PROBLEM TO BE SOLVED: To provide a method for discriminating light intensity suitable for plant cultivation from observation of chloroplast motion in a cell, and a cultivation method of plants which is irradiated with blue light of light intensity discriminated by the discrimination method.SOLUTION: Light intensity suitable for plant cultivation is discriminated by a method comprising: (a) a process of preparing a plurality of plant leaves a part of which is coated by a light-shielding material (b) a process of irradiating the leaves prepared in process (a) with blue light having different light intensities and (c) a process of discriminating whether the irradiated blue light is weak light or strong light by removing a light-shielding material and observing a light-irradiating region of each leaf and chloroplast motion in a cell in a light-shielding region. Further, plants, which belong to the same family as the plant to which the discrimination was performed, is irradiated with blue light having the light intensity discriminated by the method above, and are cultivated.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】植物栽培に適した光強度を、細胞内の葉緑体運動の観察から判別する方法や、かかる判別方法によって判別した光強度の青色光を照射する植物の栽培方法を提供する。【解決手段】(a)一部を遮光材で被覆した植物の葉を複数準備する工程;(b)工程(a)で準備した葉に対し、それぞれ異なる光強度の青色光を照射する工程;(c)遮光材を除去し、それぞれの葉の光照射領域及び遮光領域における細胞内の葉緑体運動を観察することにより、照射した青色光が弱光か強光かを判別する工程;を備えた方法により、植物栽培に適した光強度を判別する。また、上記方法によって判別した光強度の青色光を、前記判別を行った植物と同じ科に属する植物に照射して栽培する。【選択図】図1
