This research was carried out to study the effect of summer pruning on the growth and production of two grape varieties Vitis vivifera L. Halwani and Baladdi. The study was conducted in Kadmous during 2012 growing season on two varieties of grape tre
es reared on wiredraw. Seven treatments were used: 1- control, 2- shoot thinning, 3- shoot thinning and hedging, 4- shoot thinning and axillary shoot removal, 5- shoot thinning and axillary shoot removal, 6- shoot thinning and axillary shoot removal and leaf removal, 7- shoot thinning and leaf removal.
Results show that hedging improves weight of cluster and berry due to the increase in fruit set percentage which leads to an increase in grape production. Shoot thinning increases TSS yet other processes have negative effects: the hedging process increases acid titration in the Baladdi cultivar but in the Halwani cultivar hedging and axillary shoot removal increases acid titration.
Understanding the relationship between root system and shoot related traits
is an important objective in crop breeding programs. Canonical correlation
analysis has been adopted to study the strength of association between the root
morphological tr
aits and shoot morphological traits under low-moisture stress
and well-watered conditions and to find the root morphological characters that
have the largest influence on shoot-related traits in seedling stage. Most of the
traits under study revealed a significant reduction under low-moisture stress
condition except root length which showed a significant increasing under the
same condition. Root length and root number were had the largest effect on
shoot dry weight and plant height under low-moisture stress and well-watered
condition. The results of cumulative redundancy showed that about 45% of the
total variability in the shoot-related characters is accounted for by the root
morphological characters under control condition and this percentage reduced
up to 41% under moisture stress.
