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A new sterile mutant designated pollen sterile (PS) found in pickling cucumber ( Cucumis sativus  L.) is characterized by normal corolla in staminate and pistillate flowers, normal fertility in the female, and absence of pollen in otherwise normal-appearing staminate flowers. All F 1  plants from PS × male fertile (MF) sib-matings were MF, and F 2  progeny segregated 3 MF: 1 PS. Sib-matings of PS segregates with sister MF segregates produced either 1 MF: 1 PS ratios or all normal plants. Thus, PS is controlled by a single recessive gene. The PS gene is not allelic to apetalous ( ap ), but was shown to be allelic to male sterile-2 ( ms-2 ) and is designated  ms-2  PS . It was not possible to determine possible allelic relationships between  ms-2  PS  and  ms-1  because of strong male and female sterility of the available  ms-1  material. F 1  generations from gynoecious-PS and monoecious-PS crossed with monoecious, gynoecious (silver-ion treated), and hermaphroditic parents produced no PS plants and sex types did not influence PS levels in F 2  progenies, indicating it is not possible to maintain the PS mutants through crosses with different cucumber sex types. It was not possible to change the expression of PS by applying cytokinin, IAA, or GA 3 , and there were no changes in response to temperature and fertilizer treatment. Unlike gynoecy, which is responsive to some external factors, PS is unresponsive. The results suggest that the use of PS in cucumber F 1  hybrid seed production is not practical. Chemical names used: indole acetic acid (IAA), gibberellin (GA 3 ).

Characterizing a Cucumber Pollen Sterile Mutant: Inheritance, Allelism, and Response to Chemical and Environmental Factors