Source-flow-sink Characteristics of Heavy Panicle Rice BL006 and R-nongbai

doi:10.3969/j.issn.1000-6362.2019.09.003

Abstract

Abstract: Field experiment was conducted with two heavy panicle rice cultivars (BL006, R-nongbai) and one medium panicle rice cultivar (Huanghuazhan). Grain filling characteristics, dry matter accumulation, non-structural carbohydrate (NSC) content in stem-sheath, vascular bundle characters and yield traits were investigated to elucidate characteristics of grain filling and source-flow-sink for heavy panicle rice cultivars. Results showed that: (1) heavy panicle rice cultivars showed earlier grain growth, higher grain filling rate at early grain filling stage, heavier grain weight, and synchronous filling dynamic among spikelets on the different positions. (2) Compared with Huanghuazhan, spikelets per panicle and 1000-grain weights of BL006 and R-nongbai were increased by 16.83%, 33.75% and 13.19%, 10.07%, but filled-grain percentages were not significantly influenced, and effective panicles per hill of the two cultivars and spikelet fertility of R-nongbai were significantly decreased by 39.48%, 31.24% and 10.78%, respectively. Dry matter accumulation was increased by 36.06% in BL006 during the growth stage and 6.59% in R-nongbai after full heading, and NSC contents in stem-sheath were increased by 99.03% and 70.32%, and better vascular bundle characters of panicle neck and branches were observed as well. In a conclusion, heavy panicle rice cultivars BL006 and R-nongbai showed higher grain filling rate, shorter grain filling duration and heavier grain weight, and BL006 showed higher spikelet fertility and superior grain filling than R-nongbai. During grain filling, the two heavy panicle rice cultivars had sufficient source and unobstructed flow, and good grain filling was achieved by reducing appropriately effective panicle per hill. It laid the foundation for exploring the characteristics of grain filling and regulation mechanism of heavy panicle rice cultivars.

Key words: Large panicle rice, Grain filling, Source-flow-sink, Dry matter accumulation, Effective panicle

CHEN Jian-zhen, YAN Hao-liang, LIU Ke, ZHU Kai-dian, TIAN Xiao-hai. Source-flow-sink Characteristics of Heavy Panicle Rice BL006 and R-nongbai[J]. Chinese Journal of Agrometeorology, 2019, 40(09): 574-582.

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