Effects of exogenous cytokinin on photosynthesis, senescence, and yield performance of inferior rice tillers grown under different nitrogen regimes
| Autor: | J.W. Lu, Q.X. Liu, P.F. Li, X.K. Li, Yong Wang, T. Ren |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Senescence antioxidant enzyme Physiology Tiller (botany) Plant Science Photosynthesis 01 natural sciences nitrogen harvest index chemistry.chemical_compound lcsh:Botany biology distribution of light energy yield potential 04 agricultural and veterinary sciences Malondialdehyde lcsh:QK1-989 Chloroplast Horticulture chemistry Catalase Cytokinin 040103 agronomy & agriculture biology.protein 0401 agriculture forestry and fisheries 010606 plant biology & botany Peroxidase |
| Zdroj: | Photosynthetica, Vol 58, Iss 1, Pp 137-145 (2020) |
| ISSN: | 1573-9058 0300-3604 |
| DOI: | 10.32615/ps.2019.170 |
| Popis: | Inferior tillers contribute negligibly to rice grain yields as their late occurrence or prematurity curtails growth. However, 6-benzylaminopurine (6-BA, a synthetic cytokinin) can delay tiller senescence. Our results indicate that foliar application of 6-BA enhanced the distribution and allocation of light energy for the photochemical reactions of PSII, under appropriate N supply. The percentage of thermal energy dissipation also decreased following the application of 6-BA as a consequence of the reduced risk of chloroplast oxidative damage through excess excitations. Moreover, leaf peroxidase, catalase, and ascorbate peroxidase activities were augmented by adding 6-BA, which significantly inhibited the accumulation of malondialdehyde and H2O2. The application of 6-BA increased the grain numbers of the inferior tillers and further enhanced tiller yields under 82.5 and 165 kg(N) ha-1 supply. The effect of 6-BA was negligible for the untreated or excessive N-treated plants. |
| Databáze: | OpenAIRE |
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