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Physiological effects of summer prun...

Li, Kuo-Tan.

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Physiological effects of summer pruning in apple trees.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Physiological effects of summer pruning in apple trees./
Author:	Li, Kuo-Tan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2001,
Description:	238 p.
Notes:	Source: Dissertations Abstracts International, Volume: 63-05, Section: B.
Contained By:	Dissertations Abstracts International63-05B.
Subject:	Plant propagation. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3011217
ISBN:	9780493200712

Physiological effects of summer pruning in apple trees.
Li, Kuo-Tan.

Physiological effects of summer pruning in apple trees. - Ann Arbor : ProQuest Dissertations & Theses, 2001 - 238 p.

Source: Dissertations Abstracts International, Volume: 63-05, Section: B.

Thesis (Ph.D.)--Cornell University, 2001.

This item must not be sold to any third party vendors.

Summer pruning has been commonly used in apple (Malus domestica Borkh.) orchards to control canopy size and improve fruit color. However, it is expected that the removal of healthy, photosynthetically efficient shoot leaves during the growing season might impair the canopy photosynthetic function and result in shortage of carbohydrate supply for the demand of fruit and vegetative growth. To test this hypothesis, commercial-style summer pruning at various levels of severity was imposed on mature 'Empire' apple trees in Geneva, New York. Summer pruning increased canopy light transmission and light availability for interior leaves. However, photosynthesis of shaded leaves did not recover after re-exposure. Canopy photosynthesis, transpiration, and light interception were reduced in relation to the severity of summer pruning. With commercial ranges of crop load, light to moderate pruning severity did not significantly affect fruit growth. Effects of summer pruning on fruit size, return blooming and root survival were negative-exponentially related to physiological crop load, i.e. canopy photosynthesis per fruit, which represents the carbohydrate availability to fruit after pruning treatments. Results suggested that compared to pruning severity alone, carbon balance provides better explanations on the inconsistency of summer pruning effects. In addition, the impact of reduced carbohydrate supply after summer pruning on vegetative and reproductive performance may have been compensated by the simultaneous decrease in canopy transpiration and improved stem water potential. This compensation might be modified by weather conditions. Simulations with a simplified carbohydrate balance model was tested to integrate the responses of plants to summer pruning. The comparison between field measurements and simulation output generated valuable information to improve the precision of the model and the strategies for summer pruning.

ISBN: 9780493200712Subjects--Topical Terms:

1621657
Plant propagation.

Physiological effects of summer pruning in apple trees.
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245 1 0 $a Physiological effects of summer pruning in apple trees.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2001
300 $a 238 p.
500 $a Source: Dissertations Abstracts International, Volume: 63-05, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Lakso, Alan N.
502 $a Thesis (Ph.D.)--Cornell University, 2001.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Summer pruning has been commonly used in apple (Malus domestica Borkh.) orchards to control canopy size and improve fruit color. However, it is expected that the removal of healthy, photosynthetically efficient shoot leaves during the growing season might impair the canopy photosynthetic function and result in shortage of carbohydrate supply for the demand of fruit and vegetative growth. To test this hypothesis, commercial-style summer pruning at various levels of severity was imposed on mature 'Empire' apple trees in Geneva, New York. Summer pruning increased canopy light transmission and light availability for interior leaves. However, photosynthesis of shaded leaves did not recover after re-exposure. Canopy photosynthesis, transpiration, and light interception were reduced in relation to the severity of summer pruning. With commercial ranges of crop load, light to moderate pruning severity did not significantly affect fruit growth. Effects of summer pruning on fruit size, return blooming and root survival were negative-exponentially related to physiological crop load, i.e. canopy photosynthesis per fruit, which represents the carbohydrate availability to fruit after pruning treatments. Results suggested that compared to pruning severity alone, carbon balance provides better explanations on the inconsistency of summer pruning effects. In addition, the impact of reduced carbohydrate supply after summer pruning on vegetative and reproductive performance may have been compensated by the simultaneous decrease in canopy transpiration and improved stem water potential. This compensation might be modified by weather conditions. Simulations with a simplified carbohydrate balance model was tested to integrate the responses of plants to summer pruning. The comparison between field measurements and simulation output generated valuable information to improve the precision of the model and the strategies for summer pruning.
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