Search tips
Search criteria 


Logo of tarabidbookLink to Publisher's site
Arabidopsis Book. 2012; 10: e0147.
Published online 2012 January 31. doi:  10.1199/tab.0147
PMCID: PMC3350170



As photoautotrophs, plants are exquisitely sensitive to their light environment. Light affects many developmental and physiological responses throughout plants' life histories. The focus of this chapter is on light effects during the crucial period of time between seed germination and the development of the first true leaves. During this time, the seedling must determine the appropriate mode of action to best achieve photosynthetic and eventual reproductive success. Light exposure triggers several major developmental and physiological events. These include: growth inhibition and differentiation of the embryonic stem (hypocotyl); maturation of the embryonic leaves (cotyledons); and establishment and activation of the stem cell population in the shoot and root apical meristems. Recent studies have linked a number of photoreceptors, transcription factors, and phytohormones to each of these events.

Articles from The Arabidopsis Book are provided here courtesy of American Society of Plant Biologists