Crop and Environment Research Center, College of Agronomy, Hunan Agricultural University, Changsha, China.
Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China.
PLoS One. 2019 Jul 31;14(7):e0220651. doi: 10.1371/journal.pone.0220651. eCollection 2019.
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.
抽穗前生物量向籽粒的转移是决定籽粒产量的一个因素，但在水稻抽穗后对不良环境的适应中也起着重要作用。本研究通过田间试验确定了调控水稻生物量转移的关键因素。在两个地点-年份环境（南宁 2014 年和永安 2018 年）下，比较了两个水稻杂交种（桂两优 2 号和甬优 1 号）的生物量转移和生产特性。结果表明，随着环境从南宁 2014 年到永安 2018 年的变化，桂两优 2 号的生物量转移参数（生物量转移量和速率以及生物量转移对充实粒重的贡献）和抽穗前到抽穗后生物量生产的比例（BPpre/BPpost 比值）降低，而甬优 1 号增加。桂两优 2 号 BPpre/BPpost 的降低归因于抽穗后生物量生产的增加（BPpost），而甬优 1 号 BPpre/BPpost 比值的增加则是由于抽穗前生物量生产的增加（BPpre）。较高的累计太阳辐射和较大的日温差导致 2018 年永安种植的桂两优 2 号 BPpost 和甬优 1 号 BPpre 增加，而 2014 年南宁种植的则减少。本研究结果表明，水稻生物量转移和生产对环境（气候）的变化取决于基因型，BPpre/BPpost 比值是调控水稻生物量转移的一个重要因素。
