The rubber tree (Hevea brasiliensis) is an economically important source of natural rubber. H. brasiliensis grows slowly in southern China mainly because of relatively low temperatures there. The slow growth rate delays plant propagation, so ways of increasing growth are needed. Light is important for regulating plant growth. An extended photophase is commonly used to increase plant growth and development. We studied the effects of an extended photophase, by supplemental LED night lighting, on the growth and physiology of young H. brasiliensis. Night lighting significantly increased plant height, stem diameter, and flush number. Chlorophyll a and total chlorophyll contents significantly increased, while chlorophyll b and carotenoids were unaffected. The photosynthetic parameters, nutrition status, and soluble sugar and protein contents changed little with supplemental lighting. The activities of antioxidases, including superoxide dismutase, peroxidase, and catalase, were similar in the experimental and control plants. The results showed that overnight LED lighting, in addition to solar irradiation during the daytime, could improve the rhythmic growth of H. brasiliensis without causing obvious physiological changes.

橡胶树（巴西橡胶树）是天然橡胶的重要经济来源。巴西南部H. brasiliensis生长缓慢，主要是因为那里的温度相对较低。缓慢的生长速度延缓了植物的繁殖，因此需要增加生长的方法。光线对于调节植物的生长很重要。延长的光相通常用于增加植物的生长和发育。我们研究了通过补充LED夜间照明延长的光相对巴西乳杆菌幼虫的生长和生理的影响。。夜间照明显着增加了植物的高度，茎的直径和冲洗次数。叶绿素a和总叶绿素含量显着增加，而叶绿素b和类胡萝卜素未受影响。补充光照后光合参数，营养状况以及可溶性糖和蛋白质含量变化不大。在实验植物和对照植物中，抗氧化物酶的活性（包括超氧化物歧化酶，过氧化物酶和过氧化氢酶）相似。结果表明，除了白天的日光照射外，过夜的LED照明还可以改善巴西杆菌的节律生长，而不会引起明显的生理变化。