Effect of Temperature at Reproductive Growth Stage on Soybean Seedling Shoot and Root Morphology of the Offspring.

Understanding how the environmental factors affect on seed production is the key to having a greater quality seeds and a successful crop in the next season. An experiment was conducted in sunlit control environmental facilities to understand the effect of temperature on soybean offspring. Seeds from two soybean [Glycine max L.] cultivars were grown in wide range of day/night temperature regimes, 21/13, 25/17, 29/21, 33/25 and 37/29°C from initiation of flowering to harvest. Complete Random Design with three factors applied for the experiment. Then the seeds collected from these temperatures were exposed to five day night temperatures 20/12, 25/17, 30/22, 35/27, and 40/32 °C 10 days after planting (DAP). Plants were harvested 24 DAP. Morphological traits including shoot and root and physiological parameters were measured either before or during the harvest. The results indicated that temperature and cultivars affected on most the parameters significantly. The parent temperature treatments (PTT) were affected significantly on most of soybean offspring seedling morphological and physiological parameters. PTT 25/17 °C gave highest leaf area, leaf dry weight, stem dry weight, root dry weight, plant dry weight, and root volume and it was significantly different with other PTT; however, PTT 37/29 °C gave the lowest plant height, leaf number on main stem, leaf area, leaf dry weight, stem dry weight, root dry weight, plant dry weight, and root volume. This documentation will be useful to improve soybean seed production for seed purpose, and will be useful to improve the crop management practices during the production season.