Abstract：
:In etiolated rye seedlings (Secale cereale L.) the cytokinin supply controls leaf growth. Dry weight and total amino-nitrogen, protein, total nucleic acid, DNA, and rRNA levels were similarly lowered in leaves depleted of their endogenous cytokinin supply by early excision of the seedling roots and increased by 70-100% after the addition of kinetin. The proportion of cytoplasmic ribosomes bound as polyribosomes was only slightly increased from 40% in cytokinin-deficient to 50% in kinetin-treated darkgrown leaves. White light increased the polyribosome proportion to 61%. In cytokinin-supplied leaves uptake and accumulation of L-[(3)H]leucine were greater than in cytokinin-deficient leaves. Under all conditions of cytokinin supply the same proportion of the total amino nitrogen content (80%) was present as protein nitrogen and virtually, the same percentage (60%) of the total uptake of L-[(3)H]leucine was incorporated into protein in dark-grown leaves. In light, significantly higher proportions of the amino nitrogen content and of the L-[(3)H]leucine uptake were incorporated into protein. The results suggest that the accumulation of substrate is a main cytokinin-controlled step determining the growth of the leaves.
journal_name
Plantajournal_title
Plantaauthors
de Boer J,Feierabend Jdoi
10.1007/BF00385122subject
Has Abstractpub_date
1978-01-01 00:00:00pages
67-73issue
1eissn
0032-0935issn
1432-2048journal_volume
142pub_type
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