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Posts: 208
A month ago
After reading the paragraphs below, answer the questions that follow.

Ethylene triggers the ripening of fruit for many plant species but does not seem to play an important role for the ripening of grapes. Scientists hypothesized that the trigger for the ripening of grape fruits is abscisic acid (ABA). They sprayed unripe Cabernet Sauvignon grapes with different concentrations of ABA and tracked several fruit characteristics over time: percent of fruits that are purple, concentration of anthocyanin (a purple pigment) per fruit, weight of each fruit, and total soluble solids per fruit as measured by °Brix. °Brix measurements indicate the amount of sugar in the fruit, and determine how much alcohol a wine will have. Higher values of each measurement indicate a greater degree of ripening. The scientists' results are shown in these four graphs.


Source: Wheeler, S., Loveys, B., Ford, C., & Davies, C. (2009). The relationship between the expression of abscisic acid biosynthesis genes, accumulation of abscisic acid and the promotion of Vitis vinifera L. berry ripening by abscisic acid. Australian Journal of Grape and Wine Research, 15(3), 195-204.


The visual indicator for grape ripening is the color of the fruit. Does adding ABA appear to speed up the ripening of grape fruit?

▸ No, because fruits in all the treatments were colored by the end of the experiment.

▸ No, because fruits in all the treatments have similar amounts of anthocyanin (purple pigment) by the end of the experiment.

▸ Yes, because there were always more colored fruits in both ABA treatments compared to the control.

▸ Yes, because fruits that were treated with ABA have more anthocyanin (purple pigment) earlier than the control.
Textbook 
Campbell Biology: Concepts and Connections
Edition: 8th
Authors:
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Posts: 208
A month ago
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Yes, because fruits that were treated with ABA have more anthocyanin (purple pigment) earlier than the control.
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wrote...
A month ago
Thanks
wrote...
A month ago
After reading the paragraphs below, answer the questions that follow.

Ethylene triggers the ripening of fruit for many plant species but does not seem to play an important role for the ripening of grapes. Scientists hypothesized that the trigger for the ripening of grape fruits is abscisic acid (ABA). They sprayed unripe Cabernet Sauvignon grapes with different concentrations of ABA and tracked several fruit characteristics over time: percent of fruits that are purple, concentration of anthocyanin (a purple pigment) per fruit, weight of each fruit, and total soluble solids per fruit as measured by °Brix. °Brix measurements indicate the amount of sugar in the fruit, and determine how much alcohol a wine will have. Higher values of each measurement indicate a greater degree of ripening. The scientists' results are shown in these four graphs.


Source: Wheeler, S., Loveys, B., Ford, C., & Davies, C. (2009). The relationship between the expression of abscisic acid biosynthesis genes, accumulation of abscisic acid and the promotion of Vitis vinifera L. berry ripening by abscisic acid. Australian Journal of Grape and Wine Research, 15(3), 195-204.


What is the difference between fruits sprayed with the low (5 mg/L) concentration of ABA and the high (400 mg/L) concentration of ABA?

▸ The high concentration produces fruit with less sugar at the end of the experiment.

▸ The high concentration results in the earlier occurrence of colored fruit and maximum fruit size.

▸ The high concentration induces an earlier occurrence of the maximum amount of anthocyanin (purple pigment).

▸ The high concentration has smaller fruit until the end of the experiment.
wrote...
A month ago
The high concentration results in the earlier occurrence of colored fruit and maximum fruit size.
wrote...
A month ago
After reading the paragraphs below, answer the questions that follow.

Ethylene triggers the ripening of fruit for many plant species but does not seem to play an important role for the ripening of grapes. Scientists hypothesized that the trigger for the ripening of grape fruits is abscisic acid (ABA). They sprayed unripe Cabernet Sauvignon grapes with different concentrations of ABA and tracked several fruit characteristics over time: percent of fruits that are purple, concentration of anthocyanin (a purple pigment) per fruit, weight of each fruit, and total soluble solids per fruit as measured by °Brix. °Brix measurements indicate the amount of sugar in the fruit, and determine how much alcohol a wine will have. Higher values of each measurement indicate a greater degree of ripening. The scientists' results are shown in these four graphs.


Source: Wheeler, S., Loveys, B., Ford, C., & Davies, C. (2009). The relationship between the expression of abscisic acid biosynthesis genes, accumulation of abscisic acid and the promotion of Vitis vinifera L. berry ripening by abscisic acid. Australian Journal of Grape and Wine Research, 15(3), 195-204.


Should the wine industry recommend the use of ABA to speed up ripening of grapes for wine making?

▸ No, because there is no difference in the trajectory of ripening when ABA is added compared to when it is not.

▸ Yes, because more fruit sugars will be present earlier in fruits sprayed with ABA compared to fruits that are not.

▸ Yes, because colored, full-sized fruit can be produced earlier when ABA is added.

▸ No, because any early increases in fruit sugars as a result of ABA addition decreases as ripening progresses.
wrote...
A month ago
No, because any early increases in fruit sugars as a result of ABA addition decreases as ripening progresses.
wrote...
A month ago
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