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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (1): 166-170.doi: 10.11924/j.issn.1000-6850.2011-2396

所属专题： 园艺

• 林学 园艺 园林 • 上一篇    下一篇

中华苦荬菜光合作用及与环境因子的关系研究

韩忠明 李存勇 王璐璐 刘翠晶 韩梅 杨利民   

  • 收稿日期:2011-08-17 修回日期:2011-11-01 出版日期:2012-01-05 发布日期:2012-01-05
  • 基金资助:

    国家自然科学基金;吉林农业大学博士启动基金

Photosynthesis and Relationships with Environmental Factors of Ixeris chinensis

  • Received:2011-08-17 Revised:2011-11-01 Online:2012-01-05 Published:2012-01-05

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摘要：

为研究中华苦卖菜光合特性与环境因子关系，采用TPS-1便携式光合作用系统，测定自然条件下中华苦卖菜叶片光合特性、光合有效辐射（PAR）、大气二氧化碳浓度（Ca）、气温（Ta）、叶温（Tl）和相对湿度（RH）等环境因子。结果表明：中华苦卖菜净光合速率日变化呈明显的双峰曲线，峰值出现在10:00和14:00，分别为为9.26和4.17 μmol/(m2?s)，具有明显的光合“午休”现象，中华苦卖菜净光合速率中午降低为气孔限制；蒸腾速率日变化呈单峰曲线，峰值出现在10:00，为3.52 mmol/(m2?s)，气孔导度与水分利用效率日变化呈双峰曲线，峰值出现在10:00和14:00；环境因子中对Pn直接作用由大到小为TL>PAR>Ta>Ca>RH，中华苦卖菜Pn与PAR、RH呈显著正相关，与Ta、TL呈负相关。在中华苦卖菜叶片进行气体交换的日进程中，环境因子对中华苦卖菜同光合生理参数的影响程度不尽相同。总体而言，光合有效辐射、空气温度和空气相对湿度是影响中华苦卖菜光合气体交换的主要环境因子。

关键词: 栽培方式, 栽培方式, 粳型巨胚稻, 产量, 品质

Abstract:

To study the photosynthesis and its relationships with environmental factors of Ixeris chinensis (Thunb.) Nakai, photosynthetic characteristics of I. chinensis and photosynthetic active radiation (PAR), atmospheric CO2 concentration (Ca), ambient temperature (Ta), leaf temperature (Tl) and relative humidity (RH) were measured by TPS-1. Result showed: diurnal variation of net photosynthetic rate of I. chinensis could be expressed as two-hump curves, reflecting an obvious middy depression at noon, and the maximum values that appeared at 10:00 and 14:00 were 9.26 and 4.17 μmol/(m2?s), respectively, the stomatal limitations were responsible for photosynthetic decline of I. chinensis in the midday; the diurnal variation of transpiration rate was single peak curve, and the maximum value that appeared at 10:00 was 3.52 mmol/(m2?s), the variations of stomatal conductance and water use efficiency were two-hump curves with the peaks appeared at 10:00 and 14:00; the direct effects of environmental factors to Pn were the order of TL>PAR>Ta>Ca>RH, there was a significantly and positively correlation between the Pn and PAR, RH (P<0.05), and negative correlation with Ta and TL. In the diurnal dynamics of gas exchange, effects of environmental factors on photosynthetic physiological parameters of I. chinensis were different. In a word, PAR, Ta and RH were main environmental factors to influence photosynthetic gas exchange of I. chinensis.

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