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  • Author or Editor: Cheryl D. Zack x
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Abstract

This study evaluates light quality and photoperiodic effects on vegetative growth on Cucurbita maxima Duch. In a growth chamber with fluorescent and incandescent lighting the quality of light prior to the dark period, rather than photoperiod, significantly affected internode elongation, and end-of-day red (R) and far-red (FR) treatments demonstrated phytochrome involvement. Internode elongation occurred primarily during the dark period. FR treatments at the beginning of the dark period were most promotive, but FR up to 12 hour into a 16 hour dark period promoted internode elongation significantly. Changes in the ratio of R to FR light at sunset are probably not of sufficient duration and intensity to elicit an end-of-day growth response. In the field, changes in light quality at sunset did not alter the growth habit of the bush or bush-vine phenotypes.

Open Access

Abstract

Applications of (2-chlorothyl)phosphonic acid (ethephon) at 240 ppm in the greenhouse and at 480 ppm in the field extended the pistillate flowering stage of a gynomonoecious line of muskmelon (Cucumis melo L.). Foliar application of the aminoethoxy analog of rhizobitoxine, aminoethoxyvinyl glycine (AVG), enhanced staminate and/or perfect flower formation in the gynomonoecious line. The results support the feasibility of using gynomonoecious parents for producing hybrid muskmelons without hand pollinations.

Open Access