Light-grown dwarf peas were disbudded except for a single lateral bud, then transferred to darkness at 24° C. During the dark period the seedlings were irradiated daily for 5 or 7 min with R or FR. The buds exposed to R developed into shoots faster than those irradiated with FR. The R effect was FR reversible, and the FR effect was R reversible. The Pfr form of phytochrome thus promoted shoot growth including cell division, DNA and RNA synthesis.
Ascorbic acid was found to increase bud development in Pisum sativum L. The interactions of ascorbic acid with indole‐3‐acetic acid, kinetin and gibberellic acid were studied. It was found that ascorbic acid promoted bud growth and overcame the inhibitory effect of auxin. When applied with gibberellin, bud growth was greatly enhanced. Ascorbic acid promoted bud development in red light only; it did not in far‐red or dark.
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