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植物研究 ›› 2000, Vol. 20 ›› Issue (2): 180-185.

• 论文 • 上一篇    下一篇

根系温度对苋菜生长及光合特性的影响

冯玉龙1, 姜淑梅1, 邵侠2   

  1. 1. 河北大学, 保定 071002;
    2. 大庆石油管理局农工商联合公司园林大队;大庆 163000
  • 收稿日期:1999-01-17 出版日期:2000-06-15 发布日期:2016-06-14

THE EFFECT OF ROOT SYSTEM TEMPERATURE ON GROWTH AND PHOTOSYNTHE TIC CHARATERISTICS IN AMARANTHUS TRICOLOR

FENG Yu-long1, JIANG Shu-mei1, SHAO Xia2   

  1. 1. Hebei University, Baoding 071002;
    2. Landscape Unit of Agriculture. Industry and Trade Compang of Daqing Petroleum Administrative Bureau 163000
  • Received:1999-01-17 Online:2000-06-15 Published:2016-06-14

摘要: 气候室中研究了根温对苋菜幼苗生长及光合等生理特性的影响。结果表明,苋菜幼苗生长曲线呈S形, 30d苗龄时生长最快, 40d苗龄时每株干、鲜重分别为0.45g和6.79g。20~25℃根温时40d苗龄苋菜生长最快,高根温对生长的危害大于低根温, 40℃根温苋菜根系生长、代谢受害严重。苋菜净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Cs)和胞间CO2分压(Pi)随根温的变化趋势基本一致, 20~25℃根温时,Cs、Pi、Pn和Tr均高,不良根温影响了Cs,使Tr降低, Pi降低,进而影响到Pn。回归分析表明, Pn与Cs、Pn与Pi、Tr与Cs、Pi与Cs均呈显著正相关。说明Cs下降是不良根温影响Pn的主要原因。

关键词: 苋菜, 根温, 生长, 光合特性

Abstract: The effect of root temperature on growth, photosynthetic and other physiological characteristics of A. tricolor seedlings were studied in phytotron. The result showed that growth curve of A. tricolor seedling presented "S" shape, 30-day-old seedling grew fastest. Dry and fresh weight per a seedling was 0.45g and 6.79g respectively. The harmfulness of superoptimum root temperature to growth was bigger than that of suboptimum root temperature, 40℃ root temperature harmed growth and metabolism of root system of A. tricolor seriously. The variation of net photosynthetic rate (Pn), transpirat ion rate(Tr), stomatal conductance(Cs), and intercellular CO2 partial pressure (Pi) with root temperature was similar in A. tricolor. Cs, Pi, Pn and Tr were higher at 20~25℃ root temperature. Suboptimum or superoptimum root temperature affected Cs, and caused decreasement of Tr and Pi, then affected Pn. Regressive analysis showed that Pn correlated with Cs and Pi positively, Tr and Pi correlated with Cs positively too. The main cause of the decreasement of Pn at suboptimum and superoptimum root temperature was the decreasement of Cs.

Key words: Amaranthus tricolor L., Root temperature, Grow th, Photosynthetic characteristics