Resistance inVicia faba toOrobanche crenata: True resistance versus hidden susceptibility

Aalders, A. J. G.; Pieters, Romuald

doi:10.1007/bf00730669

Cited by 22 publications

(8 citation statements)

References 2 publications

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“…(Cubero 1991;Rubiales et al 2002), but the favourite index for resistance to broomrape is the total number of emerged shoots per host plant (Gil et al 1987;Cubero 1991). Broomrape attack is related to the growth vigour of the host and there is a competition for resources among attachments (Aalders and Pieters 1987), thus, indices based on size and weight of broomrapes can be misleading. The lower the amount of attachments, the bigger they are, resulting in similar weights of broomrape collected on susceptible and resistant plants .…”

Section: Discussionmentioning

confidence: 99%

Search for Resistance to Crenate Broomrape (Orobanche crenata Forsk.) in Pea Germplasm

Rubiales

Moreno²,

Sillero³

2005

Genet Resour Crop Evol

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Orobanche crenata Forsk. is a major constraint for pea production in Mediterranean and East Asian countries. To solve the problem of the lack of resistance in pea cultivars, a screening for resistance was performed under field conditions in a germplasm collection of 575 accessions of Pisum sativum L. No complete resistance was found but varying levels of resistance were identified and confirmed in further field seasons and in pots experiments in the greenhouse. Resistance was quantitative resulting in a reduction in the number of emerged broomrapes per pea plant. Broomrape infection and expression of resistance proved to be highly influenced by environmental conditions. Resistance is the consequence of the combination of several resistance mechanisms preventing or hampering establishment of broomrape and/or development of established tubercles. Resistance identified could suffice to prevent broomrape damage in normal years, but might need to be implemented with other control measures in very conducive years. Resistant accessions have been crossed with pea cultivars and submitted to a breeding programme in which accumulation of levels of resistance to broomrape is a priority.

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Section: Discussionmentioning

confidence: 99%

Search for Resistance to Crenate Broomrape (Orobanche crenata Forsk.) in Pea Germplasm

Rubiales

Moreno²,

Sillero³

2005

Genet Resour Crop Evol

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“…Although this index has some drawbacks, as we will mention below, it is simple to measure while other indices are less accurate. Orobanche attack is related to the growth vigour of the host and there is a competition for resources among attachments (Aalders & Pieters, 1987), thus, indices based on size and weight of broomrapes can be misleading. The lower the amount of attachments, the bigger they are, resulting in similar weights of broomrape collected on susceptible and resistant plants (ter Borg et al, 1994).…”

Section: Resistance Indicesmentioning

confidence: 99%

Screening techniques and sources of resistance against parasitic weeds in grain legumes

et al. 2006

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A number of parasitic plants have become weeds, posing severe constraints to major crops including grain legumes. Breeding for resistance is acknowledged as the major component of an integrated control strategy. However, resistance against most parasitic weeds is difficult to access, scarce, of complex nature and of low heritability, making breeding for resistance a difficult task. As an exception, resistance against Striga gesnerioides based on a single gene has been identified in cowpea and widely exploited in breeding. In other crops, only moderate to low levels of incomplete resistance of complex inheritance against Orobanche species has been identified. This has made selection more difficult and has slowed down the breeding process, but the quantitative resistance resulting from tedious selection procedures has resulted in the release of cultivars with useful levels of incomplete resistance. Resistance is a multicomponent event, being the result of a battery of escape factors or resistance mechanisms acting at different levels of the infection process. Understanding these will help to detect existing genetic diversity for mechanisms that hamper infection. The combination of different resistance mechanisms into a single cultivar will provide durable resistance in the field. This can be facilitated by the use of in vitro screening methods that allow highly heritable resistance components to be identified, together with adoption of marker-assisted selection techniques.

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“…There is also concern about crop phytotoxicity and environmental pollution caused by chemical pesticides. The control of parasitic weeds with trap crops is by far the most economical and practical method for small‐scale commercial farming (Aalders and Pieters, 1987). The trap crops consist of nonhost plant species whose roots exude the chemical stimulant required for germination but do not allow the attachment and development of the parasitic weed.…”

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confidence: 99%

Screening of Some Cotton Varieties for Allelopathic Potential on Clover Broomrape Germination

Ma¹,

Liu²,

Dong³

et al. 2012

Agronomy Journal

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Research on the chemical basis of allelopathy has oft en been hindered by the complexity of plant and soil matrices, making it diffi cult to track active compounds. Well-designed bioassays under controlled environments can be useful in evaluating the allelopathic potential of plants. Th is paper describes two experiments about the allelopathic potential of cotton (Gossypium hirsutum L.). In the fi rst experiment, root exudates were collected from six common cotton (G. hirsutum L. and G. barbadense L.) varieties grown hydroponically. Th e cotton (donor plant) root exudates were tested on clover broomrape (Orobanche minor Smith), to determine which variety had the highest allelopathic potential. In the second experiment, the allelopathic potential of 22 soon-to-be-released cotton varieties was evaluated for clover broomrape using rhizosphere soil and extracts from diff erent plant parts. Th e results indicated that methanol was a more suitable reagent than distilled water for extracting germination stimulants from cotton plants. Th ere was a signifi cant positive correlation between the rates of clover broomrape germination in the rhizosphere soil treatments and those in the stem extract (r = 0.6018, P < 0.05) and the leaf extract treatments (r = 0.5540, P < 0.05). Th ere was also a signifi cant positive correlation between germination rates in the root extract treatments and the stem extract treatments (r = 0.7237, P < 0.05). In conclusion, the allelopathic potential of cotton can be assayed by observing the germination of clover broomrape seeds treated with cotton stem extracts.

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Resistance inVicia faba toOrobanche crenata: True resistance versus hidden susceptibility

Cited by 22 publications

References 2 publications

Search for Resistance to Crenate Broomrape (Orobanche crenata Forsk.) in Pea Germplasm

Search for Resistance to Crenate Broomrape (Orobanche crenata Forsk.) in Pea Germplasm

Screening techniques and sources of resistance against parasitic weeds in grain legumes

Screening of Some Cotton Varieties for Allelopathic Potential on Clover Broomrape Germination

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