Identification of Photosynthetic Parameters for Superior Yield of Two Super Hybrid Rice Varieties: A Cross-scale Study from Leaf to Canopy

Overview

Journal Front Plant Sci

Date 2023 Mar 3

PMID 36866365

Authors

Yonghui Pan

Yiwen Cao

Yixiao Chai

Xusheng Meng

Min Wang

Guanjun Wang

Shiwei Guo

Affiliations

Soon will be listed here.

Abstract

Enhancing photosynthetic capacity is widely accepted as critical to advancing crop yield. Therefore, identifying photosynthetic parameters positively related to biomass accumulation in elite cultivars is the major focus of current rice research. In this work, we assessed leaf photosynthetic performance, canopy photosynthesis, and yield attributes of super hybrid rice cultivars Y-liangyou 3218 (YLY3218) and Y-liangyou 5867 (YLY5867) at tillering stage and flowering stage, using inbred super rice cultivars Zhendao11(ZD11) and Nanjing 9108 (NJ9108) as control. A diurnal canopy photosynthesis model was applied to estimate the influence of key environmental factors, canopy attributes, and canopy nitrogen status on daily aboveground biomass increment (AM). Results showed that primarily the light-saturated photosynthetic rate at tillering stage contributed to the advancing yield and biomass of super hybrid rice in comparison to inbred super rice, and the light-saturated photosynthetic rate between them was similar at flowering stage. At tillering stage, the higher CO diffusion capacity, together with higher biochemical capacity (i.e., maximum carboxylation rate of Rubisco, maximum electron transport rate ( ), and triose phosphate utilization rate) favored leaf photosynthesis of super hybrid rice. Similarly, AM in super hybrid rice was higher than inbred super rice at tillering stage, and comparable at flowering stage partially due to increased canopy nitrogen concentration (SLN) of inbred super rice. At tillering stage, model simulation revealed that replacement of and in inbred super rice by super hybrid rice always had a positive effect on AM, and the averaged AM increment was 5.7% and 3.4%, respectively. Simultaneously, the 20% enhancement of total canopy nitrogen concentration through the improvement of SLN (TNC-SLN) resulted in the highest AM across cultivars, with an average increase of 11.2%. In conclusion, the advancing yield performance of YLY3218 and YLY5867 was due to the higher and at tillering stage, and TCN-SLN is a promising target for future super rice breeding programs.

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