Author:
Xie Anqi,Lv Mengwen,Zhang Dongliang,Shi Yajie,Yang Lijin,Yang Xiao,Du Jie,Sun Limin,Sun Xia
Abstract
AbstractHerbaceous peony is a perennial root plant that likes light and is cold-resistant. During summer, high temperature and strong light intensity advance its entry into the leaf wilting stage, which limits the accumulation of nutrients and formation of strong buds and severely affects its growth and development the following year. In this study, the wild herbaceous peony species and two main cultivars, ‘Zifengyu’ and ‘Hongfengyu’, were subjected to slight shading and strong light environments in summer, and their effects on leaf senescence and endogenous hormone and polyamine contents were explored. Slight shading treatment significantly delayed withering, increased the leaf net photosynthetic rate, and increased the chlorophyll, soluble sugar, indole-3-acetic acid, zeatin, gibberellin, spermine, spermidine, putrescine, and polyamine contents. Additionally, slight shading significantly reduced the proline and abscisic acid contents. Slight shading during summer prolonged the green period and delayed leaf senescence. The tolerance of tested materials to strong light intensity in summer was ranked as follows: ‘Zifengyu’ > ‘Hongfengyu’ > wild species. In conclusion, this study revealed that summer leaf senescence is delayed in herbaceous peony through shading and growth regulators. Additional varieties should be evaluated to provide reference for high-efficiency, high-quality, and high-yield cultivation of herbaceous peony.
Funder
the National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Reference42 articles.
1. Deng, Y. M., Li, C. C., Shao, Q. S., Ye, X. Q. & She, J. M. Differential responses of double petal and multi petal jasmine to shading: I. Photosynthetic characteristics and chloroplast ultrastructure. Plant Physiol. Bioch. 55, 93–102 (2012).
2. Du, J. et al. Study on photosynthetic mechanism of summer shading slowing aging of herbaceous peony (Paeonia lactiflora) leaves. Plant Physiol J. 54, 773–782 (2018) (in Chinese).
3. Wojciechowska, N., Sobieszczuk-Nowicka, E. & Bagniewska-Zadworna, A. Plant organ senescence—Regulation by manifold pathways. Plant Biol. (Stuttg.) 20, 167–181 (2018).
4. Guo, Y. & Gan, S. S. AtMYB2 regulates whole plant senescence by inhibiting cytokinin-mediated branching at late stages of development in Arabidopsis. Plant Physiol. 156, 1612–1619 (2011).
5. Hou, K., Wu, W. & Gan, S. S. SAUR36, a small auxin up RNA gene, Is involved in the promotion of leaf senescence in Arabidopsis. Plant Physiol. 161, 1002–1009 (2013).