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Article

Interactions of Leaf Age, Fruiting, and Exogenous Cytokinins in Sangiovese Grapevines Under Non-Irrigated Conditions. I. Gas Exchange

S. Poni, C. Intrieri, O. Silvestroni
Am J Enol Vitic.  1994  45: 71-78  ; DOI: 10.5344/ajev.1994.45.1.71
S. Poni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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C. Intrieri
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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O. Silvestroni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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Abstract

The interactions of leaf age and gas exchange, together with modifications induced by fruiting and exogenous kinetin treatments, were investigated in field-grown Sangiovese (Vitis vinifera L.) grapevines. Analyses carried out both on a seasonal basis and within each sampling date as a function of the natural gradient of age along the shoot showed that maximum Pn occurred at 30 to 35 days of age. A progressive decline started at about 50 days and four-month-old leaves retained 45% of maximum Pn. Very young, rapidly expanding leaves (< 15 days) also showed a consistently lower Pn and water use efficiency (WUE) than recently fully expanded leaves. Differential rates of leaf senescence due to fruiting or kinetin were not observed. These data form a basis for improving the physiological understanding of widely used vineyard management operations (shoot topping, leaf removal) which normally induce variations in canopy leaf age.

  • leaf age
  • senescence
  • fruiting
  • cytokinins
  • photosynthesis
  • Received December 1992.
  • Copyright 1994 by the American Society for Enology and Viticulture

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Interactions of Leaf Age, Fruiting, and Exogenous Cytokinins in Sangiovese Grapevines Under Non-Irrigated Conditions. I. Gas Exchange
S. Poni, C. Intrieri, O. Silvestroni
Am J Enol Vitic.  1994  45: 71-78  ; DOI: 10.5344/ajev.1994.45.1.71
S. Poni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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C. Intrieri
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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O. Silvestroni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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Interactions of Leaf Age, Fruiting, and Exogenous Cytokinins in Sangiovese Grapevines Under Non-Irrigated Conditions. I. Gas Exchange
S. Poni, C. Intrieri, O. Silvestroni
Am J Enol Vitic.  1994  45: 71-78  ; DOI: 10.5344/ajev.1994.45.1.71
S. Poni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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C. Intrieri
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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O. Silvestroni
Istituto di Coltivazioni Arboree. Cattedra di Viticoltura, Sezione Viticola del Centro Ricerche Viticole ed Enologiche Università di Bologna, 40126 Bologna, Italy
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