The effects of long days on reproductive growth in soybeans glycine max cultivar williams

Guiamet, J.J.; Nakayama, F.

Japanese Journal of Crop Science 53(1): 35-40


Accession: 006665035

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Soybean plants cv. Williams grown under short days (SD: 9 h exposure to sunlight) since stage V2 were subjected to the following treatments: A-SD from R1 up to the end of the experiment; B-long days (LD: 9 h exposure to sunlight plus 3 hours of low intensity illumination in the middle of the dark period) from R1 up to the end of the experiment; C-LD from R1 to R5; D-LD from R5 to R6; E-LD from R6 up to the end of the experiment; F-LD from R5 up to the end of the experiment. All plants were harvested when those in treatment A reached R7. Growth of the main stem apex was prolonged in treatments B and C. Fruit set was also enhanced in these treatments; both number of nodes bearing fruits and number of fruits per fruiting node were increased. Seed number in B, C and D was higher than in SD-controls (A). At harvest, plants in treatment B exhibited the greatest stem, petiole and laminae dry weight, and specific leaf weight (SLW). In C, D and F dry weight of petioles and laminae and SLW were greater than in treatment A. Average seed weight decreased under LD, this effect being greater in treatment B. Mean seed growth rates were diminished under long-day treatments. Pod maturation and leaf senescence were delayed in B, C, D and F.