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Acta Agron Sin ›› 2009, Vol. 35 ›› Issue (1): 140-148.doi: 10.3724/SP.J.1006.2009.00140

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Differences in Characteristics of Source,Sink,and Flow between Ratooning Rice and Its Same-Term Heading Main-Crop Rice

YI Zhen-Xie,ZHOU Wen-Xin,QIN Peng,TU Nai-Mei*   

  1. College of Agronomy,Hunan Agricultural University,Changsha 410128,China
  • Received:2008-03-24 Revised:2008-07-12 Online:2009-01-12 Published:2008-11-18
  • Contact: TU Nai-Mei E-mail:tnm505@163.com

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Abstract:

Many researches on characteristics of source and sink of ratooning rice (RR) and their differences with main-crop rice (MCR) have been conducted under natural growing conditions in different seasons. At the same time, while the difference in characteristics of flow between MCR and RR is seldom reported. To get rid of the effect of natural conditions, sowing on different dates was applied to make RR of earlier MCR and later MCR headed at the same time, and then differences in characteristics of source, sink and flow between RR and its same-term heading main-crop rice (SHMR) were studied with six rice cultivars. The results showed that LAI of RR was about one-eighth to one-fifth of that of SHMR, and grain number per panicle and yield of RR were about one-third of those of SHMR, while photosynthetic rate of RR was 20% to 70% higher than that of SHMR in 10 days after full heading and net assimilation rate of RR was 3.7 to 6 times of that of SHMR from booting to maturity. Difference in catalase activity of panicle branches between RR and SHMR was not clear. In photosynthate of flag leaves, the proportion distributed to panicles showed RR>SHMR, but the proportion remained in stems and sheathes showed the opposite trend. Appearance quality of RR was better than that of early rice and late rice, but its processing quality was between early rice and late rice. In the conditions of this study, SHMR belonged to the sink-limited while RR belonged to the source-sink interacted. The high-yielding strategies to RR were as follows: choose varieties with more grains, exert advantages of RR in higher photosynthetic rate and net assimilation rate, adopt positive cultivating measures to promote expanding of leaf area, at the same time, to increase grain number per panicle and boost up transporting capability of flow to a certain extent.

Key words: Ratooning rice, Main crop, Characteristics of source,sink,and flow, High-yielding

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