amÔ≠>r` AßJya AZwgßYmZ H - National Research Centre for Grapes

NRC for Grapes | Annual Report 2006-07
At 45 and 60 days, 110R stock resulted in significantly higher P concentration than other rootstocks
lowest concentration was observed in Dogridge rootstock. Own rooted vines significantly higher
petiole P content then vines grafted on Dogridge rootstock at 60, 75 and 90 days. At 45 days
petioles of own rooted vines had significantly higher K content compared to the three rootstocks. At
90 days 110R and Dogridge rootstocks coned significantly higher K than Salt Creek. Significantly
higher Zinc concentration was observed in the petioles of own rooted vines compared to grafted
vines at all the stages of sampling.The studies were continued for the fruiting season 2006-07 also.
Self-rooted vines contained significantly higher K than the vines raised on rootstocks at 45 days
during foundation pruning 2006-2007. The vines on Salt creek rootstocks had significantly higher P
content compared to vines raised on 110R. All the three rootstocks resulted in significantly less
chloride concentration that own rooted vines. Significantly less Na content was found in case of vines
raised on 110R rootstock compared to Dogridge and Salt Creek. Studies with respect to other
nutrients and other stages are in progress.
110 R rootstock resulted in significantly higher bunch number per vine during the fruiting season
2006-2007. All the rootstocks produced significantly higher yield than own rooted vines. Yield per
vine was highest in case of 110 R / Thompson Seedless combination and was significantly higher
than Dogridge / Thompson Seedless combination. Shelf life studies showed that per cent
physiological loss of water from bunch was highest in case of own rooted vines. After 8 days at
ambient laboratory temperature the physiological loss in weight (PLW) was significantly higher in case
of own rooted vines (14.76%) than the grafted vines. All the three rootstocks did not differ
significantly with respect to the PLW.
Rootstock effect on zinc content in Tas-A-Ganesh tissues (2002-2006)
The vine tissues were sampled and analysed 12 times at different growth stages from the same vines
between 2002-2006. The concentration of the zinc was always significantly higher in petioles of own
rooted compared to grafted vines at all the stages of sampling. In 10 out of 12 sampling stages there
was no significant different in zinc content in the petioles of vines grafted on 110 R and those grafted
on Dogridge rootstock. The blades of own rooted vines also had significantly higher zinc content.
The vines grafted on the two rootstocks also did not differ in zinc uptake. The variations in Zn
concentrations observed in the tissues did not reflect in yield of the vines. The data pointed out that
the own rooted vines might require different rates of zinc applications compared to grafted vines to
maintain the same concentration in the vine parts.
Studies on evaluation of grapevine rhizosphere and non-rhizosphere fungi for P solubilization
Twelve Aspergillus isolates isolated from the rhizosphere and non- rhizosphere soils of the
grapevines were evaluated for the P solubilization in the laboratory. All the isolates from rhizosphere
and non- rhizosphere solubilized the P from added calcium triphosphate (250 ppm P) ranging from
124.3 ppm to 178 ppm compared to only 3.3 ppm in the absolute control after 5 days of
incubation. The higher content of solubilized P in case of above isolates was supported by more
reduction in the pH of the media. The lowest solubilization of P was observed in case of isolate
number 12 and the smallest zone diameter were also observed in the same isolate. The reduction in
pH in comparison to the control was also least in case of same isolate. Further studies in this respect
are in progress.
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