Alterations in Source-Sink Relations Affect Rice Yield Response to Elevated CO₂: A Free-Air CO₂ Enrichment Study.

ABSTRACT: To understand the effects of source-sink relationships on rice yield response to elevated CO₂ levels (eCO₂), we conducted a field study using a popular japonica cultivar grown in a free-air CO₂ enrichment environment in 2017-2018. The source-sink ratio of rice was set artificially via source-sink treatments (SSTs) at the heading stage. Five SSTs were performed in 2017 (EXP1): cutting off the flag leaf (LC1) and the top three functional leaves (LC3), removing one branch in every three branches of a panicle (SR1/3) and one branch in every two branches of a panicle (SR1/2), and the control (CK) without any leaf cutting or spikelet removal. The eCO₂ significantly increased grain yield by 15.7% on average over all treatments; it significantly i

SUBMITTER: Gao B 

PROVIDER: S-EPMC8283783 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature