Thomas J F, Raper C D
Crop Sci. 1984 May-Jun;24:611-4. doi: 10.2135/cropsci1984.0011183x002400030042x.
Soybean plants [Glycine max (L.) Merr.] of the determinate cultivar Ransom growing in controlled environments under 16-h photoperiods were exposed to 10, 12, 14, 15, and 16-h photoperiods upon expansion of either the two primaries or fifth trifoliolate leaf (V1 and V6 developmental stages, respectively) to determine the influence of plant size on sensitivity to photoperiod. Plants were sampled at 2 to 3-day intervals over a 21-day treatment period and examined microscopically for evidence of floral development. Time of floral initiation for plants exposed to photoperiod treatments at either V1 or V6 stage varied only by a few days among photoperiods, but the subsequent differentiation of floral primordia was much more rapid at shorter than at longer photoperiods. These results confirm previous observations for plants transferred upon expansion of the first trifoliolate leaf (V2 stage) and indicate that sensitivity of floral responsiveness to photoperiod changed little with plant size.
在16小时光周期的可控环境中生长的有限生长型品种兰塞姆大豆植株[大豆（Glycine max (L.) Merr.）]，在两片初生叶或第五片三出复叶展开时（分别为V1和V6发育阶段），接受10、12、14、15和16小时的光周期处理，以确定植株大小对光周期敏感性的影响。在21天的处理期内，每隔2至3天对植株进行采样，并通过显微镜检查花芽发育的证据。在V1或V6阶段接受光周期处理的植株，其花芽起始时间在不同光周期之间仅相差几天，但在较短光周期下，花芽原基的后续分化比在较长光周期下要快得多。这些结果证实了之前对在第一片三出复叶展开时（V2阶段）转移的植株的观察结果，并表明花芽对光周期的反应敏感性随植株大小变化不大。
