Taylorson R B, Hendricks S B
Crops Research and Soil and Water Conservation Research Divisions, Agricultural Research Service, United States Department of Agriculture, Plant Industry Station, Beltsville, Maryland 20705.
Plant Physiol. 1971 May;47(5):619-22. doi: 10.1104/pp.47.5.619.
Effects of red (600 to 680 nanometers) and far red (700 to 760 nanometers) irradiances on Amaranthus retroflexus L. seeds indicate that synthesis of phytochrome in the red-absorbing form takes place in water-imbibed nongerminating seeds at 35 C. After 96 hours in darkness, conversion of about 0.10% phytochrome to the far red-absorbing form induces 50% germination. Continuous far red radiation at 35 C with an irradiance of 0.4 x 10(-10) Einsteins per square centimeter per second caused photoinactivation of phytochrome about equal to the rate of synthesis. Germination of seeds at 35 C, following far red irradiation adequate to establish the photostationary state, is enhanced by holding at 26 C for 16 minutes. Germination is unaffected relative to controls at constant temperature, if the period at 26 C precedes irradiation. The results indicate a quick response to action of phytochrome in a germination process.
红光（600至680纳米）和远红光（700至760纳米）辐照度对反枝苋种子的影响表明，在35℃下，处于吸胀未萌发状态的种子会合成吸收红光形式的光敏色素。在黑暗中放置96小时后，约0.10%的光敏色素转化为吸收远红光形式会诱导50%的种子萌发。在35℃下，以每秒每平方厘米0.4×10⁻¹⁰爱因斯坦的辐照度持续进行远红光照射，导致光敏色素的光失活速率约等于其合成速率。在远红光照射足以建立光稳态后，将种子置于26℃下保持16分钟，可提高其在35℃下的萌发率。如果在26℃下保持的时间段在照射之前，那么在恒温条件下，相对于对照，种子萌发不受影响。结果表明，在种子萌发过程中，种子对光敏色素的作用反应迅速。
