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  • Author or Editor: Herschel H. Klueter x
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Abstract

Seedlings of the tea crabapple (Malus hupehensis Rehd.) were started in the greenhouse for 3, 7, 9, 11, or 14 weeks and then were grown for 18 days in controlled-environment chambers. Enriching the atmosphere to 3000 ppm CO2 significantly increased height, number of nodes, and number and length of lateral shoots over those maintained at ambient CO2. The effect of CO2 enrichment on height was greater than that on node number. Although growth during 18 days of treatment was greatest on the oldest seedlings, growth on the youngest seedlings was greatest in proportion to their original size.

Open Access

Abstract

The growth of cutleaf crabapple [Malus toringoides (Rehd.) Hughes] seedlings was greatly accelerated by direct seeding under CO2-enriched atmospheres (400 or 2000 ppm) in controlled-environment chambers. CO2 treatment of 2000 ppm for 4 weeks from the time of seeding in the growth chamber produced the most striking results in terms of increase in node number and stem length. By the end of 4 weeks of treatment, stem lengths of seedlings treated for 4 weeks in the growth chamber with 2000 ppm CO2 were 3 times greater than those of plants grown at ambient CO2 (ca 350 ppm) in the greenhouse for 4 weeks, and 1.5 times greater than those treated in the growth chamber with 400 ppm CO2 for 4 weeks. The effect of CO2 enrichment on stem length was greater than that on node number. The stimulatory effects of CO2 enrichment persisted for 2-3 months after the plants were moved to the greenhouse at ambient CO2.

Open Access