glad to see the exchange of ideas resumed, although probably best to move it to another thread if @Botanical_Bryce feels it is way off original topic. .
anyway, while my views run counter to @Barkslip and @Richard, i don’t claim that my views are conclusive, since nobody knows everything(hey, even einstein and newton have been proven wrong about certain stuff they were cocksure about or were wagering on). There’s always that risk, that some time in the future some of us will be proven wrong. Much like how we think the folks hundreds of years ago were backward and clueless
now, the conclusion definitively brought up by @Barkslip and @Richard is that once a rooted airlayer from a tree is removed and replanted, then it reverts to the chronological equivalent of a young seedling, other than being able to bear fruit so much faster.
it is so hard for me to accept that juvenility is conferred by a simple removal from the mother plant. Also, you can’t be labeled juvenile AND considered mature at the same time, can you?
if you plant certain citrus from seed, you will realize that you have to wait many years before tree ‘gets old’ enough to start flowering and bearing fruit. Certain citrus from seed grow wicked 3" spines as juveniles, but will lose this trait as they age. An airlayer from a fruiting citrus will not produce spines, because, well, apparently it is only for youngsters.
a better elaboration would be to bring up extremes in the fruit-growing world. If anyone here had experience growing tropical stuff, you’d have realized that certain long-lived species have long gestation periods when planted from seed. Some longer than a decade, and some even longer. A legendary lychee tree reportedly took half a century to start blooming. The only way you could skip juvenile stage is if you airlayer that 50 yr old tree.
quoted below seems to bolster my argument, plus adding a tangible novelty with regards to age of roots and the value of grafting to younger rootstock. Ageing/senescence of a perennial tree is reportedly tangible, at least with avocados, but the good news is that it can be ameliorated or diluted by grafting to young rootstock. As implied by the report, taking an airlayer from that avocado tree equates to a clone as old as the mother tree-- not a rejuvenated one. I lifted it from this official FAO webpage.
“Grafting is widely used because it is clonal. But graft takes about 10 years to fruit, sometimes more. It is apparent that the seedling rootstock imparts juvenility on th escion. Some tissue culturist know that shoots from an old tree as avocado, that has lost their capacity to regenerate, when grafted to a seedling, can revert to juvenile phase that responds to in vitro culture. This study is the first report of the influence of a seedling rootstock on imparting juvenility on the scion that in return results in delayed first fruiting. The prospects of reducing the juvenility period of a fruit tree into half, say 5-6 years in lanzones, means a tremendous commercial advantage in early and higher revenue. Ten lanzones seedlings planted in 1984 fruited after 21 years. Three plants from rooted cuttings planted in the same area fruited after 8 years while it seems that juvenility was overly extended in both sets, the relative difference is apparent. These trees were never fertilized, watered or pruned. Dr. Romulo Davide had 2 lanzones trees planted in 1959 that did not fruit for 30 years. |Rooting of cuttings is apparently the ideal propagation method for lanzones partly because it combines the efficiency and convenience of seedlings and grafting, and more importantly because it advances first fruiting and shortens the gestation period.”
will post more stuff, just couldn’t find it at the moment.