Growers should try anti-yellowing products that contain benzyladenine and/or gibberellins. In addition, growers who use growth retardants to keep plant growth in check may also be delaying leaf yellowing.
Member of the Solanaceae (nightshade family).
Native to North Central and South America.
Common relatives include tobacco, eggplant, petunia, pepper, butterfly-flower, Nierembergia, painted-tongue, Browallia, tomato and potato.
Species is classed as a dicotyledon, leaves not parallel veined.
Flowers tubular, flaring to five-pointed lobes, in ranked clusters at stem ends.
Stems with oval, soft leaves.
Flowers are mostly fragrant.
Nicotiana: named for Jean Nicot, 1530-1600, French counsel to Portugal, who is said to have first presented tobacco to the courts of Portugal and France.
The specific epithet name “alata” means winged, in reference to the shape of the stems.
This family has many poisonous members including the common weed, deadly nightshade, and the green skin of potatoes. On the other hand, it is a source of many commercial foods including potato, tomato, pepper and eggplant. Tobacco also is a member.
An example of a favorite cultivar and its respective flower colors is ‘Domino’ (red, picotee and more).
Recent Research Findings:
In response to a virus attack, Knoester et al. (2001) showed that the resulting ethylene production actually stimulates protective mechanisms against the virus in non-infected plant parts.