Effects of lighting method on growth and morphology of plantlets

为了提高能量和空间效率，开发了一种使用漫射光纤的原型侧向照明系统。在该系统中，只有光合有效辐射从光纤释放到幼苗。比较了侧向光照系统和常规向下光照系统下马铃薯试管苗的生长情况。在侧向光照系统中进行微繁殖的试管苗具有显著缩短的茎，同时获得增加的干重和叶面积，所有这些都是微繁殖试管苗对离体条件的驯化的优选特征。随着R/FR比的增加，马铃薯试管苗的芽长逐渐减小，采用漫射光纤和LED的侧向照明系统是一种有效控制试管苗生长和形态的照明系统。

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.