Abstract
Background and Aims Some grapevine cultivars such as Malbec have unstable yield, due to poor fruitset or fruitlet abscission. The phenomenon is known as ‘shatter’ and this study aims to explore the potential of applying the shoot girdling technique at flowering, to direct the carbohydrate partitioning towards inflorescences and reduce shatter. Methods and Results Fruitful Malbec shoots were girdled above the apical bunch, below the basal bunch, double girdled or not girdled (Control) during 2017 and 2018. Most vegetative growth parameters were unaffected, but shoots widened and the leaf expansion improved in the fruit zone. Fruitset doubled compared to that of the Control, ovary abortion was reduced, and fruit yield increased, mainly due to a greater number of small berries in the base and double girdled treatments. In addition, base girdling increased TSS per berry, reducing the concentration of phenolic substances in the normal size berries. Girdling effects were consistent during both seasons. Conclusions Shoot girdling below the basal bunch proved to be effective in reducing shatter. The increase in carbohydrate supply available to the inflorescences during flowering was able to augment their weak sink strength relative to the perennial organs. Significance of the Study The study contributes to an understanding of the importance of the photoassimilates flow towards inflorescences in reducing shatter and increasing yield in Malbec vines.
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Claims 10
Claim · model-written summary
Girdling left most vegetative growth parameters unaffected.
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Most vegetative growth parameters were unaffected”
t0“grapevine cv. Malbec”
t1“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Girdling widened shoots.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoots widened”
t0“grapevine cv. Malbec”
t1“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Girdling improved leaf expansion in the fruit zone.
- Material
- Malbect0
- Organ / stage
- fruit zonee0
- Treatment
- Girdlingt0
- Outcome
- leaf expansione0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the leaf expansion improved in the fruit zone”
t0“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Fruit set doubled after girdling compared with the control.
- Material
- Malbect0
- Treatment
- Girdlingt0
- Outcome
- Fruitsete0
- Direction
- doublede0
- Value
- doublede0
- Comparator
- Controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruitset doubled compared to that of the Control”
t0“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Girdling reduced ovary abortion.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ovary abortion was reduced”
t0“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Fruit yield increased after girdling, mainly through more small berries in the base and double girdled treatments.
- Material
- Malbect0
- Treatment
- base and double girdled treatmentse0
- Outcome
- fruit yielde0
- Direction
- increasede0
- Qualifier
- greater number of small berriese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fruit yield increased, mainly due to a greater number of small berries in the base and double girdled treatments”
t0“Girdling of shoots at flowering reduces shatter in grapevine cv. Malbec”
Claim · model-written summary
Base girdling increased TSS per berry.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“base girdling increased TSS per berry”
t0“grapevine cv. Malbec”
Claim · model-written summary
Base girdling reduced phenolic-substance concentration in normal-size berries.
- Material
- Malbect0
- Organ / stage
- normal size berriese0
- Treatment
- base girdlinge0
- Outcome
- concentration of phenolic substancese0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“base girdling increased TSS per berry, reducing the concentration of phenolic substances in the normal size berries”
t0“grapevine cv. Malbec”
Claim · model-written summary
Shoot girdling below the basal bunch reduced shatter.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shoot girdling below the basal bunch proved to be effective in reducing shatter.”
t0“grapevine cv. Malbec”
Claim · model-written summary
The authors attribute stronger inflorescence sink strength to increased carbohydrate supply during flowering.
- Material
- Malbect0
- Outcome
- sink strengthe0
- Direction
- augmente0
- Qualifier
- increase in carbohydrate supplye0
- Comparator
- perennial organse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in carbohydrate supply available to the inflorescences during flowering was able to augment their weak sink strength relative to the perennial organs.”
t0“grapevine cv. Malbec”
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