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首页> 美国卫生研究院文献>Annals of Botany >Co-ordinated Growth between Aerial and Root Systems in Young Apple Plants Issued from in vitro Culture
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Co-ordinated Growth between Aerial and Root Systems in Young Apple Plants Issued from in vitro Culture

机译：体外培养引起的苹果幼树气生系统与根系协调生长

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• Background and Aims In several species exhibiting a rhythmic aerial growth, the existence of an alternation between root and shoot growth has been demonstrated. The present study aims to investigate the respective involvement of the emergence of new organs and their elongation in relation to this phenomenon and its possible genotypic variation in young apple plants.• Methods Two apple varieties, X6407 (recently named ‘Ariane’) and X3305 (‘Chantecler’ × ‘Baujade’), were compared. Five plants per variety, issued from in vitro culture, were observed in minirhizotrons over 4 months. For each plant, root emergence and growth were observed twice per week. Growth rates were calculated for all roots with more than two segments and the branching density was calculated on primary roots. On the aerial part, the number of leaves, leaf area and total shoot length were observed weekly.• Key Results No significant difference was observed between varieties in any of the final characteristics of aerial growth. Increase in leaf area and shoot length exhibited a 3-week rhythm in X3305 while a weaker signal was observed in Ariane. The primary root growth rate was homogeneous between the plants and likewise between the varieties, while their branching density differed significantly. Secondary roots emerged rhythmically, with a 3-week and a 2-week rhythm, respectively, in X3305 and ‘Ariane’. Despite a high intra-variety variability, significant differences were observed between varieties in the secondary root life span and mean length. A synchronism between leaf emergence and primary root growth was highlighted in both varieties, while an opposition phase was observed between leaf area increments and secondary root emergence in X3305 only.• Conclusion A biological model of dynamics that summarizes the interactions between processes and includes the assumption of a feedback effect of lateral root emergence on leaf emergence is proposed.
机译：•背景和目的在表现出有节奏的空中生长的几种物种中，已证明根与芽生长之间存在交替。本研究旨在调查年轻苹果植物中新器官的出现及其与这种现象有关的延伸及其可能的基因型变异。•方法两个苹果品种，X6407（最近命名为“ Ariane”）和X3305（比较了“香塔克勒（Chantecler）”ד鲍雅德（Baujade）”。在4个月的时间里，在微型根际放疗中观察到了每品种五株源自体外培养的植物。对于每种植物，每周两次观察到根的出现和生长。计算具有两个以上片段的所有根的生长速率，并计算原始根的分支密度。在气生部分，每周观察到叶片数量，叶面积和总芽长。•关键结果在气生生长的任何最终特征中，品种之间没有发现显着差异。在X3305中，叶面积和茎长的增加表现出3周的节律，而在阿丽亚娜中则观察到较弱的信号。各植物之间以及各品种之间的初生根生长速率均一，而其分枝密度差异显着。次生根有节奏地出现，在X3305和“ Ariane”中分别有3周和2周的节奏。尽管品种内的变异性很高，但在次生根的寿命和平均长度之间仍观察到显着差异。在两个品种中都强调了叶片出苗与初生根生长之间的同步性，而仅在X3305中观察到了叶片面积增加与次生根出苗之间的相反阶段。•结论动力学的生物学模型总结了过程之间的相互作用，包括假设提出了侧根出苗对叶片出苗的反馈效应。

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