Publications by authors named "Andrew M Barnett"
Background And Aims: In kiwifruit (Actinidia), the number of nodes per shoot is highly variable and is influenced by genotype and environmental conditions. To understand this developmental plasticity, three key processes were studied: organogenesis by the shoot apical meristem during shoot growth; expansion of phytomers; and shoot tip abortion.
Methods: Studies were made of organogenesis and shoot tip abortion using light and scanning electron microscopy.
Article Synopsis
- The study investigated how eight different clonal Actinidia rootstocks impact the development of scions—specifically, yellow kiwifruit—by examining shoot types and leaf area index (LAI).
- It classified axillary shoots from the scion as short, medium, or long and found that scions on low-vigor rootstocks produced fewer leaves and had more terminated shoots compared to those on vigorous rootstocks.
- The research concluded that while all rootstocks consistently affected shoot development, low-vigor rootstocks led to a higher proportion of slow-growing shoots, which terminated earlier in the season, thereby influencing future growth patterns.
We developed a framework for the quantitative description of Actinidia vine architecture, classifying shoots into three types (short, medium and long) corresponding to the modes of node number distribution and the presence/ absence of neoformed nodes. Short and medium shoots were self-terminated and had only preformed nodes. Based on the cut-off point between their two modes of node number distribution, short shoots were defined as having nine or less nodes, and medium shoots as having more than nine nodes.
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