Clonal evaluation and recurrent flowering of ornamental pineapple hybrid for use as miniature potted plant

ABSTRACT The objective of this study was to evaluate the cloning and recurrent flowering of the miniature pineapple hybrid ORN-MUT based on quantitative and qualitative morphological descriptors for possible use as a potted plant. Besides its reduced size, the ORN-MUT hybrid is notable for its pink fruit, absence of thorns and recurrent flowering at the crown, formed after the plant's complete cycle (562 days). The hybrid was assessed in the experimental field of the Embrapa Cassava and Fruits research unit in two flowering stages (first flowering and recurrent flowering) and was characterized by quantitative and qualitative morphological descriptors. A joint analysis of the data (multivariate analysis) was performed to verify the distinguishability and uniformity of the clones and parents. ORN-MUT presented uniformity in the first flowering, completing the phenological cycle at 75.70 days (first cycle) and 72.35 days (second cycle) after floral induction, respectively. The recurrent flowering occurred 170.60 days after induction. The peduncle is straight, with average length of 17.80 cm. The syncarp is small and pink, with conical-cylindrical shape. The crown has a moderately sharp tip with greenish central color and pink edges. In the recurrent flowering stage, the plants are smaller, with average size of 24.45 cm. The syncarp is miniaturized, with average of 1.20 layers of fruitlets and length of 1.61 cm. The quantitative and qualitative morphological traits allow classifying the hybrid as a potential potted plant.

摘要 本研究旨在基于定量与定性形态学描述符，对迷你菠萝杂交品种ORN-MUT的克隆繁育与重复开花特性开展评价，以探索其作为盆栽植物的应用潜力。该杂交品种除体型小巧外，还具有果实呈粉色、无刺以及在植株完成完整生长周期（562天）后于冠部形成重复开花的显著特性。研究于巴西农牧业研究公司（Embrapa）木薯与水果研究单元的试验田中开展，在两个开花阶段（初花期与重复开花期）对该杂交品种进行评估，并通过定量与定性形态学描述符完成性状表征。对数据集进行联合分析（多元分析），以验证克隆株与亲本的可区分性与一致性。ORN-MUT在初花期表现出一致性：其物候周期分别在花诱导后的75.70天（第一个周期）与72.35天（第二个周期）完成。重复开花发生于花诱导后的170.60天。花茎直立，平均长度为17.80厘米。复果小巧呈粉色，呈圆锥圆柱形。冠部顶端中等尖锐，中心呈绿调，边缘为粉色。处于重复开花期的植株体型更小，平均株高为24.45厘米。复果进一步小型化，平均含1.20层小果，长度为1.61厘米。定量与定性形态学性状可将该杂交品种归类为极具潜力的盆栽植物候选品种。