Chinese Journal of Rice Science

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Energy Cost for Growth, Ion Uptake and Maintenance of Hybrid Rice Ganhua 7

SHI Qing-hua 1; Ries de VISSER 2   

  1. (1Agricultural College; Jiangxi Agricultural University; Nanchang 330045; China; 2 DLO Research Institute for Agrobiology and Soil Fertility; P. O. Box 14; NL 6700 AA; Wageningen; The Netherlands)
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-07-10 Published:2001-07-10

杂交水稻赣化7号的植株生长、离子吸收和维持呼吸的能量消耗

石庆华1; Ries de VISSER 2   

  1. 1江西农业大学 农学院,江西 南昌 330045;E-mail:shiqh@public.nc.jx.cn; 2 荷兰农业生物和土壤肥料研究所,荷兰 瓦赫宁恩14信箱

Abstract: Respiratory energy costs for growth, ion uptake and maintenance were determined on roots of hybrid rice, Ganhua 7 and one of its parents Guangkangjing 2. These three components of respiration were determined by two approaches: (i) multiple regression of root respiration on relative growth rate (RGR) and ion uptake rate under plant growth conditions, and (ii) comparison of root respiration and ion uptake in the absence and presence of mineral ions in the root medium. The results obtained by both methods are consistent. On average, roots of the fast growing F1 hybrid showed a 60% higher RGR, a 24% higher rate of O2 uptake, and a 16% higher rate of ATP production than roots of the parent having the same dry weight. The root growth respiration coefficient (1/Y) of the F1 hybrid was 26 mmol/g dry weight, about 45% lower than that in the parent. The maintenance coefficients and the energy requirements for anion uptake were not significantly different between the hybrid and its parent.

Key words: hybrid rice, root growth, ion uptake, maintenance

摘要: 对杂交水稻赣化7号及其亲本之一的广抗粳2号的根系生长、离子吸收和维持呼吸所需的能量消耗进行了研究。通过两种方法来决定根系三个部分的能量消耗:1)在生长状况下根系呼吸耗氧和相对生长率、离子吸收率的多元回归分析;2)通过水稻根系在营养液和去离子水中的耗氧差来决定根系吸收离子所需的能量,两种方法分析取得的结果基本一致。杂交水稻赣化7号的平均相对生长率比亲本高60%,耗氧多24%,ATP生产量多16%。赣化7号的根系生长耗能系数(1/Y)是26 mmol/g,比其亲本少45%。赣化7号与其亲本的离子吸收耗能和维持呼吸耗能系数的差异不显著。

关键词: 杂交水稻, 根系生长, 离子吸收, 维持呼吸