Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Somatic seedlings development in P. nigra. (A) Cotyledonary somatic embryos developed on maturation medium (after 8 weeks of culture), (B) somatic seedlings with green cotyledons and radicula, (C) somatic seedlings transferred to soil, (D) somatic seedling after growing in soil for approximately 3–4 months.
