Abstract
Translocation of biomass produced during pre-heading to grains is a determinant of grain yield, but also plays an important role in adaptation to unfavorable environments during post-heading in rice. In this study, field experiments were conducted to determine the critical factors that regulate biomass translocation in rice. Biomass translocation and production characteristics of two rice hybrids (Guiliangyou 2 and Y-liangyou 1) were compared between two site-year environments (Naning-2014 and Yongan-2018). Results showed that biomass translocation parameters (biomass translocation amount and rate and contribution of biomass translocation to filled grain weight) and ratio of biomass production during pre-heading to post-heading (BPpre/BPpost ratio) decreased in Guiliangyou 2 but increased in Y-liangyou 1 with the environment change from Nanning-2014 to Yongan-2018. The decreased BPpre/BPpost in Guiliangyou 2 was attributable to increased biomass production during post-heading (BPpost), while the increased BPpre/BPpost ratio in Y-liangyou 1 was due to increased biomass production during pre-heading (BPpre). Higher cumulative incident solar radiation and larger diurnal temperature variation were responsible for the increased BPpost in Guiliangyou 2 and the increased BPpre in Y-liangyou 1 grown in Yongan in 2018 compared to in Nanning in 2014. The results of this study indicate that changes in biomass translocation and production with environment (climate) in rice are dependent on genotype and that the BPpre/BPpost ratio is an important factor regulating biomass translocation in rice.
Highlights
Rice is important for world food security in that it is the staple food for more than half of the global population [1]
Considerable differences in climatic conditions including temperature and solar radiation existed between the two tested rice-growing environments; the differences are consistent with those observed in adjacent regions in previous studies [18, 19]
The two tested rice hybrids had similar responses to the environmental variation in term of filled grain weight, their responses for biomass translocation were contrasting. This finding indicates that there may not be a single relationship between grain yield and biomass translocation in rice
Summary
Rice is important for world food security in that it is the staple food for more than half of the global population [1]. Increasing yield has been, and probably will remain, the chief objective in rice production, improving yield stability (i.e., the ability of a crop to maintain yield performance across diverse environments) is a primary objective [6, 7, 8]. This objective has become more and more important because of climate change, which may result in increased intensity and frequency of extreme weather events in the future [9, 10, 11]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
