Source-Sink Relationship during Grain Filling in Response to Leaf-cutting Treatment for Heavy Panicle Rice Cultivars

doi:10.3969/j.issn.1000-6362.2020.04.004

Abstract

Abstract: Field experiments were performed with two heavy panicle rice cultivars (BL006, R-nongbai) with different sowing dates in 2015. After leaf-cutting treatment, grain filling characteristics, leaf soluble sugar content, non-structural carbohydrate (NSC) content in stem and sheath were determined to investigate source-sink relationship during grain filling period. The results showed that: (1) under leaf-cutting treatment, 1000-grain weight was reduced by 24.34% in BL006 and 7.86% in R-nongbai compared with control; 1000-grain weights of different branches were significantly reduced for BL006, while only those of upper secondary branches in R-nongbai were significantly reduced; Both cultivars had a lower grain filling rate, and the time reaching highest grain filling rate and entire grain filling duration were shortened. (2) Leaf-cutting treatment resulted in the decrease in soluble sugar contents of the remaining leaves for both BL006 and R-nongbai, but leaf soluble sugar contents during the initial stage were significantly increased by 40.59% for R-nongbai in comparison with control. (3) NSC contents of stem and sheath were significantly reduced by leaf-cutting treatment and weren’t accumulated at earlier filling stage, and NSCs of R-nongbai were pre-translocated from full heading stage; Translocations of NSC from stem and sheath to grain (TNSC) were decreased by 23.32% in BL006 and 27.41% in R-nongbai, but translocation rates (TRNSC) were increased by 6.93% in BL006 and 18.88% in R-nongbai; Contribution rate of NSC to grain (CNSC) of R-nongbai were reduced by 2.14%. These results indicated that leaf-cutting treatment led to higher ratio of sink to source (grain-leaf ratio), and both translocations of leaves soluble sugar contents and TNSC were increased; However, these couldn’t compensate inadequate source, resulting in lower grain filling rate, shortened grain filling duration(especially the period with high filling rate) and lower 1000-grain weight. Expanding sink capacity can coordinate “source-flow-sink” and explore high yield potential of heavy panicle rice cultivar R-nongbai, that promotes high-stable yielding of heavy panicle rice cultivars.

Key words: 1000-grain weight, Grain filling, Non-structural carbohydrate, Source-sink relationship, High and stable yield

CLC Number:

CHEN Jian-zhen, YAN Hao-liang, YANG Qian-yu, TIAN Xiao-hai. Source-Sink Relationship during Grain Filling in Response to Leaf-cutting Treatment for Heavy Panicle Rice Cultivars [J]. Chinese Journal of Agrometeorology, 2020, 41(04): 222-229.

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