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首页> 外文期刊>The Kasetsart Journal >Photosynthetic Capacity and Effect of Drought on Leaf Gas Exchange in Two Rubber (Hevea brasiliensis) Clones
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Photosynthetic Capacity and Effect of Drought on Leaf Gas Exchange in Two Rubber (Hevea brasiliensis) Clones

机译：两种橡胶无性系的光合能力和干旱对叶片气体交换的影响

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摘要

Photosynthetic capacity, water-use efficiency and nitrogen-use efficiency were compared between two different rubber clones, PB 260 and PB 217. Plants were grown in 50 dm~3 pots in a greenhouse at Clermont-Ferrand, France under controlled condition. Net CO_2 assimilation rate at 1800 ppm CO_2 (A_(1800)) and at 360 ppm CO_2 (A_(360)), maximum carboxylation rate (V_(cmax)), electron transport capacity (J_(max)) and nitrogen-use efficiency (A_(1800)/N_a, A_(360)N_a, V_(cmax)/N_a and J_(max)/N_a) of clone PB 260 were significantly higher than those of clone PB 217. However, the dark respiration rate (R_d), the ratio of light-saturated rate of electron transport and maximum rate of carboxylation (J_(max)/V_(cmax))> leaf mass per area (M_a), leaf nitrogen content (N_m), leaf nitrogen per area (N_a), water use efficiency (WUE), SPAD value (SPAD) and chlorophyll fluorescence ratio (F_v/F_m) were non- significantly different between these clones. Effects of drought on leaf gas exchange rates was also studied. Net CO_2 assimilation rate (A), stomatal conductance (g_s) and transpiration rate (E) showed a declining curve as a function of increased water stress. WUE was high under severe stress, due to a more rapid decrease of £ than A. At 14 days after stress, g_s and E decreased by 80-85%, while A decreased by 60-70%. Drought also reduced leaf water potential, which was possitively related to stomatal conductance. These results confirmed the potential genotypic variability of some photosynthetic traits under non-water-limited condition and stomatal behavior related with hydraulic properties during water stress in rubber trees.
机译：比较了两个不同的橡胶克隆PB 260和PB 217之间的光合能力，水分利用效率和氮利用效率。将植物在受控条件下于法国Clermont-Ferrand的温室中的50 dm〜3盆中种植。 1800 ppm CO_2（A_（1800））和360 ppm CO_2（A_（360））时的净CO_2同化率，最大羧化率（V_（cmax）），电子传输能力（J_（max））和氮利用效率克隆PB 260的（A_（1800）/ N_a，A_（360）N_a，V_（cmax）/ N_a和J_（max）/ N_a）明显高于克隆PB 217的克隆。但是，暗呼吸速率（R_d ），电子传输的光饱和速率与最大羧化速率之比（J_（max）/ V_（cmax））>单位面积叶片质量（M_a），叶片氮含量（N_m），单位面积叶片氮（N_a ），这些克隆之间的水分利用效率（WUE），SPAD值（SPAD）和叶绿素荧光比（F_v / F_m）无显着差异。还研究了干旱对叶片气体交换率的影响。净CO_2同化率（A），气孔导度（g_s）和蒸腾速率（E）随水胁迫的增加呈下降趋势。在重度压力下，WUE较高，这是由于£比A下降得更快。在压力后14天，g_s和E下降了80-85％，而A下降了60-70％。干旱还降低了叶片的水势，这可能与气孔导度有关。这些结果证实了在非水分限制条件下某些光合性状的潜在基因型变异和与水分胁迫相关的橡胶树气孔特性与气孔行为有关。

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