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Effects of exogenous cytokinin on photosynthesis, senescence, and yield performance of inferior rice tillers grown under different nitrogen regimes.
- Source :
- Photosynthetica; 2020, Vol. 58 Issue 1, p137-145, 9p
- Publication Year :
- 2020
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03003604
- Volume :
- 58
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Photosynthetica
- Publication Type :
- Academic Journal
- Accession number :
- 144608722
- Full Text :
- https://doi.org/10.32615/ps.2019.170