Chlorophyll evaluation on leaves of ‘Sauvignon Blanc’ during vegetative growth in São Joaquim, Santa Catarina, Brazil

Evolution of Leaf Chlorophylls, Carotenoids and Phenolic Compounds during Vegetation of Some Croatian Indigenous Red and White Grape Cultivars

“…The chlorophyll concentration in grapevine leaves in our study also varied depending on the phenological stage and cultivar (Figure 3, Table 3), with an increase from flowering to veraison and a decrease during grape ripening, which is consistent with the findings of other researchers [4,13]. Others suggested that chlorophyll accumulation increases rapidly with leaf expansion until flowering, then stabilizes and gradually decreases until the end of grape ripening [3,23]. Chlorophyll degradation is related to environmental stress, and the more rapid depletion of chlorophyll in leaves during vegetation may be related to higher temperatures and lower rainfall, as these types of events limit vegetative growth and accelerate leaf senescence [3,6,25].…”

“…The chlorophyll a/b ratio is a good indicator of leaf senescence, stress and damage to the photosynthetic apparatus [4]. The leaf chlorophyll a/b ratio ranged from 1.6 to 6, with an average value of 3.9 (Table 3), which is slightly higher than the values reported in other studies [3,4]. In general, plants with higher chlorophyll a/b ratios are better adapted to higher insolation, while lower values indicate stress conditions such as drought [4].…”

“…Others suggested that chlorophyll accumulation increases rapidly with leaf expansion until flowering, then stabilizes and gradually decreases until the end of grape ripening [3,23]. Chlorophyll degradation is related to environmental stress, and the more rapid depletion of chlorophyll in leaves during vegetation may be related to higher temperatures and lower rainfall, as these types of events limit vegetative growth and accelerate leaf senescence [3,6,25]. Since the peak of photosynthetic activity is reached around flowering, most secondary metabo-lites are accumulated around this time and begin to degrade gradually from veraison to harvest [23].…”

“…Chlorophylls are found in the chloroplasts, in almost all green parts of a plant, the leaves and stems [2]. Chlorophyll accumulation in grapevines varies according to the phenological stage: it increases rapidly with leaf growth until flowering, then stabilizes and may gradually decrease until the end of grape ripening [3]. Environmental conditions can affect the physiological processes of the plant, e.g., chlorophyll accumulation, gas exchange 2 of 15 and photosynthesis in grapevine leaves [4,5], with different cultivars growing under the same or similar environmental conditions having different chlorophyll levels [6].…”