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首页> 外文会议>Asia Pacific Rubber Conference >Responses of Chlorophyll Fluorescence, Stomatal Conductance, and Net Photosynthesis rates of Four Rubber (Hevea brasiliensis) Genotypes to Drought
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Responses of Chlorophyll Fluorescence, Stomatal Conductance, and Net Photosynthesis rates of Four Rubber (Hevea brasiliensis) Genotypes to Drought

机译：四种橡胶（HEVEA Brasiliensis）基因型对干旱的叶绿素荧光，气孔导度和净光合速​​率的反应

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This experiment aimed to evaluate the leaf chlorophyll fluorescence and gas exchange response to drought conditions of young rubber plants with different scions. Buds from four genotypes of a progeny derived from crossed clones of RRIM600 x RRII105 from Nongkhai Rubber Research Center, T187, T186, T149 and T172, were grafted to RRIM 600 rootstocks. Eight-month old plants with two flushes were used in this study. Two levels of water treatment were used, drought condition (W_1) and well-watered as control (Wo). Leaf chlorophyll fluorescence, stomatal conductance (g_s) and net photosynthesis rate (Pn) were investigated in three phases: before drought, during drought and after re-watering. Leaf gas exchange parameters were measured using Li-6400 (LiCor Inc.). Leaf chlorophyll fluorescence was measured using FluorPen FP 100 (Photon Systems Instruments). Before drought, genotype T186 had the greatest net photosynthesis rates followed by T172, T187 and T149; there was no difference in maximum quantum yield of photosystem II (F_v/F_m) and performance index on absorption basis (PI_(abs)). Drought conditions caused reduction in stomatal conductance, net photosynthesis rates, and leaf chlorophyll fluorescence in all genotypes. In re-watering conditions, genotype T186 and T172 experienced quick recovery while the others showed partial recovery but the values of all parameters did not reach previous levels before treatment.
机译：该实验旨在评估叶片叶绿素荧光和气体交换对不同间隙的幼苗植物的干旱状况。来自Nongkhai橡胶研究中心的RRIM600 X RRII105交叉克隆的四种基因型的芽，T187，T186，T149和T172嫁接到RRIM 600砧木。本研究使用了八个月的植物，两种冲洗植物。使用两种水平的水处理，干旱状况（W_1）和浇水作为对照（WO）。在三个阶段研究了叶片叶绿素，气孔导率（G_S）和净光合速​​率（PN）：在干旱期间，在干旱期间和再浇水后。使用Li-6400（Licor Inc.）测量叶片气体交换参数。使用Fluoupen FP 100（光子系统仪器）测量叶片叶绿素荧光。在干旱之前，基因型T186具有最大的净光合速率，然后是T172，T187和T149;在吸收基础上的最大照片II（F_V / F_M）和性能指数没有差异（PI_（ABS））。在所有基因型中导致气孔导度，净光合速率和叶绿素荧光引起的干旱状况。在重新浇水条件下，基因型T186和T172经历了快速恢复，而其他结果表明部分恢复，但在治疗前，所有参数的值都没有到达以前的水平。

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