Growth Responses of Long-Juvenile Soybean Near-Isoline Pairs to Different Spectral Balances of Reflected Light

摘要

In 1979, Hartwig and Kiihl reported a trait in PI 159925 soybean that delayed flowering under short-day conditions. The trait has been incorporated into temperate soybean germplasm and termed "long-juvenile" (Hinson, 1989). In addition to the photoperiodic response, Tomkins et al. (1994) reported that the long-juvenile (LJ) trait may also be influenced by red (R) and far red (FR) light quality components based on research conducted in a growth chamber environment. Natural sunlight, however, also contains a blue (B) light component that modulates the R/FR phytochrome response. One approach to manipulating the spectral characteristics of natural sunlight is the use of various reflective surfaces (Decoteau et al., 1988; Hunt et al., 1989; Decoteau et al., 1990). Therefore, a greenhouse study was performed using LJ soybean near-isoline pairs grown under natural light conditions with contrasting reflective light treatments to provide different spectral balances of R, FR, and B light.