Ethylene is involved in the nodulation phenotype of Pisum sativum R50 (sym 16), a pleiotropic mutant that nodulates poorly and has pale green leaves.

Abstract excerpt

R50 is characterized as a pleiotropic pea mutant; it forms few nodules and has short lateral roots, short stature and pale leaves. Using grafting techniques, R50 paleness was found to be controlled by the shoot of the mutant whereas the nodulation phenotype was regulated by its root. The paleness of R50 is due to a lower than normal total chlorophyll content in its young leaves. The defect appears to be overcome...

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