Maris Piper | |
---|---|
Genus | Solanum |
Species | Solanum tuberosum |
Cultivar | 'Maris Piper' |
Breeder | H.W. Howard |
Origin | Plant Breeding Institute, Trumpington, Cambridgeshire, Britain 1956 |
Maris Piper is the most widely grown potato variety in the United Kingdom accounting for 16% of the planted area in 2014. Introduced in 1966 it was one of the first potato varieties bred to be resistant to a form of potato cyst nematode, a major pest of potato production in the UK. It has been the most widely grown variety in the UK since 1980 and is suitable for a range of uses including chips, roast potatoes and mashed potatoes.
Attempts to find resistance to the potato cyst nematode Globodera rostochiensis in wild potatoes began in 1941, when Conrad Ellenby started testing over 60 species held in the Commonwealth Potato Collection, finding that few were resistant or suitable to breed with cultivated potatoes. In a letter to Nature in 1952, Ellenby reported that by 1948 he had found four types that were resistant and could be crossed with contemporary varieties. [1] All four were the species Solanum tuberosum andigena , and one of these, CPC 1673, was the source of nematode resistance in Maris Piper. Although resistant to PCN, the wild potato produced very small tubers in the UK climate. [2]
Led by H. W. Howard, workers at the Plant Breeding Institute in Cambridge crossed the wild potato with contemporary varieties to produce a high-yielding, resistant variety. [2] CPC 1673 was backcrossed, crossed with Ulster Knight, and then crossed with a cross of Arran Cairn and Herald. [3] Arran Cairn was bred by Donald Mackelvie, the leading Scottish potato breeder in the early 20th century, [4] and Ulster Knight was bred by John Clarke, an eminent potato breeder from Antrim. [5] [6] The final cross was made in 1956, [7] but it took another ten years for the variety to be tested and multiplied before it was recommended by the National Institute of Agricultural Botany in 1966. [8] The PBI and Howard were awarded the Queen's Award for Technology in 1982 for breeding Maris Piper. [9] [10]
The first part of the variety's name came from Maris Lane in Trumpington where the Plant Breeding Institute was located. [11] By convention, the breeder got to choose the second name, with Piper chosen arbitrarily by Howard's son, although earlier, he had proposed calling it Maris Pard. [12] [13] It should not be confused with Maris Peer, another variety of potato.
The variety was the most popular in the UK by 1980, accounting for 24 % of the British potato crop in 1982, [2] 20 % in 2005 [14] and 16 % in 2014. [15] It became popular due to both its resistance to nematodes and its pleasing taste for consumers. [16]
Maris Piper has a fluffy texture and is considered an "all-rounder" potato. [17] It is widely used to make chips (French fries) [11] due to it having high dry matter [18] and low reducing sugars. [19] As well as being sold fresh, the variety is also suitable for processing into frozen or dehydrated products. [2]
It has been recommended by chefs Heston Blumenthal and Tom Kerridge for making triple cooked chips. [20] [21] In his book Perfection, Blumenthal stated they were "in a league of their own" for making roast potatoes [22] and he also considers them the best variety for mashed potatoes. [23]
Maris Piper is one of the most susceptible potato varieties to being eaten by slugs, [24] and also the bacterial disease common scab, which causes corky lesions to form on the skin. Common scab is controlled by irrigating crops just as the potatoes begin to form, requiring "perfect timing and perfect irrigation". [25]
Maris Piper was one of the first varieties with resistance to G. rostochiensis, with the H1 gene giving complete resistance to UK strains. [26] The widespread growth of Maris Piper led to the closely related G. pallida (to which Maris Piper has no resistance) becoming the main potato cyst nematode in the UK. [27] When nematodes feed on the roots, the H1 gene results in the potato roots dying, preventing the nematodes from feeding and making it likely they die or turn into males. [28] H1 is thought to encode a protein that specifically detects the product of one nematode gene during feeding, a so-called gene-for-gene relationship. [29]
Dr. Maynard Jack "Doc" Ramsay was an American entomologist noted for his efforts to track and eradicate exotic parasites carried in flowers, fruits and other cargoes arriving from overseas. He was listed in American Men of Science and Who's Who in America.
The soybean cyst nematode (SCN), Heterodera glycines, is the most devastating pest to soybean crop yields in the U.S., targeting the roots of soybean and other legume plants. When infection is severe SCNs cause stunting, yellowing, impaired canopy development, and yield loss. The symptoms caused by SCNs can go easily unrecognized by farmers—in some cases there are no warning symptoms before a loss of 40% of the yield. Due to the slight stunting and yellowing, many farmers may mistake these symptoms as environmental problems when in fact they are SCNs. Another symptom of SCNs that may affect farmers' yields is stunted roots with fewer nitrogen-fixing nodules. Due to the fact that soybean cyst nematodes can only move a few centimeters in the soil by themselves, they mostly are spread via tillage or plant transplants. This area of infection will look patchy and nonuniform making diagnosis more difficult for farmers. They can be seen in the roots of summer soybean plants if the roots are taken out very carefully and gently washed with water. The egg masses should be seen as bright white or yellow "pearls" on the roots. The later the roots are pulled the harder it will be to diagnose due to the SCNs female dying and turning a much darker color, forming a "cyst". The best way to know if a field is infected by soybean cyst nematodes is to take a soil sample to a nematologist.
Potato root nematodes or potato cyst nematodes (PCN) are 1-mm long roundworms belonging to the genus Globodera, which comprises around 12 species. They live on the roots of plants of the family Solanaceae, such as potatoes and tomatoes. PCN cause growth retardation and, at very high population densities, damage to the roots and early senescence of plants. The nematode is not indigenous to Europe but originates from the Andes. Fields are free from PCN until an introduction occurs, after which the typical patches, or hotspots, occur on the farmland. These patches can become full field infestations when unchecked. Yield reductions can average up to 60% at high population densities.
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Globodera rostochiensis, commonly known as the golden nematode, golden eelworm or yellow potato cyst nematode, is a plant pathogenic nematode. It is a pest of plants in the family Solanaceae, primarily infesting potatoes and tomatoes, as well as a variety of other root crops.
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