Improving physiological N-use efficiency by increasing harvest index in rice: a case in super-hybrid cultivar Guiliangyou 2. Issue 5 (3rd May 2016)

• Record Type: Journal Article
• Authors: Huang, Min; Chen, Jiana; Cao, Fangbo; Jiang, Ligeng; Zou, Yingbin; Deng, Guofu
• Is Part Of: Archives of agronomy and soil science. Volume 62:Issue 5(2016)
• Page Start: 725
• Page End: 743
• Publication Date: 2016-05-03
• Subjects: harvest index -- physiological N-use efficiency -- remobilization of stored reserves -- super-hybrid rice; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2015.1082031
• Languages: English
• ISSNs: 0365-0340

Abstract

Abstract : Field experiments were conducted in 2013 and 2014 to compare grain yield, yield attributes and physiological N-use efficiency between two super-hybrid rice cultivars: (1) with the potential of high harvest index and physiological N-use efficiency (Guiliangyou 2) and (2) a representative super-hybrid rice cultivar (Y-liangyou 1). No significant difference in grain yield was observed between Guiliangyou 2 and Y-liangyou 1, whereas there were obvious differences in yield attributes between the two cultivars. Compared with Y-liangyou 1, Guiliangyou 2 had 8–10% lower biomass production but 14–18% higher harvest index. Consequently, physiological N-use efficiency was 18–20% higher in Guiliangyou 2 than in Y-liangyou 1. The higher harvest index in Guiliangyou 2 was mainly attributed to enhanced remobilization of stored reserves in the growing grain than in Y-liangyou 1. Larger panicle neck diameter and thinner leaves were partially responsible for the enhanced remobilization of stored reserves in Guiliangyou 2 as compared to Y-liangyou 1. Our results suggest that Guiliangyou 2 is a unique super-hybrid rice cultivar that achieves high grain yield by increasing harvest index and N-use efficiency.