Effects of extreme bud load and leaf removal treatments on leaf water potential, stomatal conductance and ripening of ‘Sultana’ (Vitis vinifera L.)

This study was conducted to determine the effects of three different bud load levels (15 buds, 25 buds and 30 buds m^-2) and two different leaf removal (25% and 50% on each vine shoot) treatments on number of bursted bud, midday leaf water potential (Ψ_mid), stomatal conductance (g_s), total soluble solids (TSS) and titratable acidity (TA) of own-rooted ‘Sultana Seedless’ (Vitis vinifera L.) in 2016 and 2017 vegetation season in Alaşehir, Turkey.
Vine spacing was 3.0 to 2.0 m and the vines were cane pruned on Y type trellis system.
Leaf removal treatments were performed only once approximately one month before veraison.
In this research, berries were sampled separately from upper and lower sides of the cluster.
Then values were analyzed separately (P<0.05). Results showed that TSS and TA values were influenced by the position of the berries on the cluster.
Measurements of Ψ_mid showed difference between -1.38 to -1.98 MPa.
Leaf g_s values were determined between 399.50 and 177.88 mmol m^‑2 s^‑1 in 2016 and 803.75-112.07 mmol m^‑2 s^‑1 in 2017 as well.
These findings indicate that extreme bud load on vines generally reduced leaf Ψ_mid, g_s, values and number of bursted buds according to data recorded over two consecutive vegetation periods.

XXX International Horticultural Congress IHC2018: International Symposium on Viticulture: Primary Production and Processing

T. Teker, O. Soltekin, A. Altindişli

grape, physiology, stress, crop, fruit quality

https://doi.org/10.17660/ActaHortic.2020.1276.29