Improving crucial details and selecting the optimal model for evaluating the chilling requirement of Paeonia lactiflora Pall. at low latitudes during four winters
Improving crucial details and selecting the optimal model for evaluating the chilling requirement of Paeonia lactiflora Pall. at low latitudes during four winters
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DOI：
10.1016/j.scienta.2020.109175
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发表时间：
2020-04
影响因子：
4.3
通讯作者：
Xiaobin Wang;Danqing Li;Dong Zhang;Xiaohua Shi;Yun Wu;Zhenyu Qi;Huaqiao Ding;Kaiyuan Zhu
中科院分区：
文献类型：
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作者：
Xiaobin Wang;Danqing Li;Dong Zhang;Xiaohua Shi;Yun Wu;Zhenyu Qi;Huaqiao Ding;Kaiyuan Zhu
由于全球变暖的加剧，在暖冬气候下，无数的多年生植物面临着与低温积累不足和休眠释放障碍相关的严重问题。这些问题阻碍了这些植物在低纬度地区的生长能力，从而降低了它们的经济价值。“芍药南种”（Paeonia lactifloraPall.）是促进温带植物向亚热带甚至热带地区扩展的典型例子。评价芍药品种的低温需要量，选育具有较强低温需要量的芍药新品种，对低纬度地区芍药栽培和推广具有重要意义。在本研究中，对最南端栽培的中国牡丹“杭白芍”进行了自然和控制冷却处理，并在三个冬季进行了CR评价。明确了评价的开始时间和企业社会责任履行的评价标准，然后运用5个模型对“杭百少”企业社会责任进行了评价。根据3年CR值的稳定性、3年CR区间重叠的有效性以及CR值与形态数据的相关性，确定犹他（Utah）模型为最优模型，并将其应用于其他5个北方牡丹品种的评价。结果表明，“杭百少”和“七花芦双”是低CR的典型品种，“竹光”是高CR的典型品种，通过对“杭百少”和“竹光”第4个冬季的CR进行评价，进一步验证了UT模型的可靠性。本研究在多年观测、多处理试验、多细节定义和多品种验证的基础上，构建了低温贮藏的综合研究策略，为低纬度地区经济植物冬休眠研究提供了新的视角。
The countless perennial plants face severe problems associated with insufficient chilling accumulation and obstacles to dormancy release in warm-winter climates as a result of increased global warming. These problems hinder the ability of these plants to grow in low-latitude regions and consequently reduce their economic values. “The southward planting of herbaceous peony” (Paeonia lactifloraPall.) is a representative example of promoting the expansion of temperate plants into subtropical and even tropical regions. Evaluating the chilling requirement (CR) of herbaceous peony and then selecting or breeding new cultivars that have substantial low-CR traits are important for peony cultivation and popularization at low latitudes. In this study, natural and controlled chilling treatments and CR evaluations were conducted for the southernmost cultivated Chinese peony, ‘Hang Baishao’, initially during three winters. The start times of the evaluations and the assessment criteria for the CR fulfillments were specifically defined, after which five models were used to evaluate the CR of ‘Hang Baishao’. According to the stability of the CR value during the three years, the availability of overlaps among the three-year CR ranges, and the correlations between the CR values and the morphological data, the Utah (UT) model was identified as the optimal model and was subsequently used to evaluate five other northern peony cultivars. The results indicate that ‘Hang Baishao’ and ‘Qihua Lushuang’ were representative cultivars with a low CR, while ‘Zhuguang’ represented a typical cultivar with a high CR. The dependability of the UT model was further confirmed by evaluating the CR of ‘Hang Baishao’ and ‘Zhuguang’ during a fourth winter. This study constitutes an integrated research strategy on CRs on the basis of multiyear observations, multi-treatment experiments, multi-detail definitions and multi-cultivar validations, and the results could provide new perspectives for studies on economic plants that undergo winter dormancy in low-latitude regions.