Biotic and abiotic stresses limit the growth, development, and production of sour passion fruit plants. The use of taller seedlings can reduce the vulnerability of the crop, as can cultivation in protected environments. However, due to the long period seedlings spend in the nursery, coupled with their continuous and indefinite growth, it is necessary to establish proper management to balance the growth of the aerial parts and the roots. Thus, the objective was to evaluate the effect of apical pruning of the aerial parts during the seedling formation phase, quantifying changes in the morphophysiology and reproductive cycle of plants grown both in a protected environment and in the open field. The treatments consisted of: control (T1), pruning after the emergence of the 4th, 7th, 9th, and 11th leaves (T2); 7th, 10th, 12th, and 14th leaves (T3); 10th, 13th, and 15th leaves (T4); and 7th oldest leaf, 10th, and 12th leaves (T5). During the seedling growth phase, all treatments with pruning management showed a greater stem diameter, exceeding 37 % compared to the control. Overall, when analyzing morphological and physiological parameters, treatment T3 stood out compared to the control. However, in the reproductive phase of the plant, both in open field and protected environments, treatments T2 and T4 showed over a 40 % increase in the flowering speed index compared to the control. These results impacted the higher harvest speed index in the first 40 days. However, these changes did not affect production and productivity, nor subsequent harvests.

中文翻译：

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修剪高大酸香果幼苗的地上部分，旨在提高幼苗质量和生殖早熟


生物和非生物胁迫限制了酸百香果植物的生长、发育和生产。使用较高的幼苗可以减少作物的脆弱性，在受保护的环境中种植也是如此。然而，由于幼苗在苗圃中度过的时间很长，再加上它们的持续和无限期的生长，因此有必要建立适当的管理来平衡地上部分和根部的生长。因此，目的是评估在幼苗形成阶段对地上部分进行顶端修剪的效果，量化在受保护环境和开阔田野中生长的植物的形态生理学和生殖周期的变化。处理包括：对照 （T1），第 4、7、9 和 11 片叶出苗后修剪 （T2）;第 7、10、12 和 14 叶 （T3）;第 10、13 和 15 叶 （T4）;以及第 7 古老的叶子、第 10 和第 12 叶 （T5）。在幼苗生长阶段，所有采用修剪管理的处理都显示出更大的茎粗，与对照相比超过 37%。总体而言，在分析形态学和生理参数时，与对照相比，治疗 T3 脱颖而出。然而，在植物的生殖阶段，无论是在开阔田野还是受保护的环境中，与对照相比，T2 和 T4 处理的开花速度指数增加了 40% 以上。这些结果影响了前 40 天内较高的收获速度指数。然而，这些变化并未影响生产和生产力，也未影响随后的收成。