Revisiting phase change: Ontogenetic and physiological ageing in vegetative propagation
Vol 7, Issue 1, 2024
VIEWS - 2430 (Abstract)
Abstract
For centuries, stem cuttings harvested from sexually mature trees have been recognized to be more difficult to root than those from juvenile shoots. This has been poorly understood and attributed to a combination of ontogenetic and physiological ageing. The recent suggestion that micro-RNA may play a key role in phase change has stimulated a re-examination of some old data that identified pre-severance light x nutrient interactions affecting the rooting ability of stem cuttings. This was linked to vigorous growth and active photosynthesis without constraint from accumulated starch. Support for the prime importance of physiological factors was also obtained when seeking to induce physiological youth in the crowns of ontogenetically mature trees by the induction of roots within the tree crown. Meanwhile, at the other end of the phase change spectrum, floral initiation occurred when the opposite set of environmental conditions prevailed so that growth was stunted, and carbohydrates accumulated in leaves and stems. A re-examination of this literature suggests that rooting ability is driven at the level of an individual leaf and internode emerging from the terminal bud affecting both morphological and physiological activity. In contrast, flowering occurs when internode elongation and assimilate mobilization were hindered. It is therefore suggested that the concepts of juvenility and ageing are not relevant to vegetative propagation and should instead be replaced by physiological and morphological ‘fitness’ to root.
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1. Hartmann, Kester. Plant Propagation: Principles and Practices, 2nd edition. Prentice-Hall, Englewood Cliffs, 1968.
2. Davies FT, Geneve RL, Wilson SB. Hartmann and Kester’s Plant Propagation: Principles and Practices, 9th edition. Pearson Education Inc., 2018.
3. Wendling I, Trueman SJ, Xavier A. Maturation and related aspects in clonal forestry—Part I: concepts, regulation and consequences of phase change. New Forests. 2014, 45(4): 449-471. doi: 10.1007/s11056-014-9421-0
4. Wendling I, Trueman SJ, Xavier A. Maturation and related aspects in clonal forestry—part II: reinvigoration, rejuvenation and juvenility maintenance. New Forests. 2014, 45(4): 473-486. doi: 10.1007/s11056-014-9415-y
5. Fortanier EJ, onkers H. Juvenility and maturity of plants as influenced by their ontogenetical and physiological ageing, ISHS Acta Horticulturae 56: Symposium on Juvenility in Woody Perennials. Acta Horticulturae. 1976, (56): 37-44. doi: 10.17660/actahortic.1976.56.2
6. Wareing PF, Frydman VM. General aspects of phase change, with special reference to Hedera helix L. Acta Horticulturae. 1976, (56): 57-70. doi: 10.17660/actahortic.1976.56.4
7. Hallé F, Oldeman RAA, Tomlinson PB. Tropical Trees and Forests. Springer Berlin Heidelberg, 1978. doi: 10.1007/978-3-642-81190-6
8. Leakey RRB. Plant cloning: macropropagation. Encyclopedia of Agriculture and Food Systems. Published online 2014: 349-359. doi: 10.1016/b978-0-444-52512-3.00223-0
9. Leakey RRB, Storeton-West R. The rooting ability of Triplochiton scleroxylon cuttings: the interactions between stockplant irradiance, light quality and nutrients. Forest Ecology and Management. 1992, 49(1-2): 133-150. doi: 10.1016/0378-1127(92)90166-7
10. Hoad SP, Leakey RRB. Effects of light quality on gas exchange and dry matter partitioning in Eucalyptus grandis W. Hill ex Maiden. Forest Ecology and Management. 1994, 70(1-3): 265-273. doi: 10.1016/0378-1127(94)90092-2
11. Hoad SP, Leakey RRB. Effects of pre-severance light quality on the vegetative propagation of E1ucalyptus grandis W. Hill ex Maiden. Trees. 1996, 10(5): 317-324. doi: 10.1007/bf02340778
12. Leakey RRB, Coutts MP. The dynamics of rooting in Triplochiton scleroxylon cuttings: their relation to leaf area, node position, dry weight accumulation, leaf water potential and carbohydrate composition. Tree Physiology. 1989, 5(1): 135-146. doi: 10.1093/treephys/5.1.135
13. Baurens FC, Nicolleau J, Legavre T, et al. Genomic DNA methylation of juvenile and mature Acacia mangium micropropagated in vitro with reference to leaf morphology as a phase change marker. Tree Physiology. 2004, 24(4): 401-407. doi: 10.1093/treephys/24.4.401
14. Huijser P, Schmid M. The control of developmental phase transitions in plants. Development. 2011, 138(19): 4117-4129. doi: 10.1242/dev.063511
15. Poethig RS. Vegetative phase change and shoot maturation in plants. Developmental Timing. Published online 2013: 125-152. doi: 10.1016/b978-0-12-396968-2.00005-1
16. Krivmane B, Ruņģe KS, Samsone I, et al. Differentially expressed conserved plant vegetative phase-change-related microRNAs in mature and rejuvenated silver birch in vitro propagated tissues. Plants. 2023, 12(10): 1993. doi: 10.3390/plants12101993
17. Wareing PF. Problems of juvenility and flowering in trees. Journal of the Linnean Society of London, Botany. 1959, 56(366): 282-289. doi: 10.1111/j.1095-8339.1959.tb02504.x
18. Dick JMcP, Leakey RRB. Differentiation of the dynamic variables affecting rooting ability in juvenile and mature cuttings of cherry (Prunus avium). The Journal of Horticultural Science and Biotechnology. 2006, 81(2): 296-302. doi: 10.1080/14620316.2006.11512065
19. Leakey RRB, Mohammed HRS. Effects of stem length on root initiation in sequential single-node cuttings of Triplochiton scleroxylon K. Schum., Journal of Horticultural Science, 1985. 60, 431-437. doi: 10.1093/treephys/1.2.193
20. Leakey RRB. Stockplant factors affecting root initiation in cuttings of Triplochiton scleroxylon K. Schum., an indigenous hardwood of West Africa. Journal of Horticultural Science. 1983, 58(2): 277-290. doi: 10.1080/00221589.1983.11515121
21. Newton AC, Dick JMcP, McBeath C, Leakey RRB. The influence of R:FR ratio on the growth, photosynthesis and rooting ability of Terminalia spinosa Engl. and Triplochiton scleroxylon K. Schum, Annals of Applied Biology, 1996, 128(3): 541-556. doi: 10.1111/j.1744-7348.1996.tb07113.x
22. Pauku RL, Lowe A, Leakey RRB. Domestication of indigenous fruit and nut trees for agroforestry in the Solomon Islands. Forests, Trees and Livelihoods. 2010, 19(3): 269-287. doi: 10.1080/14728028.2010.9752671
23. Longman KA, Manurung R, Leakey RRB. Use of small, clonal plants for experiments on factors affecting flowering in tropical trees. In: Reproductive Ecology of Tropical Forest Plants, pp. 389-399. Man and the Biosphere Series, UNESCO Paris and Parthenon Publishing. 1990.
24. Leakey RRB, Ferguson NR, Longman KA. Precocious flowering and reproductive biology of Triplochiton scleroxylon K. Schum. Commonwealth Forestry Review, 1981; 60, 117-126.
25. Leakey RRB. Nauclea diderrichii: rooting of stem cuttings, clonal variation in shoot dominance, and branch plagiotropism. Trees. 1990, 4(3). doi: 10.1007/bf00225781
26. Leakey RRB. Prediction of branching habit of clonal Triplochiton scleroxylon. Crop Physiology of Forest Trees. In: Tigerstedt PA, Puttonen P, Koski V. pp. 71-80. University of Helsinki, 1986.
27. Ladipo DO, Leakey RRB, Grace J. Clonal variation in apical dominance in young plants of Triplochiton scleroxylon K. Schum: responses to decapitation. Silvae Genetica, 1991; 40, 135-140.
28. Ladipo DO, Leakey RRB, Grace J. Bud activity of decapitated, nursery-grown plants of Triplochiton scleroxylon in Nigeria: effects of light, temperature and humidity. Forest Ecology and Management. 1992, 50(3-4): 287-298. doi: 10.1016/0378-1127(92)90343-8
29. Leakey RRB, Longman KA. Physiological, environmental and genetic variation in apical dominance as determined by decapitation in Triplochiton scleroxylon. Tree Physiology. 1986, 1(2): 193-207. doi: 10.1093/treephys/1.2.193
30. Ladipo DO, Leakey RRB, Grace J. Clonal variation in a four year old plantation of Triplochiton scleroxylon K. Schum. and its relation to the Predictive Test for Branching Habit. Silvae Genetica. 1991b, 40:130-135.
31. Dick JMcP and Dewar RC. A mechanistic model of carbohydrate dynamics during adventitious root development in leafy cuttings. Annals of Botany. 1992, 70(4): 371-377. doi: 10.1093/oxfordjournals.aob.a088487
32. Longman, K.A. Tropical forest trees. Handbook of Flowering Vol 1. 1985, pp. 23-39. CRC Press.
33. Leakey RRB, Tientcheu Avana M-L, Awazi NP, Assogbadjo AE, Mabhaudhi T, Hendre PS, Degrande A, Hlahla S, Manda L. The future of food: domestication and commercialization of indigenous food crops in Africa over the third decade (2012-2021), Sustainability, 2022; 14: 2355. doi: 10.3390/su14042355
34. Leakey RRB. A re-boot of tropical agriculture benefits food production, rural economies, health, social justice and the environment. Nature Food. 2020, 1(5): 260-265. doi: 10.1038/s43016-020-0076-z
DOI: https://doi.org/10.24294/th.v7i1.4169
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