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

本研究探讨了在扦插繁殖过程中促进扦插苗生根和根、梢生长的环境控制。人们认为促进光合作用是很重要的，因为切割的碳水化合物的生产速度影响生根和根和芽的生长。因此，以玫瑰和菊花为材料，研究了CO_2富集对扦插生根和扦插生长的影响。还研究了扦插的小叶数（叶面积）对扦插生根和根系生长的影响。(1) CO_2富集对根系生长的影响：CO_2富集条件下玫瑰和菊花根系的干重增加量是CO_2未富集条件下的1.4 ~ 2.0倍。CO_2富集有利于扦插根的生长。(2) CO_2富集对新梢生长的影响CO_2富集对新梢生长也有促进作用。(3)小叶数（叶面积）对扦插生长的影响随着扦插小叶数的增加，根的生长得到促进，而随着扦插小叶数的增加，新梢的生长受到抑制。(4)生根促进剂对插枝生长的影响：生根促进剂对根的生长有促进作用，但对新梢的生长有抑制作用。而在CO_2富集条件下，生根促进剂对新梢生长的抑制作用有所减弱。结果表明，CO_2富集是促进根和新梢生长的有效环境控制方法。

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.