freising-weihenstephan sunpatiens & new guinea impatiens cold tolerance trials
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Freising-Weihenstephan SunPatiens & New Guinea Impatiens cold tolerance trials. April 2012 Garry Grueber / Cultivaris. Climate-controlled greenhouse compartments for NG/SP trials. SP/NGI trials at 12°C in temperature-controlled greenhouse compartment. SP Compact Magenta. SP Compact Orange. - PowerPoint PPT PresentationTRANSCRIPT
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Freising-WeihenstephanSunPatiens & New Guinea
Impatiens cold tolerance trialsApril 2012
Garry Grueber / Cultivaris
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Climate-controlled greenhouse compartments for NG/SP trials
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SP/NGI trials at 12°C in temperature-controlled
greenhouse compartment
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Overview of 12°C compartment, 9 cvs, 4 repetitions with 10 plants/repetition
SP Compact Orange
SP Compact Magenta
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SP Compact Magenta at 12°C – very vigorous and healthy
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SP Compact Deep Rose
SP Compact Orange
SP Compact Magenta
Overview 12°C compartment
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NGI cv at 12°C, showing stunted growth and chlorosis
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SP Compact Orange showing root development in hydroponic system at 12°C
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NGI cv showing substantially weaker root growth in hydroponic system at 12°C
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NGI cv showing leaf twisting at 12°C
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NGI cv showing stunting and leaf deformation at 12°C
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Lush growth of SP Compact Magenta at 12°C
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Stunting and chlorosis with NGI cv at 12°C
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Stunting, leaf deformation, anthocyanin influx and leaf drop with NGIs at 12°C
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Severe stunting of NGI cv at 12°C, leaf drop and botrytis infection
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SP Compact Orange grown in soil at 12°C, substantially smaller than plants grown in hydroponic system
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SP Compact Orange at 12°C in hydroponic system: substantially larger and lusher due to optimized nutrition levels
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Comparison between NGI cv (left) with SunPatiens Compact cv (right) at 12°C
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Root system of NGI cv at 12°C
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Root system of SP Compact Orange at 12°C
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SP/NGI trials at 16°C in temperature-controlled
greenhouse compartment
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Overview 16°C compartment
SP Compact Orange (significantly larger and lusher)
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Overview 16°C compartment
SP Compact Magenta
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SP Compact Deep Rose
SP Compact Magenta
Trials in 16°C compartment
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SP Compact Deep Rose at 16°C
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Root system of SP Compact Orange at 16°C
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Root system of SP Compact Orange at 16°C
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Aggressive root system of SP Compact Orange, with individual roots growing right through styrofoam
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Comparatively weaker root growth with NGI cv
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Results of climate compartment trials
• Plants were always lusher and larger in hydroponic system due to optimized nutrient availability and uptake
• Flowers and buds were constantly removed and weighed, but it was confirmed that SunPatiens were substantially earlier to flower at all temperatures.
• SunPatiens have a more aggressive and larger root system• At 12°C, SP Compact Orange and Compact Magenta had about 3
times the fresh mass of comparative NGI varieties• Compact Deep Rose is substantially smaller than Compact Orange
and Compact Magenta, especially at lower temperatures – comparable in size and performance to standard NGIs
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SP/NGI climate-chamber trialswith extreme cold stress
(8°C and 4°C, control 20°C) to induce ethane production
(instead of ethylene); goal was to see if ethane can be used as a
quick test for cold tolerance.Cold exposure: 3-4 weeks
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SP/NGI climate-chamber trialswith extreme cold stress
(8°C, after cultivation at 20°C)Cold exposure: 3-4 weeks
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Same NGI/SP assortment as in hydroponic trials
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Foliage drop and anthocyanin development at 8°C with NGI cv
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SP Compact Magenta looking good at 8°C
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Leaf twisting with NGI cv at 8°C
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Leaf drop and botrytis with NGI cv at 8°C
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SP Compact Orange looking good at 8°C
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SP Compact Orange
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What can we learn from these experiments?
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SunPatiens thrive and perform at substantially lower temperatures
than standard New Guinea Impatiens
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At all three temperature regimes, SunPatiens were quicker to
finish and quicker to flower than standard New Guinea Impatiens
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Root mass and root development is significantly stronger and fuller
with SunPatiens than with standard New Guinea Impatiens
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Nutrient uptake is significantly higher with SunPatiens than with standard New Guinea Impatiens, hence need higher fertilizer rates
for full performance
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Without hardening off, SunPatiens will also suffer from sudden exposure to really low (above-freezing) temperatures.
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Within the Compact series, there are still substantial differences in
vigor, performance and cold tolerance between cultivars
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Intense breeding and selection is needed to “true up” the Compact series and create a truly uniform,
grower-friendly series
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Most important: with SunPatiens, we have an exceptional product line that will perform extremely well under conditions that will damage and stunt competitive
lines
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Further research is needed to screen all SunPatiens varieties in
the assortment, and all future varieties in the pipeline, in regard
to cold tolerance
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Further research is also needed to compare the cold tolerance of
SunPatiens varieties with competitive lines such as
SunHarmony
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Many thanks and recognition goes to Dümmen for financing
much of the research conducted, and for allowing us to share with
the network