Resistance of Wheat to Leaf Spot Caused by<i>Bipolaris sorokiniana</i>

Adlakha, Kanupriya; Wilcoxson, R. D.; Raychaudhuri, S. P.

doi:10.1094/pd-68-320

Cited by 37 publications

(13 citation statements)

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“…However, in an earlier field-based study with a mixed inoculum of B. sorokiniana and Alternaria tritici, the disease resistance for HLB was reported to be dominant (Adlakha et al 1984), which contrasts with the present findings, although in a different line against a pure monoconidial HLB isolate -KL-8 and under controlled conditions.…”

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confidence: 99%

Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat

Makandar

Prabhu

Singh³

2004

Plant Breeding

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A study was conducted under controlled environment conditions in a phytotron to determine the nature of the inheritance of resistance Helminthosporium leaf blight (HLB) in a synthetic hexaploid wheat line, ÔChirya-3Õ, against the isolate KL-8 of Bipolaris sorokiniana from the major wheat growing region of India. Crosses were made between two susceptible lines ÔWH 147Õ and ÔChinese SpringÕ. Analyses of F 1 and F 2 populations of these two crosses (ÔWH 147Õ · ÔChirya-3Õ and ÔChinese SpringÕ · ÔChirya-3Õ) showed that resistance against the isolate in ÔChirya-3Õ was governed by two recessive genes functioning in a complementary interaction giving an F 2 segregation pattern of 1 : 15 (resistant : susceptible). The segregation pattern of the resistant F 2 progenies in F 3 families from both crosses confirmed that two homozygous recessive genes were responsible for resistance to the isolate of Bipolaris sorokiniana in the synthetic line ÔChirya-3Õ. It is proposed that the genes be designated as hlbr1 and hlbr2.

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contrasting

confidence: 99%

Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat

Makandar

Prabhu

Singh³

2004

Plant Breeding

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“…As many scientists working on spot blotch in wheat breeding programs have concerns regarding the best approach to score this disease in the field and how to select for resistance, we revise hereafter how to evaluate wheat materials. Several scales have been used to assess resistant materials (Hetzler, 1992;Adlakha et al, 1984;Duveiller et al, 1998b;Nagarajan and Kumar, 1998). Scales based on symptom categories that combine severity and lesion type are neither easy to use nor precise.…”

Section: Resistancementioning

confidence: 99%

“…4853Õ. Adlakha et al (1984) and Sharma and Bhatta (1999a,b) reported that spot blotch resistance was conditioned by one to three dominant genes in their research in India and Nepal respectively. In a field study in Mexico, Velazquez (1994) reported that spot blotch resistance was partially dominant, with two to three genes conditioning adult plant resistance.…”

mentioning

confidence: 99%

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

Duveiller

Sharma²

2009

Journal of Phytopathology

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Spot blotch caused by Cochliobolus sativus emerged as a major threat to wheat production in the warmer nontraditional wheat growing areas in the late 1980s. This foliar disease causes significant yield losses annually (15-20% on average in South Asia) endangering the livelihoods of millions of small farmers. Effective measures in the field are needed to mitigate the impact of spot blotch on food security in affected areas. This review summarizes the global knowledge on genetic improvement and crop management strategies to minimize yield losses based on latest field research. Recent studies have shown that spot blotch severity is highly influenced by stress factors affecting crop physiology which in turn affects host tolerance and resistance to the pathogen. Soil nutrient and water stress aggravate spot blotch-induced grain yield losses. Heat stress which is gradually increasing in Asia causes higher levels of disease damage. Genetic improvement is the cornerstone of a sustainable control of spot blotch in all affected regions. Resistance is essentially based on Chinese and South American sources and inter-specific crosses with broadly adapted semi-dwarf germplasm. A list of genotypes consistently reported in the last 10 years to harbor at least partial resistance to spot blotch, along with their inheritance of resistance, has been compiled to help breeding programmes. As the fungus is aggressive under conditions of high relative humidity and heat which in turn influences plant susceptibility, a synthesis of the different tools for scoring disease severity is given. Because resistance is incomplete, the ultimate goal is the accumulation of minor genes of resistance in adapted high yielding genotypes. This paper shows how the use of resistant varieties, timely seeding, adequate fertilization, crop rotation, and the judicious use of fungicides can be part of an integrated management strategy for controlling yield losses due to spot blotch.

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“…In certain cases, epistasis has also been reported. Adlakha et al (1984) reported that spot blotch resistance in the seedling stage was conditioned by one or two dominant genes. Srivastava et al (1971) reported that seedling resistance to spot blotch was controlled by two dominant epistatic genes.…”

Section: Introductionmentioning

confidence: 99%

Heritability estimates of spot blotch resistance and its association with other traits in spring wheat crosses

Sharma¹,

Pandey-Chhetri²,

Duveiller³

2006

Euphytica

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Resistance of Wheat to Leaf Spot Caused byBipolaris sorokiniana

Abstract: Resistance of wheat to leaf spot plants of the F 2 of each cross. The plants, caused by Bipolaris sorokiniana.

Cited by 37 publications

References 0 publications

Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat

Recessive genes controlling resistance to Helminthosporium leaf blight in synthetic hexaploid wheat

Genetic Improvement and Crop Management Strategies to Minimize Yield Losses in Warm Non‐traditional Wheat Growing Areas due to Spot Blotch Pathogen Cochliobolus sativus

Heritability estimates of spot blotch resistance and its association with other traits in spring wheat crosses

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