Influence of Cultivation Season on Phenolic Compounds and Plant Nutrient Element Composition in Purple Leafy Sweet Potato
Other Title
栽培季節對紫色葉菜甘藷酚類化合物與植體營養元素組成之影響
Journal
台灣農業研究
Journal Volume
75
Journal Issue
3
Start Page
419
End Page
433
ISSN
2790-086X
Date Issued
2026-09-05
Author(s)
Abstract
This study investigated how the cultivation season affects phenolic compounds and plant nutrient element composition in purple leafy sweet potato (Ipomoea batatas “CYY84–67”) grown under field conditions in Taiwan. Four seasonal plantings, representing spring, summer, autumn, and winter, were conducted from 2017 to 2018. Total phenolic content (TPC), total flavonoid content (TFC), and total anthocyanin content (TAC) were measured in leaves and stems at the first harvest of each season. Absolute contents per unit planting area were calculated by integrating compound concentrations, plant biomass, and planting density. Winter-grown plants showed significantly higher TPC, TFC, and TAC than plants grown in other seasons (P < 0.05), whereas relatively lower values were observed during summer and autumn. Across all seasons, leaves consistently contained higher levels of phenolic compounds than stems. On a per-area basis, winter leaf TPC, TFC, and TAC were approximately 4.9-, 5.6-, and 6.5-fold higher than those in stems, respectively. However, per-area accumulation reflects overall production performance and does not solely represent tissue-level concentration. Canonical correlation analysis (CCorA) suggested that meteorological factors, particularly temperature and solar radiation-related variables, may be associated with seasonal variation in phenolic compound accumulation. Principal component analysis (PCA), used as an exploratory visualization tool rather than a direct statistical test of seasonal differences, illustrated seasonal separation patterns in leaf phenolic composition. In the PCA ordination, TPC and TAC tended to be associated with winter conditions, whereas TFC showed a closer association with summer conditions. Additional CCorA results, together with exploratory PCA visualization, suggested that plant nutrient element composition, particularly nitrogen, magnesium, and calcium, may be related to variation in phenolic compounds. Calcium content tended to be associated with winter conditions and TAC accumulation. Overall, these findings suggest that cultivation season, environmental conditions, and plant nutrient status may be associated with phenolic compound accumulation in purple leafy sweet potato. Given that this study was conducted over a single year across four cultivation seasons, further multi-year observations or controlled-environment experiments are required to validate these findings.
本研究探討紫色葉菜甘藷 (Ipomoea batatas “CYY84–67”) 於臺灣田間栽培條件下，不同栽培季節對其酚類化合物與植體營養元素組成之影響。本試驗於 2017–2018 年間進行，涵蓋春、夏、秋、冬四個栽培季節之定植，並於各栽培季節之第一次採收時，分別分析葉片與莖部之總酚類 (total phenolic content; TPC)、總類黃酮 (total flavonoid content; TFC) 及總花青素 (total anthocyanin content; TAC) 含量。單位面積累積量係結合成分濃度、植株生物量及栽植密度換算而得。結果顯示，冬季栽培之紫色葉菜甘藷其 TPC、TFC 及 TAC 顯著高於其他季節 (P < 0.05) ，而夏季與秋季則相對較低。各季節中，葉片之酚類化合物含量皆高於莖部。以單位面積累積量計算，冬季葉片之 TPC、TFC 及 TAC 分別約為莖部的 4.9、5.6 及 6.5 倍。然而，單位面積累積量主要反映整體生產效益，並不完全代表組織內成分濃度差異。典型相關分析 (canonical correlation analysis; CCorA) 顯示，溫度與太陽輻射等氣象因子可能與酚類化合物累積之季節性變化有關。主成分分析 (principal component analysis; PCA) 僅作為探索性視覺化工具，而非直接檢定季節差異之統計方法，其結果顯示葉片酚類化合物組成具有明顯之季節性分布趨勢，其中 TPC 與 TAC 較傾向與冬季條件相關，而 TFC 則較傾向與夏季相關。此外，CCorA 結果與 PCA 探索性分析亦顯示，氮、鎂及鈣等植體營養元素可能與酚類化合物變化有關，其中鈣含量較傾向與冬季條件及 TAC 累積相關。整體而言，本研究結果顯示，栽培季節、環境條件及植體營養狀態可能與紫色葉菜甘藷酚類化合物累積有關。由於本研究僅涵蓋單一年份之四個栽培季節，相關結果仍需透過多年期觀測或控制環境試驗進一步驗證。
Subjects
Purple leafy sweet potato
Cultivation season
Phenolic compounds
Plant nutrient element composition
紫色葉菜甘藷
栽培季節
酚類化合物
花青素
植體營養元素
Publisher
農業部農業試驗所
Type
journal article
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