AI Article Synopsis
- The study examines the shoot architecture of apple trees, focusing on how the distribution of bud types relates to the hydraulic conductance of sap pathways leading to those buds.
- The researchers analyzed 1-year-old shoots from five apple cultivars, measuring bud size and hydraulic conductance prior to bud burst, revealing significant variability among cultivars.
- The findings indicate that competition for hydraulic resources among nearby buds may influence their development, suggesting that the characteristics of the entire shoot system, including leaves, play a crucial role in determining which buds thrive.
Article Abstract
* In the apple tree (Malus domestica), shoot architecture - the distribution of lateral bud types and growth along the parent shoot - has been extensively investigated. The distal zone of a shoot is characterized by a high proportion of vegetative or floral axillary branches mixed with latent buds and aborted laterals. The hypothesis tested here was that bud development was related to hydraulic conductance of the sap pathway to the bud, independently of an acrotonic (proximal vs distal) effect. * The distal zone of 1-yr-old shoots was studied on five cultivars for bud size and composition (number of appendages) and hydraulic conductance before bud burst. * Bud size, composition and hydraulic conductance were highly variable for all cultivars. A positive correlation was demonstrated between both the number of cataphylls and green-leaf primordia, and hydraulic conductance. Cultivar and bud size affected the intercept of these relationships more than the slope, suggesting similar scaling between these variables, but different hydraulic efficiencies. A great proportion of small buds were also characterized by null values of hydraulic conductance. * This study suggests that hydraulically mediated competition exists between adjacent buds within the same branching zone, prefiguring the variability of lateral types in the following growing season. It is hypothesized that this developmental patterning is driven by hydraulic characteristics of the whole metamer, including the subtending leaf, during bud development.
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| http://dx.doi.org/10.1111/j.1469-8137.2008.02416.x | DOI Listing |
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