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The Control of Apical Bud Growth and Senescence by Auxin and Gibberellin in Genetic Lines of Peas


, : The Control of Apical Bud Growth and Senescence by Auxin and Gibberellin in Genetic Lines of Peas. Plant Physiology 113(2): 631-637

Pea (Pisum sativum L.) lines G2 (dwarf) and NGB1769 (tall) (Sn Hr) produce flowers and fruit under long (LD) or short (SD) days. but senesce only under LD. Endogenous gibberellin (GA) levels were inversely correlated with photoperiod (over 9-18 h) and senescence: GA20 was 3-fold and GA, was 10- to 11-fold higher in flowering SD G2 shoots, and the vegetative tissues within the SD apical bud contained 4-fold higher levels of GA20, as compared with the LD tissues. Prefloral G2 plants under both photoperiods had GA1 and GA20 levels similar to the flowering plants under LD. Levels of indole-3-acetic acid (IAA) were similar in G2 shoots in LD or SD; SD apical bud vegetative tissues had a slightly higher IAA content. Young floral buds from LD plants had twice as much IAA as under SD. In NGB1769 shoots GA, decreased after flower initiation only under LD, which correlated with the decreased growth potential. We suggest that the higher GA' content of G2 and NGB1769 plants under SD conditions is responsible for the extended vegetative growth and continued meristematic activity in the shoot apex. This and the increased IAA level of LD floral buds may play a role in the regulation of nutrient partitioning, since more photosynthate partitions to reproductive tissue under LD conditions, and the rate of reproductive development in LD peas is faster than under SD.

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Accession: 002980893

PMID: 12223631

DOI: 10.2307/4277572

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Related references

Proebsting, W.M.; Davies, P.J.; Marx, G.A., 1978: Photoperiod induced changes in gibberellin metabolism in relation to apical growth and senescence in genetic lines of peas pisum sativum. In an early-flowering line of pea (G2) apical senescence occurs only in long days (LD), while growth in short days (SD) is indeterminate. In SD, G2 plants are known to produce a graft-transmissible substance which delays apical senescence in relat...

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Smith, M.A., 1984: The role of polyamides in apical senescence and gibberellin-induced internode growth in peas. Under a short day photoperiod, as senescence of apical buds of G2 peas was delayed, high polyamine concn. were sustained. In long day plants, as the apex senesced, the amount of polyamines/organ declined in parallel with decreases in the size of t...

Proebsting W.M.; Davies P.J., 1978: Photoperiod induced changes in gibberellin metabolism in relation to senescence in genetic lines of peas. Plant Physiology (Rockville) 61(4 SUPPL): 112

Zhu, Y.X., 1990: Gibberellin metabolism and apical senescence in peas. Gibberellin (GA) metabolism in peas was studied using exogenously applied [14C]GA12-aldehyde, [14C]GA12, [superscript 3H]GA9, [superscript 3H]GA20 and [superscript 3H]GA1. GAs were either applied to growing pea shoots or developing seed parts. GA...

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Kelly, M.O.; Davies, P.J., 1988: Photoperiodic and genetic control of carbon partitioning in peas and its relationship to apical senescence. Apical senescence but not flower initiation is delayed by short days (SD) compared to long days (LD) in pea plants (Pisum sativum L.) of genotype E Sn Hr. We recently reported that delay of senescence correlated with slower reproductive developmen...

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