RESEARCH: SUPER DWARF
CULTIVAR STUDIES: TOMATO |
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'Micro-Tina' was developed at the University of
Florida - Bradenton, and extensively tested at Utah State University.
Micro-Tina's short height, high yield, and good flavor make it
excellent for fresh food in the space station.
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GENERAL INFO / RECOMMENDED CULTURAL CONDITIONS:
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HEIGHT:
LIFE CYCLE:
TEMPERATURE:
PPF:
PHOTOPERIOD:
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20 to 25 cm
flowering: ~ 25 days; red fruit: ~ 45
days after flowering
25 to 28 °C day;
20 to 23 °C night
200 to 1500 μmol m-2 s-1
16-h
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CLICK ON TITLES TO VIEW
ABSTRACTS:
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Temperature Effects on Ethylene Sensitivity in
Dwarf Tomatoes
Tim Hudelson, S. Klassen, and B.
Bugbee - 2003
Habitation Meeting
Jan,
2004; Orlando, FL
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ABSTRACT The sensitivity of wheat
to C2H4 appears to be influenced by
temperature. A previous study showed that yields of USU-Apogee and
USU-Perigee wheat were significantly reduced by 100 nmol mol-1
C2H4 (0.1 ppm; 100 ppb), and that
sensitivity decreased with increasing temperature (unpublished data).
This study examined C2H4-temperature
interactions in Red Robin and Micro-Tina tomatoes at 0, 10, and 30
nmol mol-1 and 22 and 28 oC. Treatments were
randomly assigned to twelve flow-through, 0.17 m2, acrylic
chambers, which were divided into equal halves for both cultivars.
The system was located in a greenhouse and received 29 mol m-2
d-1 PPF from supplemental HPS lighting and five to 12 mol m-2
d-1 PPF from sunlight. CO2 was elevated to 1200
µmol mol-1, and
temperature was maintained at +/- 1oC of the set point. C2H4
treatment began on day 18 after emergence, three days before
flowering, temperature treatment began on day 20, and both were
maintained for the duration of the study. C2H4-sensitivity
appeared to decrease more dramatically with increasing temperature for
Red Robin than for Micro-Tina. At 22 oC, Red Robin yield
in the 30 nmol mol-1 treatment was about 42% less than
control with no apparent decrease at 28oC. Micro-Tina
yield in the 30 nmol mol-1 treatment decreased by about 22%
at 22oC with no apparent decrease at 28oC. Red
Robin yield was 20 to 60% less than Micro-Tina in all treatments.
Both cultivars had 40 to 60% higher yield at 22 than at 28 oC.
These trends were similar when expressed as fruit number and dry
mass. Ground cover fraction was measured with a digital camera and
was reduced by only about 5% at 30 nmol mol-1 in both
cultivars. The C2H4 sensitivity of yield
appears to decrease with increasing temperature in both Red Robin and
Micro-Tina, but the interaction does not appear to be as dramatic in
the higher yielding Micro-Tina cultivar.
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We evaluated 4 tomato
cultivars, selected based on height ('Red Robin' and 'Micro-Tom') and
familiarity ('Pixie' and 'Reimann Philipp') for their sensitivity to
temperature. Each cultivar was grown in four 12-cm pots from seeding
to form canopies in either 30/25 or 25/20
C day/night temperature.
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Yield is
proportional to light absorption, but maximum light cannot always be
supplied to crops in either space station production settings or in
teaching situations. It is therefore important to determine how crops
grow in light-limited conditions.
‘Micro-Tom’ tomato was grown in fluorescent light under shade cloth to
provide 100, 200, and 300 umol m-2 s-1 for 16-h
photoperiods at 26/22 oC for 117 days.
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