INRA, Institut de Recherche en Horticulture et Semences, (INRA, Agrocampus-Ovest, Université d'Angers), SFR 4207 QUASAV, F-49071 Beaucouzé, France.
Plant Biol (Stuttg). 2013 Jan;15(1):67-74. doi: 10.1111/j.1438-8677.2012.00603.x. Epub 2012 Jun 12.
Through its impact on photosynthesis and morphogenesis, light is the environmental factor that most affects plant architecture. Using light rather than chemicals to manage plant architecture could reduce the impact on the environment. However, the understanding of how light modulates plant architecture is still poor and further research is needed. To address this question, we examined the development of two rose cultivars, Rosa hybrida'Radrazz' and Rosa chinensis'Old Blush', cultivated under two light qualities. Plants were grown from one-node cuttings for 6 weeks under white or blue light at equal photosynthetic efficiencies. While plant development was totally inhibited in darkness, blue light could sustain full development from bud burst until flowering. Blue light reduced the net CO(2) assimilation rate of fully expanded leaves in both cultivars, despite increasing stomatal conductance and intercellular CO(2) concentrations. In 'Radrazz', the reduction in CO(2) assimilation under blue light was related to a decrease in photosynthetic pigment content, while in both cultivars, the chl a/b ratio increased. Surprisingly, blue light could induce the same organogenetic activity of the shoot apical meristem, growth of the metamers and flower development as white light. The normal development of rose plants under blue light reveals the strong adaptive properties of rose plants to their light environment. It also indicates that photomorphogenetic processes can all be triggered by blue wavelengths and that despite a lower assimilation rate, blue light can provide sufficient energy via photosynthesis to sustain normal growth and development in roses.
通过对光合作用和形态发生的影响，光成为影响植物结构的最重要的环境因素。利用光而不是化学物质来管理植物结构可以减少对环境的影响。然而，人们对光如何调节植物结构的理解仍然很差，需要进一步研究。为了解决这个问题，我们研究了两个玫瑰品种，杂种玫瑰（Rosa hybrida）‘Radrazz’和中国玫瑰（Rosa chinensis）‘Old Blush’，在两种光质下进行培养。植物从单节点插条生长 6 周，在白光或蓝光下具有相同的光合效率。虽然在黑暗中植物完全停止生长，但蓝光可以从萌芽到开花维持完全发育。蓝光降低了两个品种完全展开叶片的净 CO2 同化率，尽管它增加了气孔导度和细胞间 CO2 浓度。在‘Radrazz’中，蓝光下 CO2 同化的减少与光合色素含量的降低有关，而在两个品种中，chl a/b 比值增加。令人惊讶的是，蓝光可以像白光一样诱导茎尖分生组织、分生组织的生长和花的发育的相同器官发生活性。玫瑰植物在蓝光下的正常发育揭示了玫瑰植物对其光环境的强烈适应特性。这也表明光形态发生过程都可以被蓝光波长触发，并且尽管同化率较低，但蓝光可以通过光合作用提供足够的能量，以维持玫瑰的正常生长和发育。
