Original scientific paper

EFFECT OF PHOTOPERIOD, CULTIVAR AND NUMBER OF LATERAL SHOOTS ON VEGETATIVE GROWTH AND FLOWERING OF POINSETTIA

Kristina BATELJA ; Institute for Adriatic Crops Split
Smiljana GORETA BAN ; Institute for Adriatic Crops Split
Gvozden DUMIČIĆ ; Institute for Adriatic Crops Split
Slavko PERICA ; Institute for Adriatic Crops Split

Abstract

The effects of photoperiod and number of lateral shoots on vegetative
growth, number of open central clusters, and percentage of fully colored
bracts in five poinsettia cultivars were studied. The cultivars were grown at
three different photoperiods; under short-day period (SD, 9 h) long-day (LD,
13 h) and natural day (ND, 11-h day length from the 15th to the 31st of Oct.;
10-h day length from the 1st to the 15th of Nov.; 9.5-h day length from the
15th to the 30th of Nov.; 9-h day length from the 1st to the 15th of Dec.).
Vegetative growth was affected by cultivar but not by photoperiod or the
number of laterals. Short-day conditions generally enhanced the opening of
central cluster. Differences among cultivars were spotted in percentage of
bract coloration and were greater under natural- and long-day treatments than
under short-day treatment. Also in the time required for flower initiation and
development, differences among cultivars were probably the reason for
variations in bract coloration under same day-length conditions.

Keywords

day length; poinsettia cultivars; vegetative growth

Hrčak ID:

47794

URI

https://hrcak.srce.hr/47794

Publication date:

14.10.2009.

Article data in other languages: croatian

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