A single recessive gene for resistance to the root-knot nematode (Meloidogyne javanica) in Cucumis sativus var. hardwickii

Article Abstract:

The resistance to the root-knot nematode, Meloidogyne javanica, is determined by a recessive gene, mj, in Cucumis sativus var. hardwickii. A cross between the resistant LJ 90430 and the susceptible Sumter produces the susceptible F(sub 1) offsprings, which give a segregation ratio of 1 resistant: 3 susceptible in the F(sub 2) generation. The resistance remains unaffected by cytoplasmic or maternal effects. Cross between LJ 90430 and five cucumber inbred lines indicates that the inheritance of resistance is unaffected by genetic background.

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Yellow tip: a cytoplasmically inherited trait in melon (Cucumis melo L.)

Article Abstract:

The mutation in a melon chlorophyll-deficient mutant is a cytoplasmically inherited trait. The mutant is named yellow-tip and is symbolized by cyt-Yt. The mutant has yellow apices and the leaves and stems turn greener with maturity. A study of the cytoplasmic inheritance for the chlorophyll-deficient phenotype reveals that the plants in the F(sub 1), F(sub 2), and BC(sub 1) generations have the mutant phenotype when the female parent carries the mutation. The plants have green tops when the female is Top Mark.

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Inheritance of resistance in smooth bromegrass to the crown rust fungus

Article Abstract:

A new study investigates the inheritance of resistance to the crown rust fungus of smooth bromegrass.

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