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  • Author or Editor: G. E. Tolla x
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Abstract

Silver nitrate and gibberellin A4/A7 (GA4/7) were compared for induction of staminate flower production on an inbred gynoecious cucumber (Cucumis sativus L.) line grown in the field at Madison, Wisconsin. Foliar sprays of silver nitrate at 100, 200, and 400 ppm induced significantly more staminate flowers per plant than did GA4/7 at the standard, widely-used rate of 50 ppm, making gynoecious x gynoecious hybrid seed production commercially feasible. The strong induction all plants treated with silver nitrate should minimize the genetic shift toward maleness observed from one generation to the next when GA is used to increase seed of gynoecious parental lines.

Open Access

Abstract

Aminoethoxyvinylglycine (AVG) at 50,100, and 200 ppm induced staminate flowers on 3 gynoecious cucumber lines in the greenhouse. Both the time of application and the type of water used to prepare the AVG solutions had a significant effect on the node at which conversion from pistillate to staminate first occurred and on the total number of nodes bearing staminate flowers. Plants treated with 100 and 200 ppm AVG were chlorotic for about 10 days after application.

Open Access

Abstract

Silver nitrate at 100, 200 and 400 ppm and aminoethoxyvinylglycine (AVG) at 50, 100 and 200 ppm induced perfect flowers on gynoecious muskmelon (Cucumis melo L. cv. MSU-1G) in the greenhouse. Some phytotoxicity was observed in plants treated with AgNO3 and AVG at the higher concentrations.

Open Access

Abstract

Cucumber (cucumis sativus L.) hybrids from crosses with 3 female (gynoecious) parents and 2 genetically similar male parents were evaluated at 3 locations to determine if bisexual (phenotypically andromonoecious) parents can be used in hybrid cultivars with no loss in yield or quality. Bisexual parents developed through 8 backcrosses to recurrent gynoecious lines produced hybrids that could not be distinguished from those obtained by using silver nitrate-induced, near-isogenic gynoecious pollen parents. Yield, fruit shape, defects, brining quality, and sex expression of hybrids from the 2 near-isogenic pollen parents were not significantly different. Deficiencies generally attributed to bisexual parents were corrected with adequate backcrossing to establishing bisexual lines.

Open Access

Abstract

The M/m locus in cucumber (Cucumis sativus L.) controls the development of pistillate (M/m) vs. perfect (m/m) flowers. However, the F1 between 2 perfect-flowered lines, one derived from ‘Crystal Apple’ and the other derived from a Polish breeding line, had pistillate flowers suggesting the presence of another locus, M-2, acting in a complementary manner. In F2, BC, F3, and F2BC populations, bacterial wilt resistance was used as a linked genetic marker to distinguish between the m/m plants which were resistant to bacterial wilt and the m-2/m-2 plants which were susceptible to bacterial wilt. Analysis of segregating generations confirmed complementary gene action between 2 very closely linked genes, M/m and M-2/m-2, both of which are tightly linked to the gene for bacterial wilt resistance.

Open Access

Abstract

Details are provided for construction of an extractor to be used in recovering seed from cucumber fruit (Cucumis sativus L.). The extractor is best-suited for handling seed lots from areas of less than one hectare, but having more than 25 to 50 fruit. The machine handles about 100 fruit per minute and recovers 98% of the seed that would be extracted by hand.

Open Access