MONOSOMIC ANALYSIS OF FERTILITY-RESTORING GENES IN TRITICUM AESTIVUM STRAIN P168

1971 ◽  
Vol 13 (1) ◽  
pp. 14-19 ◽  
Author(s):  
Ch. M. Tahir ◽  
K. Tsunewaki
Keyword(s):  
Triticum Aestivum ◽  
Fertility Restoration ◽  
Monosomic Analysis ◽  
Modifying Genes ◽  
Restoration Mechanism ◽  
Relationship Of

Genes and chromosomes involved in fertility restoration mechanism in Triticum aestivum strain P168, an effective restorer for Aegilops ovata cytoplasm, were studied by conventional and monosomic analysis. The study revealed that chromosome 1C (or C-sat-2), which is a substitute for original chromosome 1D of Triticum aestivum var. erythrospermum, carries a dominant fertility-restoring gene, Rfc1. Chromosomes 2A, 2B, 2D, 4A, 5D and 7A of P168 were found to carry modifying genes which counteract the fertility-restoring gene, A possible homo-ancestral relationship of three fertility-restoring genes, Rf1, Rf2 and Rfc3, was suggested.

MONOSOMIC ANALYSIS OF FERTILITY RESTORATION IN THREE RESTORER LINES OF WHEAT

1969 ◽  
Vol 11 (3) ◽  
pp. 531-546 ◽  
Author(s):  
Fu-Sun Yen ◽  
L. E. Evans ◽  
E. N. Larter
Keyword(s):  
Triticum Aestivum ◽  
Fertility Restoration ◽  
Major Gene ◽  
Triticum Aestivum L ◽  
Restorer Line ◽  
Monosomic Analysis ◽  
Minor Gene ◽  
Triticum Timopheevi ◽  
Aegilops Squarrosa ◽  
A Minor

Genes conferring fertility restoration, in each of the following three hexaploid restorer lines of common wheat (Triticum aestivum L) carrying cytoplasm of Triticum timopheevi Zhuk, were located using monosomic analyses: [(T. timopheevi × Aegilops squarrosa) × Canthatch3] F7, [(T. timopheevi × Ae. squarrosa) × Dirk3] F6 and (T. timopheevi × Ae. squarrosa) × Karn3] F6.Testcross data revealed that in the Dirk restorer, a major gene (Rf1) conferring fertility restoration was carried on chromosome 1A, while a minor gene (Rf4) was located on chromosome 7D. The restorer line of Canthatch was found to carry a major gene (Rf2) and a minor gene (Rf3) on chromosomes 6B ad 6D respectively. Chromosomes 1A and 6B were found to carry genes for fertility restoration in the Karn restorer. Critical chromosomes carrying genes conferring fertility restoration in each of the three restorer lines were found not to be involved in translocations found in F1 plants of Rescue monosomics × restorer lines. Chromosomes 2A, 6A and 3D of Rescue appeared to carry genes which modified the degree of restoration obtained.

Relationship of Pre-anthesis Fructan Metabolism to Grain Numbers in Winter Wheat (Triticum aestivum L.)

1986 ◽  
Vol 13 (3) ◽  
pp. 391 ◽  
Author(s):  
JE Hendrix ◽  
JC Linden ◽  
DH Smith ◽  
CW Ross ◽  
IK Park
Keyword(s):  
Triticum Aestivum ◽  
Winter Wheat ◽  
Triticum Aestivum L ◽  
Average Degree ◽  
Grain Number ◽  
Degree Of Polymerisation ◽  
Harvest Dates ◽  
Fructan Metabolism ◽  
Relationship Of

Four cultivars of winter wheat were analysed for non-structural carbohydrates at four harvest dates starting at inflorescence initiation and ending at anthesis. Grain number was determined from comparable plants harvested at maturity. Fructose, glucose, sucrose, and fructans were quantified in extracts of stems and inflorescences. In stems the content of the four carbohydrates increased until about a week before anthesis. During the week before anthesis the trend for the sugars was variable, but fructan content continued to increase. In inflorescences, trends for sugars were similar to those in stems; however, fructan content peaked 7-10 days before anthesis. Peak quantities of fructans in inflorescences and the quantities degraded after the peak were both correlated with grain numbers. The average degree of polymerisation of fructans from stems was 5 with most being in the range from 3 to 7. The degree of polymerisation in inflorescences ranged from 3 to 56. All of these data indicate that inflorescences differ from stems in their control of fructan metabolism.

Complementary genes for reaction to Puccinia recondita tritici in Triticum aestivum. II. Cytogenetic studies

1984 ◽  
Vol 26 (6) ◽  
pp. 736-742 ◽  
Author(s):  
R. P. Singh ◽  
R. A. McIntosh
Keyword(s):  
Triticum Aestivum ◽  
Leaf Rust ◽  
Puccinia Recondita ◽  
Monosomic Analysis ◽  
Complementary Genes ◽  
Cytogenetic Studies ◽  
Puccinia Recondita Tritici

Two complementary genes, A and B, conferring resistance to Puccinia recondita tritici in various wheats were located in chromosomes 4Aβ and 3BS, respectively. In one study gene B showed recombination of 33.6 ± 4.1% with the centromere, and was independent in a second study. Gene B was the same as that designated Lr27. A new designation, Lr31, is proposed for gene A. Both Lr27 and Lr31 must be present for the expression of resistance.Key words: leaf rust, monosomic analysis, aneuploids, wheat.

A gene for resistance to a necrosis-inducing isolate of Pyrenophora tritici-repentis located on 5BL of Triticum aestivum cv. Chinese Spring

Genome ◽  
1996 ◽  
Vol 39 (3) ◽  
pp. 598-604 ◽  
Author(s):  
W. S. Stock ◽  
A. L. Brûlé-Babel ◽  
G. A. Penner
Keyword(s):  
Triticum Aestivum ◽  
Resistance Gene ◽  
Chinese Spring ◽  
Recessive Gene ◽  
Triticum Aestivum L ◽  
Tan Spot ◽  
Monosomic Analysis ◽  
Chromosome Location ◽  
Pyrenophora Tritici Repentis ◽  
Chromosome Arm

Several sources of high-level resistance to tan spot caused by Pyrenophora tritici-repentis have been identified in hexaploid wheat (Triticum aestivum L.). This study was conducted to determine the number and chromosome location of a gene(s) in the cultivar Chinese Spring (CS) that confers resistance to a tan necrosis inducing isolate (nec+chl−) of P. tritici-repentis, 86-124, and insensitivity to Ptr necrosis toxin. Reciprocal crosses were made between CS (resistant–insensitive) and 'Kenya Farmer' (KF) (susceptible–sensitive). Analysis of the CS/KF F1and F2 populations and F2-derived F3 families identified a single nuclear recessive gene governing resistance to isolate 86-124 and Ptr necrosis toxin. Evaluation of the CS(KF) substitution series, F2 monosomic analysis, and screening of a series of 19 CS compensating nullitetrasomic and two ditelosomic lines (2AS and 5BL) indicated that the resistance gene was located on chromosome arm 5BL. No linkage exists between Lr18 and the tan necrosis resistance gene on chromosome arm 5BL. It is proposed that the gene for resistance to the tan necrosis inducing isolate 86-124 (nec+chl−) of P. tritici-repentis and Ptr necrosis toxin be named tsn1. Key words : wheat, Triticum aestivum L., tan spot resistance, Pyrenophora tritici-repentis (Died.) Drechs., chromosome location, Ptr necrosis toxin.

A reciprocal backcross monosomic analysis of the scab resistant spring wheat (Triticum aestivum L.) cultivar, ?Frontana?

2007 ◽  
Vol 126 (3) ◽  
pp. 234-239 ◽  
Author(s):  
W. A. Berzonsky ◽  
B. L. Gebhard ◽  
E. Gamotin ◽  
G. D. Leach ◽  
S. Ali
Keyword(s):  
Triticum Aestivum ◽  
Spring Wheat ◽  
Triticum Aestivum L ◽  
Monosomic Analysis ◽  
Reciprocal Backcross

Relationship of indoleacetic acid and tryptophan to dormancy and preharvest sprouting of wheat

2003 ◽  
Vol 30 (9) ◽  
pp. 939 ◽  
Author(s):  
Shashi Ramaih ◽  
Mohammed Guedira ◽  
Gary M. Paulsen
Keyword(s):  
Triticum Aestivum ◽  
Abscisic Acid ◽  
Inhibitory Action ◽  
Indoleacetic Acid ◽  
Triticum Aestivum L ◽  
Preharvest Sprouting ◽  
Synthetic Auxins ◽  
Relationship Of ◽  
Related Compounds

Preharvest sprouting of wheat (Triticum aestivum L.) involves several plant hormones, but a role for indoleacetic acid (IAA) and its precursor, tryptophan, has not been demonstrated. Our objectives were to determine the roles of IAA, tryptophan, and related compounds in germination of cultivars that differed in susceptibility to preharvest sprouting. L-Tryptophan strongly inhibited germination of embryos excised from caryopses that were highly dormant at harvest but not of embryos from caryopses that had little innate dormancy. The embryos responded similarly to indoleacetaldehyde, IAA, and synthetic auxins, suggesting that tryptophan functioned as a precursor of IAA. Indoleacetaldehyde oxidase inhibitors alleviated the adverse effects of tryptophan and indoleacetaldehyde, and an auxin antagonist decreased the inhibitory action of tryptophan and IAA on embryos from dormant caryopses, further suggesting that IAA was involved. Changes in sensitivity to IAA during afterripening also supported a role for auxin in dormancy. Embryos from caryopses that were highly dormant at harvest gradually lost sensitivity to IAA during afterripening, whereas intact caryopses were insensitive to IAA. The results implicated IAA in dormancy of wheat caryopses and indicated that the auxin might complement the role of abscisic acid in germination. The importance of using dormant caryopses and arresting afterripening in investigations of seed dormancy was noted.

The transfer of stem rust resistance from the Ethiopian durum wheat St. 464 to common wheat

1996 ◽  
Vol 76 (2) ◽  
pp. 317-319 ◽  
Author(s):  
D. R. Knott
Keyword(s):  
Triticum Aestivum ◽  
Durum Wheat ◽  
Key Words ◽  
Common Wheat ◽  
Stem Rust ◽  
Rust Resistance ◽  
Triticum Turgidum ◽  
Stem Rust Resistance ◽  
Puccinia Graminis ◽  
Monosomic Analysis

Two genes for stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.) resistance were transferred from the Ethiopian durum wheat (Triticum turgidum L) accession St. 464 to Thatcher and Prelude/8* Marquis common wheat. One gene was shown by monosomic analysis to be on chromosome 4B and proved to be Sr7a. Monosomic analysis failed to locate the second gene. It is only partially dominant and conditions resistance to a range of races. Key words: Rust resistance, stem rust, wheat, Puccinia graminis tritici, Triticum aestivum, Triticum turgidum

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