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Genetics of resistance to powdery mildew race 2 in muskmelon National Institute of Agronomic Research
Bohn, G.W.; Whitaker, Thomas W..
The cv. PMR45 and PMR450 of muskmelon (Cucumis melo L.) have the dominant gene Pm1 for resistance to cucurbit powdery mildew race 1, but they are susceptible to race 2. F1 hybrids from crosses of 8 race 2-resistant parents with PMR 45 were intermediate-resistant, but they resembled the resistant, rather than the susceptible, parents. Segregation in F2 and back-cross families indicated a partly dominant gene for resistance, Pm². Segregation in F2 progenies of family 3 and progenies from back-crosses to P3, the most resistant parent, indicated that 2 modifiers, in addition to Pm², differentiated extreme resistance. The modifiers were epistatic to Pm², but hypostatic to pm².
Tipo: Journal Article-postprint Palavras-chave: MUSKMELON; CUCUMIS MELO; POWDERY MILDEW; FUNGUS; RESISTANCE; GENETICS; MELON; CUCUMIS MELO; OIDIUM; CHAMPIGNON PHYTOPATHOGENE; RESISTANCE; GENETIQUE.
Ano: 1964 URL: http://hdl.handle.net/2174/477
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Nectarless, a yield-reducing mutant character in the muskmelon National Institute of Agronomic Research
Bohn, Guy Weston; Mann, Louis K..
The nectarless character in muskmelons first attracted attention in certain breeding lines in which blooms tied for pollination failed to become moist with nectar. The dry nectary itself, which is found in both staminate and perfect flowers, is smaller than a normal nectary. It is flat-topped in staminate flowers. A large portion of the nectar-producing tissue consists of collapsed cells and, in contrast to that of normal nectaries, con tains little starch before anthesis and produces little or no nectar after anthesis. Honeybees avoid nectarless flowers, especially in extensive plantings and in locations where other food sources are abundant. As a result, in contrast to normal plants, fruit set on nectarless plants is reduced and delayed.
Tipo: Journal Article-postprint Palavras-chave: MUSK MELON; CUCUMIS MELO; CUCURBITACEAE; NECTARY; NETARLESS; DRY NETRARY; YIELD; MELON CANTALOUP; NECTAIRE; NECTAIRE SEC; RENDEMENT.
Ano: 1960 URL: http://hdl.handle.net/2174/340
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Suppressive effect of the root-knot nematode on Fusarium wilt of muskmelons IRD
Orion, D; Netzer, D..
Tipo: Text Palavras-chave: NEMATODE PHYTOPARASITE; INTERACTION; MELOIDOGYNE; FUSARIUM; CUCUMIS MELO.
Ano: 1981 URL: http://www.documentation.ird.fr/hor/fdi:00463
Registros recuperados: 3
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