高浓度CO_2对三种澳大利亚园林植物插条的影响

INFLUENCE OF CO_2 ENRICHMENT ON ROOTING OF THREE AUSTRALIAN ORNAMENTAL PLANTS

在繁殖棚内昼夜施放ＣＯ２，使棚内ＣＯ２浓度保持在８００±１００μｌＬ－１，对三种澳大利亚园林植物：Ｃｈａｍｅｌａｕｃｉｕｍｕｎｃｉｎａｔｕｍ、Ｃｏｒｒｅａｒｅｆｌｅｘａ和Ｐｒｏｓｔａｎｔｈｅｒａｉｎｃｔｓａ进行插条试验。结果表明：高浓度ＣＯ２处理的Ｃｈａｍｅｌａｕｃｉｕｍｕｎｃｉｎａｔｕｍ和Ｃｏｒｒｅａｒｅｆｌｅｘａ插条干物质重量和淀粉含量显著增加，使插条出根早、出根率高和根量多，据后４０ｄ的插条出根率分别比对照高２６．６％和３３．４％．然而，同样的ＣＯ２处理对Ｐｒｏｓｔａｎｔｈｅｒａｉｎｃｉｓａ的插条没有明显影响。这可能是由于后者对ＣＯ２处理不敏感之故。

Cuttings of Chamelaucium umcinatum and Correa reflexa in the plastic chamber enriched with CO2 both day and night at an average level of 800μl L-1 showed a significant increase of dry weight and starch content.In comparison with control,the short time of recovering of starch content to initial level and a progressive rise of starch content in high CO2 treated cuttings resulted in the earlier rooting, higher rooting percentage and more roots. After cutting for 40 days,the rooting rates of the CO2 enriched cuttings of Chamelaucium uncinatum and Correa reflexa were respectively 26.6% and 33.4% higher than that of the controls.However,the effect of CO2 enrichment on cuttings of Prostanthera was inconspicuous,probably because these cuttings were insensitive to CO2 treatment.