Day 9, 10
Day 9, 10. The unifoliate leaves start to push past the cotyledons. Rapid cell expansion causes the stems to suddenly appear very upright. How fast the seeds start to germinate depends on light levels, moisture and temperature.
Figure 20. All nine seeds germinated. Seeds - all germinating at different rates. Image: M. E. Conley.
Figure 21. Unifoliate leaves growing past the cotyledons. A close-up view of the unifoliate leaves (arrow) emerging from the seed and growing up past the cotyledons (star). Image: M. E. Conley.
Figure 22. The first trifoliate leaf. Unifoliate leaves on either side of the first trifoliate leaf (arrow) at the stem apex. Magnified 7.9 times. Image: E. T. Paparozzi.
The main root and lateral roots continue to grow and differentiate.
Figure 23. Lateral roots. Bean main root with lateral roots. Magnified 7.9 times. Image: E. T. Paparozzi.