Abstract
The net CO2 gas exchange rate (NCER) of hand-(HP) and minimally pruned (MP) potted Chardonnay canopies was continuously monitored from about 20 d after budburst until post-harvest. Single-leaf gas ex-change readings were taken 4 times throughout the season and non-destructive estimates of leaf chlorophyll at veraison. Canopy leaf area development was registered, yield components and grape soluble sol-ids were recorded at harvest; samples were taken to determine dry matter partitioning into clusters, leaves and canes. The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines. The MP vines exhibited a 4-6-fold higher CO2 fixation than HP vines from about three weeks after budbreak till bloom. Canopy NCER started to recover in HP vines concurrently with the transition to a faster shoot growth phase, although by canopy completion NCER was still 13 % higher in MP. Sugar concentration of berries was not significantly lower in MP compared to HP despite a yield increase of about 70 %. The overall results indicate minimal pruning as a valuable tool to improve the performance of Chardonnay vines under our experimental conditions.
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Claims 11
Claim · model-written summary
Minimally pruned vines had a higher shoot number than hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e1“The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines”
Claim · model-written summary
Minimally pruned vines had reduced leaf and shoot size compared with hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e1“The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines”
Claim · model-written summary
Minimally pruned vines had a higher cluster number than hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e1“The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines”
Claim · model-written summary
Minimally pruned vines had smaller berries than hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e1“The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines”
Claim · model-written summary
Minimally pruned vines had fewer berries per cluster than hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e1“The MP vines showed higher shoot number, distinctly reduced leaf and shoot size, and a higher cluster number with smaller berries and less berries per cluster compared to HP vines”
Claim · model-written summary
Minimally pruned vines showed 4-6-fold higher CO2 fixation than hand-pruned vines from about three weeks after budbreak until bloom.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e2“The MP vines exhibited a 4-6-fold higher CO2 fixation than HP vines from about three weeks after budbreak till bloom”
Claim · model-written summary
By canopy completion, canopy NCER was still 13 % higher in minimally pruned vines than in hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e3“Canopy NCER started to recover in HP vines concurrently with the transition to a faster shoot growth phase, although by canopy completion NCER was still 13 % higher in MP”
Claim · model-written summary
Berry sugar concentration was not significantly lower in minimally pruned vines than in hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e4“Sugar concentration of berries was not significantly lower in MP compared to HP despite a yield increase of about 70 %”
Claim · model-written summary
Minimally pruned vines gave about 70 % higher yield than hand-pruned vines.
Verbatim
t0“minimally pruned Chardonnay canopies”
e0“hand-(HP) and minimally pruned (MP) potted Chardonnay canopies”
e4“Sugar concentration of berries was not significantly lower in MP compared to HP despite a yield increase of about 70 %”
Claim · model-written summary
Minimal pruning is a valuable tool to improve the performance of Chardonnay vines under the experimental conditions.
Verbatim
e5“The overall results indicate minimal pruning as a valuable tool to improve the performance of Chardonnay vines under our experimental conditions”
Claim · model-written summary
Canopy NCER in hand-pruned vines began to recover together with the transition to a faster shoot growth phase.
Verbatim
t0“minimally pruned Chardonnay canopies”
e3“Canopy NCER started to recover in HP vines concurrently with the transition to a faster shoot growth phase, although by canopy completion NCER was still 13 % higher in MP”