Girault Tiffanie, Bergougnoux Veronique, Combes Didier, Viemont Jean-Daniel, Leduc Nathalie
Université d'Angers, UFR Sciences, UMR-462 SAGAH (Université d'Angers, INH, INRA), Angers cedex, France.
Plant Cell Environ. 2008 Nov;31(11):1534-44. doi: 10.1111/j.1365-3040.2008.01856.x. Epub 2008 Aug 22.
Light controls bud burst in many plants, which subsequently affects their architecture. Nevertheless, very little is known about this photomorphogenic process. This study ascertains the effects of light on bud burst and on two of its components, i.e. growth of preformed leaves and meristem organogenesis in six cultivars from three Rosa species (R. hybrida L., R. chinensis L., R. wichurana L.). Defoliated plants were severed above the third basal bud and exposed, either to darkness or to different intensities of white light, to blue, red or to FR, at constant temperature. Bud bursting was inhibited in darkness in the six cultivars of Rosa, but not in Arabidopsis, tomato and poplar plants under the same condition. In all Rosa cultivars, bud burst, growth of preformed leaves and meristem organogenesis were triggered by blue and red lights, and extended by increasing light intensities. FR was inhibitory of bud burst. Partial shading experiments demonstrated that bud and not stem was the active site for light perception in bud burst.
光照控制着许多植物的芽萌发，这随后会影响它们的形态结构。然而，对于这个光形态建成过程，人们了解得非常少。本研究确定了光照对三个蔷薇物种（杂种香水月季、中国月季、维丘拉月季）的六个品种的芽萌发及其两个组成部分，即已形成叶片的生长和分生组织器官发生的影响。将去叶植物在基部第三个芽上方切断，并在恒定温度下置于黑暗中或不同强度的白光、蓝光、红光或远红光下。六个蔷薇品种在黑暗中芽萌发受到抑制，但在相同条件下拟南芥、番茄和杨树植株不受影响。在所有蔷薇品种中，蓝光和红光触发芽萌发、已形成叶片的生长和分生组织器官发生，并随着光照强度增加而延长。远红光抑制芽萌发。部分遮光实验表明，在芽萌发过程中，芽而非茎是光感知的活性部位。
