Essentiality of boron for symbiotic dinitrogen fixation in pea (Pisum sativum) rhizobium nodules. - Bolanos, ,L.,.; Esteban, ,E.,.; Delorenzo, ,C.,.; Fernandezpascual, ,M.,.; Defelipe, ,M..R.,.; Garate, ,A.,.; and Bonilla, ,I.. (Plant Physiol., 1994)