚C when the floret temperature of non-pubescent plants reached 0˚C. The appearance of the exotherm was delayed by as much as 3.27 min when pubescence was present. Pubescent plants also produced a higher number of grains per spikelet compared to non-pubescent plants. These observations suggest that glume pubescence is a factor that will influence the damaging effects of frost at or following anthesis.

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