Abstract
Viticulture is in great need of new rootstocks sharing features of scion growth control and tolerance to
major biotic and abiotic stress factors. A two year study was carried out in pots to assess performances
of the two new M1 and M3 rootstocks vs. those of the commercial rootstocks 1103P and 101-14. Potted
vines of M1, M3, 1103P and 101-14 rootstocks were grown in a calcareous and non calcareous soil and
for two consecutive seasons subjected to three N supply levels at 0, 2 and 4 g of N per pot. Vegetative
growth, leaf gas exchange, leaf greenness index (GI) and leaf blade nutrition were assessed. M1 and 1103P
were the least vigorous genotypes in terms of total pruning weight; M1 also manifested a stronger apical
dominance. Both M rootstocks and 101-14 showed increased leaf WUE at both N supply levels which
was due to ability to maintain, at increasing N supply, similar leaf assimilation rates while significantly
reducing leaf transpiration. Common tendency of any rootstocks was that increasing N supply corresponded
to lowered leaf concentration of K, P, Mg and B. M1 was able to combine a series of desirable
features including lower vigor, strong apical dominance, higher WUE at increasing N supply and quite
well balanced leaf nutritional pattern. In the present trial M3 did not have the expected devigorating
effect.
Lingua originale | English |
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pagine (da-a) | 99-106 |
Numero di pagine | 8 |
Rivista | Scientia Horticulturae |
Volume | 202 |
DOI | |
Stato di pubblicazione | Pubblicato - 2016 |
Keywords
- Gas-exchange
- Leaf chlorophyll
- Mineral nutrition
- Soil type
- Vigor
- Vitis vinifera L.