Effects of lighting method on growth and morphology of plantlets

为了提高能源和空间效率，开发了一个使用扩散光纤的原型侧向照明系统。在这个系统中，只有光合有效辐射从光纤释放到植株。比较了马铃薯在侧向光照和常规向下光照条件下的幼苗生长情况。在侧向光照系统中进行微繁殖的植株茎干明显缩短，干重和叶面积增加，这些都是微繁殖植株适应离体条件的首选特征。利用红光和远红光发光二极管作为补充光源，通过改变红光(R)和远红光（FR）光子通量密度来控制植株的生长和形态。随着R/FR的增加，马铃薯植株的茎长逐渐减少。采用扩散光纤和led的侧向照明系统是一种有效控制植株生长和形态的有效照明系统。

A prototype sideward lighting system using diffusive optical fibers was developed for enhanced energy and space efficiencies. In this system, only photosynthetically active radiation is released from the optical fibers to plantlets. Growth of potato plantlets micropropagated in the sideward lighting system was compared to that in the conventional downward lighting system. Plantlets micropropagated in the sideward lighting system had significantly shortened stems while gaining increased dry weight, leaf area, all of which are preferred characteristics of micropropagated plantlets for acclimatization to ex vitro conditions.Plantlet growth and morphology were controlled by modifying red (R) and far-red (FR) photon flux densities with red and far-red light emitting diodes as supplemental light sources. Shoot length of potato plantlets decreased with increasing R/FR ratio.Sideward lighting system with diffusive optical fibers and LEDs was a usuful lighting system to effectively control the growth and morphology of plantlets in micropropagation.