Search Results
You are looking at 1 - 2 of 2 items for
- Author or Editor: George W. Woodbury x
Abstract
Three onion varieties ‘Texas Grano’, ‘Early Yellow Globe’ and ‘Utah Yellow Sweet Spanish’ were grown in the greenhouse to investigate the effect of fluorescent and incandescent light on bulbing. Two temperature regimes were employed.
Bulbing occurred in all 3 onion varieties when incandescent light was used to supplement natural daylight and extend the photoperiod to 16 hr daily. No bulbing occurred when fluorescent light was used in a like manner. One-hour fluorescent light treatment following 15-hr incandescent light did not reverse the bulbing response. Likewise, 1-hr incandescent light treatment following 15-hr fluorescent light did not enhance bulbing. The bulbing response in each light treatment was similar in both temperature regimes.
‘Texas Grano’ bulbed and matured more rapidly than ‘Utah Yellow Sweet Spanish’. ‘Early Yellow Globe’ was intermediate in rate of bulbing and maturity when compared to the other 2 varieties.
Abstract
Onion pollen of 2 different parents, B12115C and B2215C, was collected at 9:00 am and 2:30 pm from flowers at approximately 1, 3, and 6 days after anthesis. This was germinated in hanging drops of a sucrose-gelatin medium. The percentage of pollen germination from B12115C was significantly higher than the percentage from B2215C. There was no significant difference in germination between pollen collected and germinated in the morning versus pollen collected and germinated in the afternoon. The results also show a linear relationship between pollen age and pollen germination. The ability to germinate declined rapidly after the first day and approached zero by the sixth day after anthesis. Hand pollination and style studies indicate that onion pollen tubes are capable of growing the entire length of the style, a distance of approximately 4 mm, in 24 hr.