Studies on the environmental control for the mass propagation of the cutting seedlings.

本研究探讨了促进插穗苗木试管苗试管苗生根和生长的环境调控措施。人们认为促进光合作用很重要，因为插条碳水化合物的产生速度会影响根和地上部的生根和生长。为此，以月季和菊花为试材，研究了CO_2浓度增加对插条生根和生长的影响。结果表明：(1)增施CO_2对月季和菊花根系生长的影响：增施CO_2使月季和菊花的根干重增加1.4~2.0倍，是不施CO_2时的1.4~2.0倍。增施CO_2促进插条根系生长。(2)增施CO_2对新梢生长有促进作用。(3)增施CO_2对插穗生长有促进作用。根的生长随插条叶的增加而增加，而对新梢的生长则随插条叶的增加而抑制。(4)生根促进剂对插穗生长的影响生根促进剂处理促进根的生长。但生根促进剂处理对新梢生长有明显的抑制作用。而在富CO_2条件下，生根促进剂处理对新梢生长的抑制作用有所减弱，因此认为增施CO_2是促进根和新梢生长的有效环境调控方法。

In this study, the environmental control to promote the rooting and the growth of a root and a shoot of a cutting seedling in the mass propagation was discussed. It is thought a promotion of the photosynthesis is important because the production rate of the carbohydrate of a cutting affects the rooting and the growth of a root and a shoot. Therefore, the effects of CO_2 enrichment on the rooting and the growth of cuttings were tested with the rose and chrysanthemum which were usually propagated by vegetative propagation. The effects of the number of leaflets (leaf area) of a cutting on the rooting and the growth of a root were also tested.(1) Effect of CO_2 enrichment on the root growthThe dry weights increase of a root of the rose and chrysanthemum under CO_2 enriched condition were 1.4-2.0 times greater than those under CO_2 non-enriched condition. CO_2 enrichment promoted the growth of root of a cutting.(2) Effect of CO_2 enrichment on the shoot growthCO_2 enrichment promoted also the growth of a newly shoot.(3) Effect of the number of leaflets (leaf area) on the growth of cuttingThe growth of a root was promoted with the increasing of the leaflets of a cutting, however the growth of a newly shoot was suppressed with the increasing of the leaflets of a cutting.(4) Effect of a rooting accelerator on the growth of a cuttingThe growth of a root was promoted with the rooting accelerator treatment, however the growth of a newly shoot was suppressed considerably with the rooting accelerator treatment. However the suppression of the growth of a newly shoot with the rooting accelerator treatment was decreased under CO_2 enriched condition.As the results, it is thought that CO_2 enrichment was effective environmental control method to promote the growth of a root and a newly shoot.