Work

Effects of exogenous cytokinin on photosynthesis, senescence, and yield performance of inferior rice tillers grown under different nitrogen regimes

Year: 2020

Type: article

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.

Source: Photosynthetica

DOI: 10.32615/ps.2019.170

Authors: Y. WANG, J.W. LU, T. REN, P.F. LI, Q.X. LIU, X.K. LI

Institution: Huazhong Agricultural University

Language: English

Topic: Rice Cultivation and Yield Improvement

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: gold

Estimated APC paid: $3,140