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自然条件下中熟籼稻初穗期剑叶光合的气孔和非气孔限制特征

叶子飘1,郑卓2,康华靖3,王复标1,安婷1,段世华2*   

  1. (1井冈山大学数理学院, 江西吉安 343009;  2井冈山大学生命科学学院, 江西吉安 343009; 3温州市农业科学研究院, 浙江温州 325006)
  • 出版日期:2019-04-10 发布日期:2019-04-10

Stomatal and non-stomatal limitations on photosynthesis of flag leaf of medium mature indica rice at early earring stage under natural conditions.

YE Zi-piao1, ZHENG Zhou2, KANG Hua-jing3, WANG Fu-biao1, AN Ting1, DUAN Shi-hua2*   

  1. (1College of Math and Physics, Jinggangshan University, Ji’an 343009, Jiangxi, China; 2School of Life Sciences, Jinggangshan University, Ji’an 343009, Jiangxi, China; 3Wenzhou Academy of Agricultural Sciences, Wenzhou 325006, Zhejiang, China).
  • Online:2019-04-10 Published:2019-04-10

摘要: 为探究自然条件下中熟籼稻初穗期剑叶光合作用的气孔与非气孔限制特征,利用LI-6400光合仪测定了4个水稻品种(恢复系R7-35,不育系井大3S,杂交F1代井大3S/R735和对照品种9311)的气体交换数据,获得了它们的净光合速率、气孔导度、胞间CO2浓度和气孔限制值对光的响应曲线。结果表明:与最大净光合速率相对应的饱和光强(Isat)分别为1500、1800、1200和1200 μmol·m-2·s-1;除井大3S/R7-35外,其他3个水稻品种的气孔导度随光强的增加而非线性增加,由此可知,在较高光强处限制这4个水稻叶片光合作用的因素是非气孔限制。与最小胞间CO2浓度(Ci)相对应的光强分别为1600、1600、1400和1600 μmol·m-2·s-1,与最大气孔限制值(Ls)相对应的饱和光强分别为1400、1200、1400和600 μmol·m-2·s-1。根据Ci降低和Ls升高作为判断叶片光合速率降低的主要原因是气孔因素的判据标准,品种9311则在光强小于1600 μmol·m-2·s-1时,Ci随光强的增加而降低,在光强小于600 μmol·m-2·s-1时,Ls随光强的增加而升高,但该品种在光强小于1200 μmol·m-2·s-1时,其光合能力随光强的增加而非线性增加。这个结果与以Ci降低和Ls升高作为判断准则相互矛盾。为此,提出用植物叶片是否存在Isat作为判断光合速率下降的非气孔限制因素准则,用气孔导度是否存在最大值作为植物叶片的气孔限制因素准则。

关键词: 海坛岛, 土地利用, 生态风险, 探索性空间数据分析(ESDA)

Abstract: This study aims to explore the characteristics of stomatal and non-stomatal limitations on photosynthesis of flag leaves of medium mature indica rice (Oryza sativa) under natural conditions in Jiangxi. Leaf gas exchange of four rice cultivars (i.e.restorer line R7-35, sterile line Jingda 3S, F1 hybrid of Jingda 3S/R7-35, and CK 9311) at the early earring stage were examined using a LI-6400 portable photosynthesis analyzer. The light-response curves of net assimilation rate (An), stomatal conductance (gs), intercellular CO2 concentration (Ci) and stomatal limitation value (Ls) were measured. The results showed that the saturated light intensity (Isat) values, corresponding to the maximum An, for the four cultivars were 1500, 1800, 1200, and 1200 μmol·m-2·s-1, respectively. The gs of R7-35, Jingda 3S and 9311 increased with the increases of light intensity (I). At higher I levels, non-stomatal limitation played a major role in limiting An of the four cultivars. The I values corresponding to the minimum Ci were 1600, 1600, 1400, and 1600 μmol·m-2·s-1, respectively. The saturation I values corresponding to the maximum Ls were 1400, 1200, 1400, and 600 μmol·m-2·s-1, respectively. If the decrease ofCi and the increase of Ls were the main reasons for the decreases of photosynthetic rate, the criterion of stomatal factor would be biased. Cultivar 9311 showed a decrease ofCi with the increases ofI until reaching 1600 μmol·m-2·s-1, an increase of Ls with the increases of I until reaching 600 μmol·m-2·s-1, and a nonlinear increase ofAn with the increases of I until reaching 1200 μmol·m-2·s-1. These results indicated that a combination of Ci decrease and ofLs increase would not necessarily lead to a decrease in An. Accordingly, we propose a new criterion for determining non-stomatal limitation whether it had Isat and for determining stomatal limitation whether it had the maximum gs.

Key words: Haitan Island, land use, ecological risk, exploratory spatial data analysis (ESDA).