Heteroblasty is the significant and abrupt change in form and function, that occurs over the lifespan of certain plants. Characteristics affected include internode length and stem structure as well as leaf form, size and arrangement. It should not be confused with seasonal heterophylly, where early and late growth in a season are visibly different. This change is different from a homoblastic change which is a gradual change or little change at all, so that there is little difference between the juvenile and adult stages. Some characteristics affected by heteroblastic change include the distance between successive leaves (internode length) and stem structure as well as leaf form, size and arrangement. Heteroblasty is found in many plant families as well as only some species within a genus.
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| - Heteroblasty (botany) (en)
- Eterofillia (it)
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| - Heteroblasty is the significant and abrupt change in form and function, that occurs over the lifespan of certain plants. Characteristics affected include internode length and stem structure as well as leaf form, size and arrangement. It should not be confused with seasonal heterophylly, where early and late growth in a season are visibly different. This change is different from a homoblastic change which is a gradual change or little change at all, so that there is little difference between the juvenile and adult stages. Some characteristics affected by heteroblastic change include the distance between successive leaves (internode length) and stem structure as well as leaf form, size and arrangement. Heteroblasty is found in many plant families as well as only some species within a genus. (en)
- In botanica, con il termine eterofillia si intende quel fenomeno per il quale si trovano foglie di forme differenti per dimensione, forma, posizione o funzione sulla stessa pianta. Il termine deriva dal greco: hetero significa "diverso" e phyllia significa "foglia". Nell'edera (Hedera helix), l'eterofillia si presenta tra le foglie presenti sui fusti più prossimi al suolo (che non portano fiori) con 3 o 5 lobi, palminervie e quelle dei rami fioriferi più in alto ellittiche a bordi interi e penninervie.
* foglie lobate.
* foglie intere (it)
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| - Heteroblasty is the significant and abrupt change in form and function, that occurs over the lifespan of certain plants. Characteristics affected include internode length and stem structure as well as leaf form, size and arrangement. It should not be confused with seasonal heterophylly, where early and late growth in a season are visibly different. This change is different from a homoblastic change which is a gradual change or little change at all, so that there is little difference between the juvenile and adult stages. Some characteristics affected by heteroblastic change include the distance between successive leaves (internode length) and stem structure as well as leaf form, size and arrangement. Heteroblasty is found in many plant families as well as only some species within a genus. This random spread of heteroblastic plants across species is believed to be caused by convergent evolution. The earlier and later stages of development are commonly labeled as juvenile and adult respectively, particularly in relation to leaves.Heteroblastic change is thus often referred to as ‘vegetative phase change’ (distinct from reproductive phase change) in the plant molecular biology literature. The term heteroblasty was coined by the German botanist Karl Ritter von Goebel, along with homoblasty for plants with leaf characteristics that do not change significantly. Leonard Cockayne observed that heteroblasty occurred in an unusually high proportion of tree species native to New Zealand. (en)
- In botanica, con il termine eterofillia si intende quel fenomeno per il quale si trovano foglie di forme differenti per dimensione, forma, posizione o funzione sulla stessa pianta. Il termine deriva dal greco: hetero significa "diverso" e phyllia significa "foglia". Può essere di origine genetica o indotta da condizioni ambientali. L'eterofillia genetica è un tratto tipico e costante della specie (come in molti ranuncoli) insensibile all'influenza dell'ambiente; spesso si assiste a foglie diverse a seconda dell'età (foglie giovani e foglie adulte). L'eterofillia ambientale è un adattamento alle diverse condizioni ecologiche (luce, immersione, ecc.). Nell'edera (Hedera helix), l'eterofillia si presenta tra le foglie presenti sui fusti più prossimi al suolo (che non portano fiori) con 3 o 5 lobi, palminervie e quelle dei rami fioriferi più in alto ellittiche a bordi interi e penninervie.
* foglie lobate.
* foglie intere Questa caratteristica è molto marcata su Araucaria heterophylla, una conifera, che deve il suo nome specifico proprio a questa caratteristica. (it)
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