Kinetics of Stem Elongation in Light-Grown Tomato Plants. Responses to Different Photosynthetically Active Radiation Levels by Wild-Type and aurea Mutant Plants

摘要: — In this research, we measured the short- and long-term, stem elongation responses of wild-type aurea(au) mutant tomato plants to different photosynthetically active radiation (PAR) levels by using linear voltage transducers. Stem was continuously in green over 2.75 days, under 12 h light/12 dark photoperiods or darkness after a 6 irradiation period. There is no significant difference between pregrown at either LOO 400 μmol m−2 s−1 then exposed photoperiods. However, au there very large 100 umol m −2 continuous darkness. Total wild type appears be maximal s−1, while that with PAR s−1. Wild-type displayed PAR-dependent (in range 100-800 s−1) inhibition growth both during day night. contrast, showed fluence-rate-dependent promotion periods 10-400 Large, fast opposite changes rate light/dark dark/light transitions were present genotypes. Internode first half night always modest tomato, whereas it increased rapidly mutant. starts increase about darkness, showing typical time course escape from Pfr-mediated an end-of-day response. The role phytochrome level sensing light quantity discussed.