Effects of Nutrient Factors, Water-Supply, and Growth-Regulating Substances on the Vegetative Growth Pattern of Peas and their Relationship to the Node of First Flower

Peas were grown at two levels each of nutrient- and water-supply:some were pretreated with gibberellic acid (GA), N-dimethylaminosuccinamicacid (B995), or N-formylhydroxyaminoacetic acid (NFHAA). Alltreatments had some effect on internode extension and leaf growth.B995 and NFHAA acted as general inhibitors of growth, ratherthan suppressing growth of particular organs: their effect inlowering the number of the first flowering node (F) might berelated to this inhibition. Water-supply had a greater effecton the rate of node formation than had nutrient-supply, B995,or NFHAA, but had no effect on F: in this case there is no clearrelationship between vegetative growth and flowering. Theseresults are briefly discussed in relation to earlier work.