The relative contributions of xylem, phloem, and transpiration to fruit growth and the daily patterns of their flows have been determined in peach, during the two stages of rapid diameter increase, by precise and continuous monitoring of fruit diameter variations. Xylem, phloem, and transpiration contributions to growth were quantified by comparing the diurnal patterns of diameter change of fruits, which were then girdled and subsequently detached. Xylem supports peach growth by 70%, and phloem 30%, while transpiration accounts for ~60% of daily total inflows. These figures and their diurnal patterns were comparable among years, stages, and cultivars. Xylem was functional at both stage I and III, while fruit transpiration was high and strictly dependent on environmental conditions, causing periods of fruit shrinkage. Phloem imports were correlated to fruit shrinkage and appear to facilitate subsequent fruit enlargement. Peach displays a growth mechanism which can be explained on the basis of passive unloading of photoassimilates from the phloem. A pivotal role is played by the large amount of water flowing from the tree to the fruit and from the fruit to the atmosphere.

Morandi B., Rieger M., Corelli Grappadelli L. (2007). Vascular flows and transpiration affect peach (Prunus Persica Batsch.) fruit daily growth. JOURNAL OF EXPERIMENTAL BOTANY, 58(14), 3941-3947 [10.1093/jxb/erm248].

Vascular flows and transpiration affect peach (Prunus Persica Batsch.) fruit daily growth.

MORANDI, BRUNELLA;CORELLI GRAPPADELLI, LUCA
2007

Abstract

The relative contributions of xylem, phloem, and transpiration to fruit growth and the daily patterns of their flows have been determined in peach, during the two stages of rapid diameter increase, by precise and continuous monitoring of fruit diameter variations. Xylem, phloem, and transpiration contributions to growth were quantified by comparing the diurnal patterns of diameter change of fruits, which were then girdled and subsequently detached. Xylem supports peach growth by 70%, and phloem 30%, while transpiration accounts for ~60% of daily total inflows. These figures and their diurnal patterns were comparable among years, stages, and cultivars. Xylem was functional at both stage I and III, while fruit transpiration was high and strictly dependent on environmental conditions, causing periods of fruit shrinkage. Phloem imports were correlated to fruit shrinkage and appear to facilitate subsequent fruit enlargement. Peach displays a growth mechanism which can be explained on the basis of passive unloading of photoassimilates from the phloem. A pivotal role is played by the large amount of water flowing from the tree to the fruit and from the fruit to the atmosphere.
2007
Morandi B., Rieger M., Corelli Grappadelli L. (2007). Vascular flows and transpiration affect peach (Prunus Persica Batsch.) fruit daily growth. JOURNAL OF EXPERIMENTAL BOTANY, 58(14), 3941-3947 [10.1093/jxb/erm248].
Morandi B.; Rieger M.; Corelli Grappadelli L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/49765
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